2478030000

**Powerful Circuit Protection** UL 489 and UL 1077 – AC/DC Rated Miniature Circuit Breakers 

Thermal Magnetic Miniature Circuit Breakers 

## **Introduction** Choose the Right Weidmuller Miniature Current Breaker (MCB) (Always refer to the NEC before installing any device.) 

When considering the UL 489 and UL 1077 Series MCBs, always assess the application for the following: voltage rating, maximum interrupting capacity, continuous current rating, frequency, and atypical operating conditions (ambient temperature, moisture, vibration, altitude, installation or operation orientation, and field maintenance). The MCBs are intended to protect the circuit cables as well as motors, generators and transformers, thyristors and silicon rectifiers. They also provide additional protection of computers and their peripheral equipment, industrial process control systems, telecommunications equipment and power supplies. 

## **Ask the following:** 

- Is the application an AC or DC circuit? 

   - Good news here, UL 489 and UL 1077 MCBs are rated for both AC and DC. 

- Is a branch or supplemental breaker needed for the application? Branch devices may be used in place of supplemental but not vise versa. 

- How many poles are needed for each circuit being protected? 3p – 3 phase no neutral, 2p – L1 and Neutral, 1p – L1 only. 

   - What are the functional requirements of the breaker? The UL 489 and UL 1077 are rail mountable, easy to visually inspect, switch manually (or remotely trip with shunt trip devices) and monitor using an auxiliary contact. Mechanically 20,000 cycles and electrically 6,000 cycles. 

   - What is the wire size used? Can the breaker accept the wire sizes required? The UL 489 and UL 1077  are designed for ≤35mm². 

- Calculate and/or measure the normal current for the circuit and follow NEC guidelines. Match the breaker amps based on the normal current load. Weidmuller’s MCB’s run 1 to 63 amps (See Technical Data on page 4). 

- Determine potential failure mode(s). The MCB thermal magnetic devices are designed for interrupt short-circuit and overload events. 

   - What are the environmental factors: ambient temperature, moisture, vibration? 

      - Check to determine if there are unusual conditions in which the breaker must operate. The UL 489 and UL 1077 are specified to IP20, -35°C ...70°C, and shock tested to IEC 60068-2-27. 

- What is the interrupt capacity (IC)? Specify the breaker knowing the maximum fault current that can be repeatedly interrupted without failure of the breaker. UL 489 and UL 1077  MCBs have a maximum current at a given voltage that the breaker can interrupt safely without damage to surrounding components. (See Technical Data) 

- What is the reaction time needed to a given fault condition? Specify a breaker by selecting a speed that avoids nuisance tripping but protects against component damage (B, C or D curve) 

**2** 

Thermal Magnetic Miniature Circuit Breakers 

## **Applications** 

- Automotive Manufacturing 

- Chemical, Oil and Gas 

- Renewable Energy 

- Rail Vehicles 

- Automation 

- Pharmaceutical and Food 

- Steel Production 

- Telecom and Datacom 

- Power-D-Box-Systems 

- Lighting Equipment 

- Process Control 

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OR SS el,<br>Pharmaceutical and Food Chemical, Oil and Gas<br>**----- End of picture text -----**<br>


## **Pharmaceutical and Food** 

**Automotive Manufacturing** 

**Rail Vehicles** 

**3** 

Thermal Magnetic Miniature Circuit Breakers 

## **Application Schematic** 

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G L1 L2 L3<br>**----- End of picture text -----**<br>


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Power Circuit<br>UL489<br>Bod<br>UL489<br>Power Circuit<br>UL489 Power<br>Transformer<br>Control Circuit<br>Control Transformer<br>UL489<br>Power<br>Transformer<br>UL1077<br>UL489<br>UL1077<br>UL489<br>UL489<br>UL1077<br>UL489<br>M M<br>a ll<br>Outlet Fixed mounted<br>cabinet/panel heater<br>(resistive loads)<br>**----- End of picture text -----**<br>


Sizing of main branch circuit protector according to table 430.52 in NEC[®] 

- **Dual Element (Time Delay) Fuse** Maximum fuse = largest motor FLA x 175% 

      - + FLA of all other motors and general loads in group 

- **Inverse Time Breaker** 

   - Maximum circuit breaker = largest motor FLA x 250% 

      - + FLA of all other motors and general loads in group (for other fuse/breaker types see table 430.52) 

**4** 

Thermal Magnetic Miniature Circuit Breakers 

## **Thermal Magnetic Miniature Circuit Breakers** 

## **Description** 

1-, 2- and 3-pole thermal-magnetic miniature circuit breakers (MCBs) in accordance with EN 60947-2, UL 1077 and UL 489 for DIN-rail mounting, with toggle actuation, visual status indication and high rupture capacity. A positively trip-free snap action mechanism ensures reliable switching behavior. A range of trip characteristics and add-on modules allow a great variety of applications. 

**UL 489 version** 

## **Typical Applications** 

- Protection of cables, motors, generators and transformers, 

- thyristors and silicon rectifiers. 

- Protection of computers and their peripheral equipment, industrial process control systems, telecommunications equipment, power supplies. 

**IEC/EN60947-2 & UL 1077 version** 

## **Technical Data** 

|**Voltage rating and current rating range**|**Voltage rating and current rating range**||
|---|---|---|
|to IEC/EN 60947-2<br>1-pole: AC 240 V; 1 A…63 A;<br>2 and 3-pole: AC 415 V, 1 A…63 A|||
||1-pole: DC 80 V, 1 A...63 A||
||2-pole: (2 poles connected in series)<br>DC 125 V, 1...63 A||
|to UL 1077|1-pole: AC 277 V; 1 A…63 A;<br>2 and 3-pole: AC 480Y/277 V, 1 A…63 A||
||1-pole: DC 60 V; 1 A...63 A||
||2-pole (2 poles connected in series):<br>DC 125 V; 1 A...63 A||
|to UL 489|1-pole: AC 120 V; 1 A…63 A;<br>2 and 3-pole: AC 240 V, 1 A…63 A;<br>1-pole: AC 277 V; 1 A…32 A;<br>2 and 3-pole: AC 480Y/277 V; 1 A…32 A;||
||1-pole: DC 60 V; 1 A…63 A||
||2-pole (2 poles connected in series);<br>DC 125 V; 1 A…63 A||
|**Typical life**|||
|Mechanically<br>Electrically|20,000 cycles<br>6,000 cycles||
|**Interupt capacity**|||
|to IEC/EN 60947-2 (Ics)<br>AC 7,500 A / DC 10,000 A<br>to IEC/EN 60947-2 (Icu)<br>AC/DC 10,000 A|||
|to UL 489|AC/DC 10,000 A||
|**to UL1077**|||
|Number|||
|of poles|Un<br>In<br>TC<br>OL|SC|
|1-pole<br>1-pole|AC 240 V<br>1...63 A<br>1<br>1<br>AC 277 V<br>1...63 A<br>1<br>0|7.5 kA, U1<br>5 kA, U1|
|2-, 3-pole|AC 480 V<br>1...63 A<br>1<br>1|5 kA, U1|
|1-pole|DC 60 V<br>1...63 A<br>1<br>0|7.5 kA, U1|
|2-pole in|DC 125 V<br>1...63 A<br>1<br>0|7.5 kA, U1|
|series|||
|Insulation coordination<br>6 kV/3 (reinforced insulation at operating area)|||



|Degree of protection|IP20|
|---|---|
|Vibration (sinusoidal) test to|± 0.38 mm (10–57 Hz), 5 g (57–500 Hz)|
|IEC 60068-2-6, test Fc|10 frequency cycles per axis|
|Shock, test to|30 g (11 ms)|
|IEC 60068-2-27, test Ea||
|Corrosion, test to|96 hrs in 5% salt mist|
|IEC 60068-2-11, test Ka||
|Humidity, test to|48 hours at 95% RH, temperature +40°C|
|IEC 60068-2-78, test Cab||
|Terminals|screw terminals; Vertical connection|
||possible by means of busbars|
|Tightening torque|2 Nm max.|
|Cable cross section|≤35 mm²|
|Ambient temperature|-35°C...+70°C|
|Mounting|rail mounting|
|Mass|approx. 116 g per pole|
||(EN 60947-2/ UL 1077)|
||approx. 131 g per pole (UL 489)|



## **Approvals** 

|**Approval**<br>**authority**|**Standard**|**Rated voltage**|**Current ratings**|
|---|---|---|---|
|TÜV|IEC/EN|AC 240/415 V|1...63 A|
||60947-2|DC 80 V|1...63 A (1-pole)|
|||DC 125 V|1...63 A|
||||(2 poles in series)|
|UL|UL 1077 /|AC 480Y/277 V|1...63 A|
||CSA-C22.2|DC 60 V|1...63 A (1-pole)|
||No. 235|DC 125 V|1...63 A|
||||(2 poles in series)|
|UL|UL 489 /|AC 240 V|1...63 A|
||CSA-C22.2|AC 480Y/277 V|1...32 A|
||No. 5|DC 60 V|1...63 A (1-pole)|
|||DC 125 V|1...63 A|
||||(2 poles in series)|



For information on Weidmuller’s UL Certifications, visit the UL Online Certifications Directory and search by the UL file numbers E359481, E362204 and E359964. 

**5** 

Thermal Magnetic Miniature Circuit Breakers 

## **UL 489 DIN-Rail Branch Rated Circuit Breakers** 

## **MCB 489 Product Selection** 

**Part Number Nomenclature** _(Part Number found on the front of the breaker)_ **MCB 489 1P B 1A ACDC** AC/DC Rated Rated Amps = 1, 1.2, 1.5, 1.6, 2, 3, 4, 5, 6, 7, 8, 10, 12, 13, 15, MCB 489 = Branch Rated Circuit Breakers 16, 20, 25, 30, 32, 35, 40, 50, 60, 63 No. of Poles = 1P, 2P or 3P Curve = B, C or D ~~|~~ **Schematic Diagrams Dimensions – UL 489 version** 1-pole 2-pole 3-pole 1 1 3 1 3 5 f ) tf tt! — 2 2 4 2 4 6 **DC Application** When using the circuit breakers in DC applications, polarity does 9 ± 0.3 not have to be ~~obs Fy~~ erved. ~~Max y~~ imum acce y) ~~pta~~ ble voltage between til the conductors depends on the number of poles, circuitry and 3 P 52.9 ± 0.6 60.2 ± 0.3 relevant standard / approval. 2 P 35.3 ± 0.4 60.1 ± 0.3 1 P 17.6 ± 0.2 **To UL 489:** Load Load 1 1 3 1 3 1 3 2 2 4 2 4 2 4 60 V 0 V 125 V ~~0~~ V 125 ~~V~~ 0 V ~~60~~ V 0 V (  ) 0 V 125 V (  ) (  ) 5.5 ± 0.3 60 V 

All dimensions without tolerances are for reference only. Weidmuller reserves the right to change specifications at any time without notice in the interest of improved design, performance and cost effectiveness. 

**6** 

Thermal Magnetic Miniature Circuit Breakers 

## **MCB 489 Series Product Selection** 

## **B Curve – UL 489 DIN-Rail Branch Circuit Breakers** 

(See Curve Drawings on page 13 and 14) 

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Amps  1 Pole 2 Pole 3 Pole<br>Rating<br>1 2477040000 MCB 489 1P B 1A ACDC 2477290000 MCB 489 2P B 1A ACDC 2477540000 MCB 489 3P B 1A ACDC<br>1.2 2477050000 MCB 489 1P B 1.2A ACDC 2477300000 MCB 489 2P B 1.2A ACDC 2477550000 MCB 489 3P B 1.2A ACDC<br>1.5 2477060000 MCB 489 1P B 1.5A ACDC 2477310000 MCB 489 2P B 1.5A ACDC 2477560000 MCB 489 3P B 1.5A ACDC<br>1.6 2477070000 MCB 489 1P B 1.6A ACDC 2477320000 MCB 489 2P B 1.6A ACDC 2477570000 MCB 489 3P B 1.6A ACDC<br>2 2477090000 MCB 489 1P B 2A ACDC 2477330000 MCB 489 2P B 2A ACDC 2477580000 MCB 489 3P B 2A ACDC<br>3 2477080000 MCB 489 1P B 3A ACDC 2477340000 MCB 489 2P B 3A ACDC 2477590000 MCB 489 3P B 3A ACDC<br>4 2477100000 MCB 489 1P B 4A ACDC 2477350000 MCB 489 2P B 4A ACDC 2477600000 MCB 489 3P B 4A ACDC<br>5 2477110000 MCB 489 1P B 5A ACDC 2477360000 MCB 489 2P B 5A ACDC 2477610000 MCB 489 3P B 5A ACDC<br>6 2477120000 MCB 489 1P B 6A ACDC 2477370000 MCB 489 2P B 6A ACDC 2477620000 MCB 489 3P B 6A ACDC<br>7 2477130000 MCB 489 1P B 7A ACDC 2477380000 MCB 489 2P B 7A ACDC 2477630000 MCB 489 3P B 7A ACDC<br>8 2477140000 MCB 489 1P B 8A ACDC 2477390000 MCB 489 2P B 8A ACDC 2477640000 MCB 489 3P B 8A ACDC<br>10 2477400000 MCB 489 2P B 10A ACDC 2477650000 MCB 489 3P B 10A ACDC<br>12 2477160000 MCB 489 1P B 12A ACDC 2477410000 MCB 489 2P B 12A ACDC 2477660000 MCB 489 3P B 12A ACDC<br>13 2477170000 MCB 489 1P B 13A ACDC 2477420000 MCB 489 2P B 13A ACDC 2477670000 MCB 489 3P B 13A ACDC<br>15 2477180000 MCB 489 1P B 15A ACDC 2477430000 MCB 489 2P B 15A ACDC 2477680000 MCB 489 3P B 15A ACDC<br>16 2477190000 MCB 489 1P B 16A ACDC 2477440000 MCB 489 2P B 16A ACDC 2477690000 MCB 489 3P B 16A ACDC<br>20 2477200000 MCB 489 1P B 20A ACDC 2477450000 MCB 489 2P B 20A ACDC 2477700000 MCB 489 3P B 20A ACDC<br>25 2477210000 MCB 489 1P B 25A ACDC 2477460000 MCB 489 2P B 25A ACDC 2477710000 MCB 489 3P B 25A ACDC<br>30 2477220000 MCB 489 1P B 30A ACDC 2477470000 MCB 489 2P B 30A ACDC 2477720000 MCB 489 3P B 30A ACDC<br>32 2477230000 MCB 489 1P B 32A ACDC 2477480000 MCB 489 2P B 32A ACDC 2477730000 MCB 489 3P B 32A ACDC<br>35 2477240000 MCB 489 1P B 35A ACDC 2477490000 MCB 489 2P B 35A ACDC 2477740000 MCB 489 3P B 35A ACDC<br>40 2477250000 MCB 489 1P B 40A ACDC 2477500000 MCB 489 2P B 40A ACDC 2477750000 MCB 489 3P B 40A ACDC<br>50 2477260000 MCB 489 1P B 50A ACDC 2477510000 MCB 489 2P B 50A ACDC 2477760000 MCB 489 3P B 50A ACDC<br>60 2477270000 MCB 489 1P B 60A ACDC 2477520000 MCB 489 2P B 60A ACDC 2477770000 MCB 489 3P B 60A ACDC<br>63 2477280000 MCB 489 1P B 63A ACDC 2477530000 MCB 489 2P B 63A ACDC 2477780000 MCB 489 3P B 63A ACDC<br>**----- End of picture text -----**<br>


**7** 

Thermal Magnetic Miniature Circuit Breakers 

## **MCB 489 Series Product Selection** 

## **C Curve – UL 489 DIN-Rail Branch Circuit Breakers** 

(See Curve Drawings on page 13 and 14) 

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Amps  1 Pole 2 Pole 3 Pole<br>Rating<br>1 2477790000 MCB 489 1P C 1A ACDC 2478040000 MCB 489 2P C 1A ACDC 2478290000 MCB 489 3P C 1A ACDC<br>1.2 2477800000 MCB 489 1P C 1.2A ACDC 2478050000 MCB 489 2P C 1.2A ACDC 2478300000 MCB 489 3P C 1.2A ACDC<br>1.5 2477810000 MCB 489 1P C 1.5A ACDC 2478060000 MCB 489 2P C 1.5A ACDC 2478310000 MCB 489 3P C 1.5A ACDC<br>1.6 2477820000 MCB 489 1P C 1.6A ACDC 2478070000 MCB 489 2P C 1.6A ACDC 2478320000 MCB 489 3P C 1.6A ACDC<br>2 2477830000 MCB 489 1P C 2A ACDC 2478080000 MCB 489 2P C 2A ACDC 2478330000 MCB 489 3P C 2A ACDC<br>3 2477840000 MCB 489 1P C 3A ACDC 2478090000 MCB 489 2P C 3A ACDC 2478340000 MCB 489 3P C 3A ACDC<br>4 2477850000 MCB 489 1P C 4A ACDC 2478100000 MCB 489 2P C 4A ACDC 2478350000 MCB 489 3P C 4A ACDC<br>5 2477860000 MCB 489 1P C 5A ACDC 2478110000 MCB 489 2P C 5A ACDC 2478360000 MCB 489 3P C 5A ACDC<br>6 2477870000 MCB 489 1P C 6A ACDC 2478120000 MCB 489 2P C 6A ACDC 2478370000 MCB 489 3P C 6A ACDC<br>7 2477880000 MCB 489 1P C 7A ACDC 2478130000 MCB 489 2P C 7A ACDC 2478380000 MCB 489 3P C 7A ACDC<br>8 2477890000 MCB 489 1P C 8A ACDC 2478140000 MCB 489 2P C 8A ACDC 2478390000 MCB 489 3P C 8A ACDC<br>10 2477900000 MCB 489 1P C 10A ACDC 2478150000 MCB 489 2P C 10A ACDC 2478400000 MCB 489 3P C 10A ACDC<br>12 2477910000 MCB 489 1P C 12A ACDC 2478160000 MCB 489 2P C 12A ACDC 2478410000 MCB 489 3P C 12A ACDC<br>13 2477920000 MCB 489 1P C 13A ACDC 2478170000 MCB 489 2P C 13A ACDC 2478420000 MCB 489 3P C 13A ACDC<br>15 2477930000 MCB 489 1P C 15A ACDC 2478180000 MCB 489 2P C 15A ACDC 2478430000 MCB 489 3P C 15A ACDC<br>16 2477940000 MCB 489 1P C 16A ACDC 2478190000 MCB 489 2P C 16A ACDC 2478440000 MCB 489 3P C 16A ACDC<br>20 2477950000 MCB 489 1P C 20A ACDC 2478200000 MCB 489 2P C 20A ACDC 2478450000 MCB 489 3P C 20A ACDC<br>25 2477960000 MCB 489 1P C 25A ACDC 2478210000 MCB 489 2P C 25A ACDC 2478460000 MCB 489 3P C 25A ACDC<br>30 2477970000 MCB 489 1P C 30A ACDC 2478220000 MCB 489 2P C 30A ACDC 2478470000 MCB 489 3P C 30A ACDC<br>32 2477980000 MCB 489 1P C 32A ACDC 2478230000 MCB 489 2P C 32A ACDC 2478480000 MCB 489 3P C 32A ACDC<br>35 2477990000 MCB 489 1P C 35A ACDC 2478240000 MCB 489 2P C 35A ACDC 2478490000 MCB 489 3P C 35A ACDC<br>40 2478000000 MCB 489 1P C 40A ACDC 2478250000 MCB 489 2P C 40A ACDC 2478500000 MCB 489 3P C 40A ACDC<br>50 2478010000 MCB 489 1P C 50A ACDC 2478260000 MCB 489 2P C 50A ACDC 2478510000 MCB 489 3P C 50A ACDC<br>60 2478020000 MCB 489 1P C 60A ACDC 2478270000 MCB 489 2P C 60A ACDC 2478520000 MCB 489 3P C 60A ACDC<br>63 2478030000 MCB 489 1P C 63A ACDC 2478280000 MCB 489 2P C 63A ACDC 2478530000 MCB 489 3P C 63A ACDC<br>**----- End of picture text -----**<br>


**8** 

Thermal Magnetic Miniature Circuit Breakers 

## **MCB 489 Series Product Selection** 

## **D Curve – UL 489 DIN-Rail Branch Circuit Breakers** 

(See Curve Drawings on page 13 and 14) 

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Amps  1 Pole 2 Pole 3 Pole<br>Rating<br>1 2478540000 MCB 489 1P D 1A ACDC 2478790000 MCB 489 2P D 1A ACDC 2479030000 MCB 489 3P D 1A ACDC<br>1.2 2478550000 MCB 489 1P D 1.2A ACDC 2478800000 MCB 489 2P D 1.2A ACDC 2479040000 MCB 489 3P D 1.2A ACDC<br>1.5 2478560000 MCB 489 1P D 1.5A ACDC 2478810000 MCB 489 2P D 1.5A ACDC 2479050000 MCB 489 3P D 1.5A ACDC<br>1.6 2478570000 MCB 489 1P D 1.6A ACDC 2478820000 MCB 489 2P D 1.6A ACDC 2479060000 MCB 489 3P D 1.6A ACDC<br>2 2478580000 MCB 489 1P D 2A ACDC 2478830000 MCB 489 2P D 2A ACDC 2479070000 MCB 489 3P D 2A ACDC<br>3 2478590000 MCB 489 1P D 3A ACDC 2478840000 MCB 489 2P D 3A ACDC 2479080000 MCB 489 3P D 3A ACDC<br>4 2478600000 MCB 489 1P D 4A ACDC 2478850000 MCB 489 2P D 4A ACDC 2479090000 MCB 489 3P D 4A ACDC<br>5 2478860000 MCB 489 2P D 5A ACDC 2479100000 MCB 489 3P D 5A ACDC<br>6 2478620000 MCB 489 1P D 6A ACDC 2478870000 MCB 489 2P D 6A ACDC 2479110000 MCB 489 3P D 6A ACDC<br>7 2478630000 MCB 489 1P D 7A ACDC 2479120000 MCB 489 3P D 7A ACDC<br>8 2478640000 MCB 489 1P D 8A ACDC 2478880000 MCB 489 2P D 8A ACDC 2479130000 MCB 489 3P D 8A ACDC<br>10 2478650000 MCB 489 1P D 10A ACDC 2478890000 MCB 489 2P D 10A ACDC 2479140000 MCB 489 3P D 10A ACDC<br>12 2478660000 MCB 489 1P D 12A ACDC 2478900000 MCB 489 2P D 12A ACDC 2479150000 MCB 489 3P D 12A ACDC<br>13 2478670000 MCB 489 1P D 13A ACDC 2478910000 MCB 489 2P D 13A ACDC 2479160000 MCB 489 3P D 13A ACDC<br>15 2478680000 MCB 489 1P D 15A ACDC 2478920000 MCB 489 2P D 15A ACDC 2479170000 MCB 489 3P D 15A ACDC<br>16 2478690000 MCB 489 1P D 16A ACDC 2478930000 MCB 489 2P D 16A ACDC 2479180000 MCB 489 3P D 16A ACDC<br>20 2478700000 MCB 489 1P D 20A ACDC 2478940000 MCB 489 2P D 20A ACDC 2479190000 MCB 489 3P D 20A ACDC<br>25 2478710000 MCB 489 1P D 25A ACDC 2478950000 MCB 489 2P D 25A ACDC 2479200000 MCB 489 3P D 25A ACDC<br>30 2478720000 MCB 489 1P D 30A ACDC 2478960000 MCB 489 2P D 30A ACDC 2479210000 MCB 489 3P D 30A ACDC<br>32 2478730000 MCB 489 1P D 32A ACDC 2478970000 MCB 489 2P D 32A ACDC 2479220000 MCB 489 3P D 32A ACDC<br>35 2478740000 MCB 489 1P D 35A ACDC 2478980000 MCB 489 2P D 35A ACDC 2479230000 MCB 489 3P D 35A ACDC<br>40 2478750000 MCB 489 1P D 40A ACDC 2478990000 MCB 489 2P D 40A ACDC 2479240000 MCB 489 3P D 40A ACDC<br>50 2478760000 MCB 489 1P D 50A ACDC 2479000000 MCB 489 2P D 50A ACDC 2479250000 MCB 489 3P D 50A ACDC<br>60 2478770000 MCB 489 1P D 60A ACDC 2479010000 MCB 489 2P D 60A ACDC 2479260000 MCB 489 3P D 60A ACDC<br>63 2478780000 MCB 489 1P D 63A ACDC 2479020000 MCB 489 2P D 63A ACDC<br>**----- End of picture text -----**<br>


**9** 

Thermal Magnetic Miniature Circuit Breakers 

## **UL 1077 DIN-Rail Supplementary Circuit Breakers** 

## **MCB 1077 Product Selection** 

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**----- Start of picture text -----**<br>
Part Number Nomenclature<br>(Part Number found on the front of the breaker)<br>MCB1077 2P D 60A ACDC<br>AC/DC Rated<br>Rated Amps = 1, 1.2, 1.5, 1.6, 2, 3, 4, 5, 6, 7, 8, 10,<br>MCB 1077 = Supplementary Protectors<br>12, 13, 15, 16, 20, 25, 30, 32, 35, 40, 50, 60, 63<br>No. of Poles = 1P, 2P or 3P Curve = B, C or D<br>— || ==<br>Schematic Diagrams Dimensions – IEC/EN 60947-2 / UL1077 version<br>1-pole 2-pole 3-pole<br>1 1 3 1 3 5<br>aaenaa<br>2 2 4 2 4 6<br>**----- End of picture text -----**<br>


## **DC Application** 

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When using the circuit breakers in DC applications, polarity does<br>not have to be observed. Maximum acceptable voltage between<br>the conductors depends on the number of poles, circuitry and  9 ± 0.3 60.2 ± 0.3<br>relevant standard / approval. 49.8 ± 0.3<br>3 P 52.9 ± 0.6<br>To IEC/EN 60947-2: 2 P 35.3 ± 0.4<br>1 P 17.6 ± 0.2<br>Load Load<br>1 1 3 1 3 1 3<br>2 2 4 2 4 2 4<br>80 V 0 V 125 V 0 V 125 V 0 V 80 V 0 V<br>(  ) 0 V 125 V (  ) (  )<br>To UL 1077:<br>RAT Load Load a 5.5 ± 0.3<br>1 1 3 1 3 1 3 All dimensions without tolerances are for reference only.<br>2 2 4 2 4 2 4 Weidmuller reserves the right to change specifications at<br>any time without notice in the interest of improved design,<br>performance and cost effectiveness.<br>60 V 0 V 125 V 0 V 125 V 0 V 60 V 0 V<br>4 (  ) 0 V 125 V (  ) (  )<br>10<br>80 V<br>60 V<br>Load Load<br>Load 82 max. 45 ± 0.3<br>Load Load<br>Load<br>**----- End of picture text -----**<br>


Thermal Magnetic Miniature Circuit Breakers 

## **MCB 1077 Product Selection** 

## **B Curve – UL 1077 DIN-Rail Supplementary Circuit Breakers** 

(See Curve Drawings on page 13 and 14) 

**==> picture [542 x 388] intentionally omitted <==**

**----- Start of picture text -----**<br>
Amps 1 Pole 2 Pole 3 Pole<br>Rating<br>1 2479280000 MCB 1077 1P B 1A ACDC 2479520000 MCB 1077 2P B 1A ACDC 2479760000 MCB 1077 3P B 1A ACDC<br>1.2 2479290000 MCB 1077 1P B 1.2A ACDC 2479530000 MCB 1077 2P B 1.2A ACDC 2479770000 MCB 1077 3P B 1.2A ACDC<br>1.5 2479300000 MCB 1077 1P B 1.5A ACDC 2479540000 MCB 1077 2P B 1.5A ACDC 2479780000 MCB 1077 3P B 1.5A ACDC<br>1.6 2479310000 MCB 1077 1P B 1.6A ACDC 2521330000 MCB 1077 2P B 1.6A ACDC 2479790000 MCB 1077 3P B 1.6A ACDC<br>2 2479320000 MCB 1077 1P B 2A ACDC 2479560000 MCB 1077 2P B 2A ACDC 2479800000 MCB 1077 3P B 2A ACDC<br>3 2479330000 MCB 1077 1P B 3A ACDC 2479570000 MCB 1077 2P B 3A ACDC 2479810000 MCB 1077 3P B 3A ACDC<br>4 2479340000 MCB 1077 1P B 4A ACDC 2479580000 MCB 1077 2P B 4A ACDC 2479820000 MCB 1077 3P B 4A ACDC<br>5 2479350000 MCB 1077 1P B 5A ACDC 2479590000 MCB 1077 2P B 5A ACDC 2479830000 MCB 1077 3P B 5A ACDC<br>6 2479360000 MCB 1077 1P B 6A ACDC 2479600000 MCB 1077 2P B 6A ACDC 2479840000 MCB 1077 3P B 6A ACDC<br>7 2479370000 MCB 1077 1P B 7A ACDC 2479610000 MCB 1077 2P B 7A ACDC 2479850000 MCB 1077 3P B 7A ACDC<br>8 2479380000 MCB 1077 1P B 8A ACDC 2479620000 MCB 1077 2P B 8A ACDC 2479860000 MCB 1077 3P B 8A ACDC<br>10 2515110000 MCB 1077 1P B 10A ACDC 2479630000 MCB 1077 2P B 10A ACDC 2479870000 MCB 1077 3P B 10A ACDC<br>12 2479400000 MCB 1077 1P B 12A ACDC 2479640000 MCB 1077 2P B 12A ACDC 2479880000 MCB 1077 3P B 12A ACDC<br>13 2479410000 MCB 1077 1P B 13A ACDC 2479650000 MCB 1077 2P B 13A ACDC 2479890000 MCB 1077 3P B 13A ACDC<br>15 2479420000 MCB 1077 1P B 15A ACDC 2479660000 MCB 1077 2P B 15A ACDC 2479900000 MCB 1077 3P B 15A ACDC<br>16 2479430000 MCB 1077 1P B 16A ACDC 2479670000 MCB 1077 2P B 16A ACDC 2479910000 MCB 1077 3P B 16A ACDC<br>20 2479440000 MCB 1077 1P B 20A ACDC 2479680000 MCB 1077 2P B 20A ACDC 2479920000 MCB 1077 3P B 20A ACDC<br>25 2479450000 MCB 1077 1P B 25A ACDC 2479690000 MCB 1077 2P B 25A ACDC 2479930000 MCB 1077 3P B 25A ACDC<br>30 2479460000 MCB 1077 1P B 30A ACDC 2479700000 MCB 1077 2P B 30A ACDC 2479940000 MCB 1077 3P B 30A ACDC<br>32 2515120000 MCB 1077 1P B 32A ACDC 2515130000 MCB 1077 2P B 32A ACDC 2515140000 MCB 1077 3P B 32A ACDC<br>35 2479470000 MCB 1077 1P B 35A ACDC 2479710000 MCB 1077 2P B 35A ACDC 2479950000 MCB 1077 3P C 35A ACDC<br>40 2479480000 MCB 1077 1P B 40A ACDC 2479720000 MCB 1077 2P B 40A ACDC 2479960000 MCB 1077 3P C 40A ACDC<br>50 2479490000 MCB 1077 1P B 50A ACDC 2479730000 MCB 1077 2P B 50A ACDC 2479970000 MCB 1077 3P C 50A ACDC<br>60 2479500000 MCB 1077 1P B 60A ACDC 2479740000 MCB 1077 2P B 60A ACDC 2479980000 MCB 1077 3P C 60A ACDC<br>63 2479510000 MCB 1077 1P B 63A ACDC 2479750000 MCB 1077 2P B 63A ACDC 2479990000 MCB 1077 3P C 63A ACDC<br>**----- End of picture text -----**<br>


**11** 

Thermal Magnetic Miniature Circuit Breakers 

## **MCB 1077 Product Selection** 

## **C Curve – UL 1077 DIN-Rail Supplementary Circuit Breakers** 

(See Curve Drawings on page 13 and 14) 

**==> picture [542 x 388] intentionally omitted <==**

**----- Start of picture text -----**<br>
Amps 1 Pole 2 Pole 3 Pole<br>Rating<br>1 2480000000 MCB 1077 1P C 1A ACDC 2480240000 MCB 1077 2P C 1A ACDC 2480480000 MCB 1077 3P C 1A ACDC<br>1.2 2480010000 MCB 1077 1P C 1.2A ACDC 2480250000 MCB 1077 2P C 1.2A ACDC 2480490000 MCB 1077 3P C 1.2A ACDC<br>1.5 2480020000 MCB 1077 1P C 1.5A ACDC 2480260000 MCB 1077 2P C 1.5A ACDC 2480500000 MCB 1077 3P C 1.5A ACDC<br>1.6 2480030000 MCB 1077 1P C 1.6A ACDC 2480270000 MCB 1077 2P C 1.6A ACDC 2480510000 MCB 1077 3P C 1.6A ACDC<br>2 2480040000 MCB 1077 1P C 2A ACDC 2480280000 MCB 1077 2P C 2A ACDC 2480520000 MCB 1077 3P C 2A ACDC<br>3 2480050000 MCB 1077 1P C 3A ACDC 2480290000 MCB 1077 2P C 3A ACDC 2480530000 MCB 1077 3P C 3A ACDC<br>4 2480060000 MCB 1077 1P C 4A ACDC 2480300000 MCB 1077 2P C 4A ACDC 2480540000 MCB 1077 3P C 4A ACDC<br>5 2480070000 MCB 1077 1P C 5A ACDC 2480310000 MCB 1077 2P C 5A ACDC 2480550000 MCB 1077 3P C 5A ACDC<br>6 2480080000 MCB 1077 1P C 6A ACDC 2480320000 MCB 1077 2P C 6A ACDC 2480560000 MCB 1077 3P C 6A ACDC<br>7<br>8 2480090000 MCB 1077 1P C 8A ACDC 2480330000 MCB 1077 2P C 8A ACDC 2480570000 MCB 1077 3P C 8A ACDC<br>10 2480100000 MCB 1077 1P C 10A ACDC 2480340000 MCB 1077 2P C 10A ACDC 2480580000 MCB 1077 3P C 10A ACDC<br>12 2480110000 MCB 1077 1P C 12A ACDC 2480350000 MCB 1077 2P C 12A ACDC 2480590000 MCB 1077 3P C 12A ACDC<br>13 2480120000 MCB 1077 1P C 13A ACDC 2480360000 MCB 1077 2P C 13A ACDC 2480600000 MCB 1077 3P C 13A ACDC<br>15 2480130000 MCB 1077 1P C 15A ACDC 2480370000 MCB 1077 2P C 15A ACDC 2480610000 MCB 1077 3P C 15A ACDC<br>16 2480140000 MCB 1077 1P C 16A ACDC 2480380000 MCB 1077 2P C 16A ACDC 2480620000 MCB 1077 3P C 16A ACDC<br>20 2480150000 MCB 1077 1P C 20A ACDC 2480390000 MCB 1077 2P C 20A ACDC 2480630000 MCB 1077 3P C 20A ACDC<br>25 2480160000 MCB 1077 1P C 25A ACDC 2480400000 MCB 1077 2P C 25A ACDC 2480640000 MCB 1077 3P C 25A ACDC<br>30 2480170000 MCB 1077 1P C 30A ACDC 2480410000 MCB 1077 2P C 30A ACDC 2480650000 MCB 1077 3P C 30A ACDC<br>32 2480180000 MCB 1077 1P C 32A ACDC 2480420000 MCB 1077 2P C 32A ACDC 2480660000 MCB 1077 3P C 32A ACDC<br>35 2480190000 MCB 1077 1P C 35A ACDC 2480430000 MCB 1077 2P C 35A ACDC 2480670000 MCB 1077 3P C 35A ACDC<br>40 2480200000 MCB 1077 1P C 40A ACDC 2480440000 MCB 1077 2P C 40A ACDC 2480680000 MCB 1077 3P C 40A ACDC<br>50 2480210000 MCB 1077 1P C 50A ACDC 2480450000 MCB 1077 2P C 50A ACDC 2480690000 MCB 1077 3P C 50A ACDC<br>60 2480220000 MCB 1077 1P C 60A ACDC 2480460000 MCB 1077 2P C 60A ACDC 2480700000 MCB 1077 3P C 60A ACDC<br>63 2480230000 MCB 1077 1P C 63A ACDC 2480470000 MCB 1077 2P C 63A ACDC 2480710000 MCB 1077 3P C 63A ACDC<br>**----- End of picture text -----**<br>


**12** 

Thermal Magnetic Miniature Circuit Breakers 

## **MCB 1077 Product Selection** 

## **D Curve – UL 1077 DIN-Rail Supplementary Circuit Breakers** 

(See Curve Drawings on page 13 and 14) 

**==> picture [542 x 388] intentionally omitted <==**

**----- Start of picture text -----**<br>
Amps 1 Pole 2 Pole 3 Pole<br>Rating<br>1 2480720000 MCB 1077 1P D 1A ACDC 2480960000 MCB 1077 2P D 1A ACDC 2481200000 MCB 1077 3P D 1A ACDC<br>1.2 2480730000 MCB 1077 1P D 1.2A ACDC 2480970000 MCB 1077 2P D 1.2A ACDC 2481210000 MCB 1077 3P D 1.2A ACDC<br>1.5 2480740000 MCB 1077 1P D 1.5A ACDC 2480980000 MCB 1077 2P D 1.5A ACDC 2481220000 MCB 1077 3P D 1.5A ACDC<br>1.6 2480750000 MCB 1077 1P D 1.6A ACDC 2480990000 MCB 1077 2P D 1.6A ACDC 2481230000 MCB 1077 3P D 1.6A ACDC<br>2 2480760000 MCB 1077 1P D 2A ACDC 2481000000 MCB 1077 2P D 2A ACDC 2481240000 MCB 1077 3P D 2A ACDC<br>3 2480770000 MCB 1077 1P D 3A ACDC 2481010000 MCB 1077 2P D 3A ACDC 2481250000 MCB 1077 3P D 3A ACDC<br>4 2480780000 MCB 1077 1P D 4A ACDC 2481020000 MCB 1077 2P D 4A ACDC 2481260000 MCB 1077 3P D 4A ACDC<br>5 2480790000 MCB 1077 1P D 5A ACDC 2481030000 MCB 1077 2P D 5A ACDC 2481270000 MCB 1077 3P D 5A ACDC<br>6 2480800000 MCB 1077 1P D 6A ACDC 2481040000 MCB 1077 2P D 6A ACDC 2481280000 MCB 1077 3P D 6A ACDC<br>7 2481290000 MCB 1077 3P D 7A ACDC<br>8 2480810000 MCB 1077 1P D 8A ACDC 2481050000 MCB 1077 2P D 8A ACDC 2481300000 MCB 1077 3P D 8A ACDC<br>10 2480820000 MCB 1077 1P D 10A ACDC 2481060000 MCB 1077 2P D 10A ACDC 2481310000 MCB 1077 3P D 10A ACDC<br>12 2480830000 MCB 1077 1P D 12A ACDC 2481070000 MCB 1077 2P D 12A ACDC 2481320000 MCB 1077 3P D 12A ACDC<br>13 2480840000 MCB 1077 1P D 13A ACDC 2481080000 MCB 1077 2P D 13A ACDC 2481330000 MCB 1077 3P D 13A ACDC<br>15 2480850000 MCB 1077 1P D 15A ACDC 2481090000 MCB 1077 2P D 15A ACDC 2481340000 MCB 1077 3P D 15A ACDC<br>16 2480860000 MCB 1077 1P D 16A ACDC 2481100000 MCB 1077 2P D 16A ACDC 2481350000 MCB 1077 3P D 16A ACDC<br>20 2480870000 MCB 1077 1P D 20A ACDC 2481110000 MCB 1077 2P D 20A ACDC 2481360000 MCB 1077 3P D 20A ACDC<br>25 2480880000 MCB 1077 1P D 25A ACDC 2481120000 MCB 1077 2P D 25A ACDC 2481370000 MCB 1077 3P D 25A ACDC<br>30 2480890000 MCB 1077 1P D 30A ACDC 2481130000 MCB 1077 2P D 30A ACDC 2481380000 MCB 1077 3P D 30A ACDC<br>32 2480900000 MCB 1077 1P D 32A ACDC 2481140000 MCB 1077 2P D 32A ACDC 2481390000 MCB 1077 3P D 32A ACDC<br>35 2480910000 MCB 1077 1P D 35A ACDC 2481150000 MCB 1077 2P D 35A ACDC 2481400000 MCB 1077 3P D 35A ACDC<br>40 2480920000 MCB 1077 1P D 40A ACDC 2481160000 MCB 1077 2P D 40A ACDC 2481410000 MCB 1077 3P D 40A ACDC<br>50 2480930000 MCB 1077 1P D 50A ACDC 2481170000 MCB 1077 2P D 50A ACDC 2481420000 MCB 1077 3P D 50A ACDC<br>60 2480940000 MCB 1077 1P D 60A ACDC 2481180000 MCB 1077 2P D 60A ACDC 2481430000 MCB 1077 3P D 60A ACDC<br>63 2480950000 MCB 1077 1P D 63A ACDC 2481190000 MCB 1077 2P D 63A ACDC 2481440000 MCB 1077 3P D 63A ACDC<br>**----- End of picture text -----**<br>


**13** 

Thermal Magnetic Miniature Circuit Breakers 

## **Trip Curves** 

## Trip Curves B, C, D – overcurrent protection of cables in accordance with IEC/EN 60898-1 and IEC 60947-2 

## **Time/Current Characteristics** 

**==> picture [186 x 282] intentionally omitted <==**

**----- Start of picture text -----**<br>
Curve B  / 1 ... 63 A<br>10000<br>1000<br>100<br>10<br>1<br>0,1<br>0,01<br>0,8 1 2 4 6 8 10 20 40<br>...times rated current<br>Magnetic tripping currents are increased by 30 % on DC supplies.<br>Ambient temperature 30 °C<br>Trip time in seconds<br>**----- End of picture text -----**<br>


## **Trip between 3-5X rated current (30-50 Amp for a 10 Amp device)** 

Residential and light commercial applications such as: 

- Resistive loads (low surge current) 

- Low switching surge current 

- Wire protection 

- Lighting 

- Appliances 

**Curve C** / 1 ... 63 A 

**==> picture [188 x 271] intentionally omitted <==**

**----- Start of picture text -----**<br>
10000<br>1000<br>100<br>10<br>1<br>0,1<br>0,01<br>0,8 1 2 4 6 8 10 20 40<br>...times rated current<br>Magnetic tripping currents are increased by 30 % on DC supplies.<br>Ambient temperature 30 °C<br>Trip time in seconds<br>**----- End of picture text -----**<br>


## **Trip between 5-10X rated current (50-100 Amp for a 10 Amp device)** 

Commercial applications such as: 

- Inductive loads 

- Motors (low inrush current) 

- Control circuitry 

- Lighting 

- Appliances 

**14** 

Thermal Magnetic Miniature Circuit Breakers 

## **Curve D** / 1 ... 63 A 

**==> picture [193 x 277] intentionally omitted <==**

**----- Start of picture text -----**<br>
10000<br>1000<br>100<br>10<br>1<br>0,1<br>0,01<br>0,8 1 2 4 6 8 10 20 40<br>...times rated current<br>Magnetic tripping currents are increased by 30 % on DC supplies.<br>Ambient temperature 30 °C<br>Trip time in seconds<br>**----- End of picture text -----**<br>


## **Trip between 10-20X rated current (100-200 Amp for a 10 Amp device)** 

Industrial applications such as: 

- High inductive and capacitive loads 

- Motors (higher inrush current) 

- Power supplies 

- Transformers 

- Heaters 

- X-ray machines 

- Reactive loads 

## **Current ratings and voltage drop at +25°C** 

|**Voltage drop in V at 1 IN**|**Voltage drop in V at 1 IN**||||||
|---|---|---|---|---|---|---|
|IN(A)|1|1.2|1.5|1.6|2|3|
|V|1.50|1.50|0.80|0.80|0.80|0.60|
|IN(A)|4|5|6|7|8|10|
|V|0.60|0.20|0.20|0.20|0.15|0.15|
|IN(A)|12|13|15|16|20|25|
|V|0.15|0.10|0.10|0.10|0.08|0.08|
|IN(A)|30|32|35|40|50|60|
|V|0.07|0.07|0.07|0.07|0.06|0.06|
|IN(A)|63||||||
|V|0.06||||||



**Note:** When mounted side-by-side, the breakers can only carry up to 80% of their rated current or a higher rating has to be selected 

**15** 

Thermal Magnetic Miniature Circuit Breakers 

## **Accessories** 

## Accessory Modules 

## **Auxiliary Contact** 

## **Description** 

Add-on module for circuit breaker type MCB 498 and MCB 1077. The auxiliary switch has a change-over contact as signal contact and is operated with actuation of the MCB. The module has screw terminals and is rated for AC and DC voltages. 

## **Typical Applications** 

Status monitoring of MCB and/or the connected loads. 

**Description Part Number** ~~ES~~ MCB AUX Contact 1NC **7940099227** 

## **Schematic Diagrams** 

## **Note:** 

**==> picture [9 x 6] intentionally omitted <==**

**----- Start of picture text -----**<br>
11<br>**----- End of picture text -----**<br>


As soon as the auxiliary contact module is mounted on the MCB, the terminals 11 and 14 are connected when the MCB is in ON condition. Terminals 11 and 12 are connected 

## **Technical Data** 

## **Rated currents to IEC/EN 60947-5-1:** 

|Voltage<br>ratings:<br>AC 240 V<br>AC 415 V<br>DC 24 V<br>DC 48 V<br>DC 130 V<br>Current<br>ratings:<br>6 A<br>3 A<br>6 A<br>2 A<br>1 A<br>12<br>14<br>condition. Terminals 11 and 12 are connected<br>when the MCB is in OFF condition.|Voltage<br>ratings:<br>AC 240 V<br>AC 415 V<br>DC 24 V<br>DC 48 V<br>DC 130 V<br>Current<br>ratings:<br>6 A<br>3 A<br>6 A<br>2 A<br>1 A<br>12<br>14<br>condition. Terminals 11 and 12 are connected<br>when the MCB is in OFF condition.|condition. Terminals 11 and 12 are connected|
|---|---|---|
|**Rated currents to UL 489:**<br>Voltage<br>ratings:<br>AC 12<br>… 240 V<br>AC 277 V<br>DC 12<br>... 24 V<br>DC 48 V<br>DC 110<br>... 220 V<br>Current<br>ratings:<br>6 A<br>3 A<br>6 A<br>3 A<br>1.5 A<br>Typical life<br>20,000 cycles<br>Tightening torque<br>1 Nm max.<br>Ambient temperature<br>-35°C ...+70°C<br>Width<br>9 mm<br>Mass<br>approx. 29 g<br>**Approvals**<br>**Approval authority**<br>**Standard**<br>TÜV<br>IEC/EN 60947-5-1<br>UL<br>UL 489<br>**Dimensions (in millimeters)**<br>45  ± 0.5<br>85.8  ± 0.5<br>66  ± 0.5<br>60.4  ± 0.5<br>5.5  ± 0.5<br>~~ae~~|81  ± 0.5|9|



**16** 

Thermal Magnetic Miniature Circuit Breakers 

## **Bell Alarm Contact** 

## **Description** 

Add-on module for MCB 498 and MCB 1077. The bell alarm contact has a change-over contact as signal contact. There will only be a signal when the MCB tripped on grounds of a failure (overload, short circuit), but and not when the MCB was switched on or off manually. 

By actuating the reset lever on the front the tripping signal is acknowledged. 

## **Typical Applications** 

Status monitoring of MCB and/or the connected loads. 

## **Mounting** 

The add-on module is mounted on the left side of the MCB (seen from the front). For mounting, the MCB has to be in the OFF position. 

|**Description**||||**Part Number**|
|---|---|---|---|---|
|MCB/AUX Bell Alarm Contact 1NC/1NO|MCB/AUX Bell Alarm Contact 1NC/1NO|||**7940099228**|
|**Technical Data**|||||
|**Rated currents to IEC/EN 60947-5-1:**|||||
|Voltage<br>ratings:<br>AC 240 V|AC 415 V|DC 24 V|DC 48 V|DC 130 V|
|Current<br>ratings:<br>6 A|3 A|6 A|2 A|1 A|
|**Rated currents to UL 489:**|||||
|Voltage<br>AC 12|AC 277 V|DC 12|DC 48 V|DC 110|
|ratings:<br>… 240 V||... 24 V||... 220 V|
|Current<br>6 A|3 A|6 A|3 A|1.5 A|
|ratings:<br>Typical life<br>20,000 cycles<br>~~OO~~|||||
|Tightening torque||1 Nm max.|||
|Ambient temperature<br>-35°C ...+70°C<br>Width<br>9 mm<br>Mass<br>approx. 29 g<br>~~————S—$~~<br>~~i~~<br>~~et~~|||||



## ~~———~~ **ApprovalsApproval authority Standard** ~~eS a~~ UL UL 489 

## **Schematic Diagrams** 

## **Note:** 

**==> picture [226 x 298] intentionally omitted <==**

**----- Start of picture text -----**<br>
91<br>As soon as the bell alarm contact module is<br>mounted on the MCB, the terminals 91 and<br>-------\ 92 are connected when the MCB is in ON<br>condition; the terminals 91 and 94 are con-<br>nected when the MCB tripped electrically; the<br>94 92 terminals 91 and 92 are connected when the<br>MCB was tripped manually; at the same time<br>the terminals 91 and 94 do not have contact.<br>Dimensions (in millimeters)<br>66  ± 0.5<br>9<br>60.4  ± 0.5<br>i = afts<br>eo BAU<br>1 = y i i<br>_BAUIi<br>Weidmiiller y<br>on125V= 1.5Aa itustep = S084<br>Madein China —«—«‘Reteond, VA‘23206<br>: 3<br>=o)...a *®. -<br>194<br>4<br>85.8  ± 0.5 45  ± 0.5 81  ± 0.5<br>5.5  ± 0.5<br>**----- End of picture text -----**<br>


## **Dimensions (in millimeters)** 

**17** 

Thermal Magnetic Miniature Circuit Breakers 

## **Shunt Trip** 

## **Description** 

Add-on module for MCB type BR/SUxxxUC. The shunt trip module serves for remote trip of the MCB and for signalling whether the MCB was tripped electrically or manually. 

## **Typical Applications** 

Electrical remote trip of safety equipment with simultaneous monitoring of MCB status or its connected load. 

## **Mounting** 

The add-on module is mounted on the left side of the MCB (seen from the front). For mounting, the MCB has to be in the OFF position. When auxiliary contact module/bell alarm contact module and a shunt trip module are mounted at the same time, the shunt trip module always has to be mounted first. 

|module and a shunt trip module are mounted at the same time,<br>the shunt trip module always has to be mounted first.|module and a shunt trip module are mounted at the same time,<br>the shunt trip module always has to be mounted first.|
|---|---|
|**Description**|**Part Number**|
|MCB SHUNT 1NC/1NO 12VDC|**7940104512**|
|MCB SHUNT 1NC/1NO 24VDC|**7940099319**|
|MCB SHUNT 1NC/1NO 48VDC|**7940104515**|
|MCB SHUNT 1NC/1NO 125VDC|**7940104511**|
|MCB SHUNT 1NC/1NO 120VA VAC|**7940104510**|
|MCB SHUNT 1NC/1NO 240VA VAC|**7940104513**|
|MCB SHUNT 1NC/1NO 277VA VAC|**7940104514**|



## **Schematic Diagrams** 

**==> picture [85 x 60] intentionally omitted <==**

**----- Start of picture text -----**<br>
N / - L / +<br>C1 C2 11<br>FA<br>14 12<br>**----- End of picture text -----**<br>


## **Technical Data** 

## **Dimensions (in millimeters)** 

|Voltage ratings AC|AC 277 V|AC 240 V|AC 120 V|
|---|---|---|---|
|Min. trip voltage|AC 160 V|AC 160 V|AC 80 V|
|Power consumption|240 W|200 W|200 W|
|min. response power|35 W|35 W|35 W|
|Rated current of|3 A|6 A|6 A|
|auxiliary contact||||
|Voltage ratings DC<br>DC 125 V<br>DC 48 V<br>DC 24 V<br>DC 12 V<br>Min. trip voltage<br>DC 80 V<br>DC 24 V<br>DC 16 V<br>DC 8 V<br>Power consumption<br>min. response power<br>200 W<br>30 VA<br>200 W<br>30 VA<br>200 W<br>30 VA<br>200 W<br>30 VA<br>Rated current of<br>auxiliary contact<br>1.5 A<br>2 A<br>6 A<br>6 A<br>Trip time<br>< 10 ms<br>~~ee~~<br>~~——————a~~||||
|Typical life<br>Tightening torque<br>Ambient temperature|20,000 cycles<br>1 Nm max.<br>-35°C...+70°C|||
|Width|18 mm|||
|Mass|approx. 60 g|||



**==> picture [229 x 116] intentionally omitted <==**

**----- Start of picture text -----**<br>
66  ± 0.5 18 max.<br>60.1  ± 0.5<br>ee al —= / |<br>a [|]<br>a<br>83  ± 0.5 5.5  ± 0.5 45  ± 0.5 81  ± 0.5<br>**----- End of picture text -----**<br>


## **Approvals** 

|**Approval authority**|**Approval authority**<br>**Standard**|
|---|---|
|UL|UL 489|



**18** 

Thermal Magnetic Miniature Circuit Breakers 

## **Accessories** Accessory Modules Installation Diagram 

|**Bell Alarm**<br>**Auxiliary**|||
|---|---|---|
|**Shunt Trip**<br>**MCB 489 or 1077**|**MCB 489 or 1077**||
|**Bell Alarm**<br>**Auxiliary**<br>**Auxiliary**<br>**Auxiliary**<br>**Auxiliary**<br>**Auxiliary**<br>**Compatibility**<br>**Type**<br>**Part Number**<br>**Mount**<br>**Position***<br>**MCB 489**<br>**MCB 1077**<br>Auxiliary Contact Module<br>**7940099227**<br>Left<br>X<br>X<br>Bell Alarm Contact Module<br>**7940099228**<br>Left<br>X<br>X<br>Shunt Trip Module<br>**7940104512**<br>Left<br>X<br>X<br>**7940099319**<br>Left<br>X<br>X<br>**7940104515**<br>Left<br>X<br>X<br>**7940104511**<br>Left<br>X<br>X<br>**7940104510**<br>Left<br>X<br>X<br>**7940104513**<br>Left<br>X<br>X<br>**7940104514**<br>Left<br>X<br>X<br>*Seen from the front<br>~~—~~<br>z~~re~~|||
|**Bell Alarm**<br>**Bell Alarm**|||



**19** 

Thermal Magnetic Miniature Circuit Breakers 

## Mounting Instructions for the Accessory Modules 

**==> picture [473 x 183] intentionally omitted <==**

**----- Start of picture text -----**<br>
C<br>A<br>B<br>G2 @ F2<br>E<br>F2<br>G1 G1<br>G2<br>D F1 F1<br>**----- End of picture text -----**<br>


## **Preparing the MCB to connect the Auxiliary Contact, Bell Alarm Contact or Shunt Trip Module** 

- Use a small flat screwdriver to remove the clear plastic window (A) on the left side of the MCB (seen from the front). Do not remove the clear plastic window on the right side. 

- Use the same screwdriver to remove the solid plastic cover (B) exposing the mechanical trip mechanism (C) beneath the window. 

- For the MCB 489’s only, slide the top and bottom fins forward and remove (D, E). 

- For the MCB 489’s, using small pliers remove the 2 plastic tabs on the fins (G1) and remove the 2 plugs from the breaker (F1) on the left side only. 

   - For the MCB 1077’s, using small pliers remove the plugs from the breaker (F1). 

   - G2 shows the plastic tabs removed and F2 shows the plugs removed. 

- For the MCB 489’s only, reattach the fins after installing the accessory module(s). 

## **Accessory devices are left hand mounted only (seen from the front).** 

## **Accessories for Branch and Supplementary Circuit Breakers** 

## **Applies to 7940099227, 7940099228 and BST:** 

The accessory modules can be installed on the left side only (seen from the front). 

## **Mounting** 

1. Bring all orange levers of all devices into the “OFF” position 

2. Insert guide pin into the lever handle notch (insertion depth approx. 7 mm) 

3. Combine MCB and 7940099227, 7940099228 or BST as outlined on page 18 

4. Installation is complete when all snap together 

**20** 

Thermal Magnetic Miniature Circuit Breakers 

## **Accessories** 

## Busbar and Busbar Accessories 

## **Busbars UL 489 – cuttable** 

## **Description** 

Busbars for the connection of circuit breakers type MCB489 to UL 489. The busbars of 1 meter length can individually be cut to a suitable length for the application and isolated with end caps. Depending on the control cabinet design, the supply is by means of supply terminals without increasing the installation width or by means of a terminal block directly on the rail without increasing the installation height. 

Three busbar models are available for use with auxiliary contact modules with a width of 9 mm. 

## **How to prepare the cuttable busbar** 

**==> picture [274 x 80] intentionally omitted <==**

**----- Start of picture text -----**<br>
Lock-on, Lock-off Device<br>MCB489 3P C<br>20A ACDC<br>jad r Protective Cap<br>Busbar<br>**----- End of picture text -----**<br>


1.  The busbar can be cut to individually required lengths for maximum flexibility 

2.  After cutting, clean the cut face 

**==> picture [228 x 42] intentionally omitted <==**

**----- Start of picture text -----**<br>
Bottom/Direct<br>Feeder Terminal<br>Endcap<br>Feeder Terminal<br>**----- End of picture text -----**<br>


3.  Attach an end cap for maximum finger safety 

## **Technical Data** 

|**Part Number**|**No. of Poles**|**No. of Devices**|**No. of Pins**<br>**Cross Section**|**Max. Amperage**|**Max. Voltage**<br>**Pitch**|
|---|---|---|---|---|---|
|7940099236|1|57|57||1000 V AC/DC|
|7940099238|2|28|56||600 V AC/DC|
|7940104509|3|19|57||600 V AC/DC|
||||18 mm2|80 A|17.6 mm|
|7940099235*|1|37|37||1000 V AC/DC|
|7940104506**|2|23|46||600 V AC/DC|
|7940104508***|3|16|48||600 V AC/DC|
|*,**,***See Ordering Data||||||



|**Voltage Ratings**|**Single Phase**|**2 and 3 Phase**|
|---|---|---|
|Max. AC Voltage|1000 V AC|600 V AC|
|Max. DC Voltage|1000 V DC|600 V DC|
|Current Ratings|End Feed|Center Feed|
|Max. Current 18 mm2Cross Section|80 A|160 A†|
|Protection Class|IP20||
|kA Rating(J Fuse)|14kA||



†Note: Two 115 A Feeder Terminals required per phase 

**21** 

Thermal Magnetic Miniature Circuit Breakers 

## **Ordering Data** 

|**No. of Poles**<br>**No. of**<br>**Devices**<br>**No. of**<br>**Pins**<br>**Description**<br>1-Pole<br>12<br>12<br>MCB BUS BAR UL489<br>1 POLE 12 PIN<br>18<br>18<br>MCB BUS BAR UL489<br>1 POLE 18 PIN<br>57<br>57<br>MCB BUS BAR UL489<br>1 POLE 57 PIN|**Part Number**<br>**7940099234**<br>**7940104504**<br>**7940099236**|
|---|---|
|2-Pole<br>6<br>12<br>MCB BUS BAR UL489|**7940099237**|
|2 POLE 12 PIN||
|9<br>18<br>MCB BUS BAR UL489|**7940104505**|
|2 POLE 18 PIN||
|28<br>56<br>MCB BUS BAR UL489|**7940099238**|
|2 POLE 56 PIN<br>3-Pole<br>4<br>12<br>MCB BUS BAR UL489<br>3 POLE 12 PIN<br>6<br>18<br>MCB BUS BAR UL489<br>3 POLE 18 PIN<br>19<br>57<br>MCB BUS BAR UL489|**7940099239**<br>**7940104507**<br>**7940104509**|
|3 POLE 57 PIN||
|*1-Pole with Auxiliary<br>37<br>37<br>MCB BUS BAR UL489|**7940099235**|
|Module Spacing<br>1 POLE 37 PIN AUX||
|**2-Pole with Auxiliary<br>23<br>46<br>MCB BUS BAR UL489|**7940104506**|
|Module Spacing<br>2 POLE 46 PIN AUX<br>***3-Pole with Auxiliary<br>Module Spacing<br>16<br>48<br>MCB BUS BAR UL489<br>3 POLE 48 PIN AUX<br>**7940104508**<br>~~——~~||
|**Accessories for Busbars UL 489**||
|**Description**<br>**Part Number**<br>Feeder Terminal, UL 489, 115 A<br>**7940099232**<br>**Description**<br>**Part Number**<br>~~———_~~||
|Bottom/Direct Feeder Terminal, UL 489, 115 A|**7940099233**|
|**Description**<br>**Part Number**<br>**Description**<br>**Part Number**<br>Endcap for UL 489 Cuttable Busbar<br>**7940099230**<br>~~——_~~||
|**Description**<br>**Part Number**<br>Lock-on, Lock-off Device<br>**7940099734**<br>Protective Cap for UL 489 cuttable busbar, 3 caps per bar<br>**7940099230**<br>~~—~~||



**Feeder Terminal** 

**Bottom/Direct Feeder Terminal** 

**Endcap** 

**==> picture [85 x 183] intentionally omitted <==**

**----- Start of picture text -----**<br>
Protective Cap<br>*<br>(lt!<br>Lock-on, Lock-off<br>Device<br>**----- End of picture text -----**<br>


**22** 

Thermal Magnetic Miniature Circuit Breakers 

## **Busbars UL 1077 – cuttable** 

## **Description** 

Busbars for the connection of circuit breakers type MCB1077 to UL 1077. The busbars of 1 meter length can individually be cut to a suitable length for the application and isolated with end caps. Depending on the control cabinet design, the supply is by means of supply terminals without increasing the installation width or by means of a terminal block directly on the rail without increasing the installation height. 

Three busbar models are available for use with auxiliary contact modules with a width of 9 mm. 

## **How to prepare the cuttable busbar** 

1.  Use a saw to cut the busbar to the desired length 

2.  Slide the copper bars 

**==> picture [288 x 191] intentionally omitted <==**

**----- Start of picture text -----**<br>
Feeder Terminal<br>Protective Cap<br>Busbar<br>Lock-on, Lock-off Device i _ ee a Endcap<br>MCB1077 3P C<br>. "Se > e oe<br>20A ACDC<br>S ¥<br>Bottom/Direct<br>Feeder Terminal<br>**----- End of picture text -----**<br>


- from the insulation and cut back the bars for proper end clearances 

3.  Deburr the edges 

4.  Use a stiff brush or compressed air to remove any copper or plastic filings and reassemble the busbar 

## **Technical Data** 

|**Technical Data**|||
|---|---|---|
|**Voltage Ratings**|**Single Phase**|**2 and 3 Phase**|
|Max. AC Voltage|1000 V AC|600 V AC|
|Max. DC Voltage|1000 V DC|600 V DC|
|Current Ratings<br>~~a~~|End Feed<br>~~a~~|Center Feed<br>~~a~~|
|Max. Current 18 mm2Cross Section|80 A|160 A†|
|Protection Class|IP20||
|kA Rating(J Fuse)|14kA||



5.  Attach endcaps Note: For safety purposes, all shortened busbars need to be covered with suitable endcaps 

†Note: Two 115 A Feeder Terminals required per phase 

**23** 

Thermal Magnetic Miniature Circuit Breakers 

## **Ordering Data** 

||**No. of Poles**|**No. of**<br>**Devices**|**No. of**<br>**Pins**|**Description**|**Part Number**|**Part Number**|||
|---|---|---|---|---|---|---|---|---|
||1-Pole|12|12|MCB BUS BAR UL1077|MCB BUS BAR UL1077<br>**7940099008**||||
|||||1 POLE 12 PIN|||||
|||18|18|MCB BUS BAR UL1077|MCB BUS BAR UL1077<br>**7940104908**||||
|||||1 POLE 18 PIN|||||
|||57|57|MCB BUS BAR UL1077|MCB BUS BAR UL1077<br>**7940104909**||||
|||||1 POLE 57 PIN|||||
||2-Pole|6|12|MCB BUS BAR UL1077|MCB BUS BAR UL1077<br>**7940099133**||||
|||||2 POLE 12 PIN|||||
|||9|18|MCB BUS BAR UL1077|MCB BUS BAR UL1077<br>**7940099417**||||
|||||2 POLE 18 PIN|||||
|||28|56|MCB BUS BAR UL1077|MCB BUS BAR UL1077<br>**7940104910**||||
|||||2 POLE 56 PIN|||||
||3-Pole<br>1-Pole with Auxiliary<br>Module Spacing<br>2-Pole with Auxiliary|4<br>6<br>19<br>37<br>23|12<br>18<br>57<br>37<br>46|MCB BUS BAR UL1077<br>3 POLE 12 PIN<br>MCB BUS BAR UL1077<br>3 POLE 18 PIN<br>MCB BUS BAR UL1077<br>3 POLE 57 PIN<br>MCB BUS BAR UL1077<br>1 POLE 37 PIN AUX<br>MCB BUS BAR UL1077|MCB BUS BAR UL1077<br>**7940099195**<br>MCB BUS BAR UL1077<br>**7940104912**<br>MCB BUS BAR UL1077<br>**7940099418**<br>MCB BUS BAR UL1077<br>**7940099415**<br>MCB BUS BAR UL1077<br>**7940104911**||**1P Top Feed**<br>**Terminal**<br>BH|**2/3P Top Feed**<br> &.|
||Module Spacing|||2 POLE 46 PIN AUX|||||
||3-Pole with Auxiliary|16|48|MCB BUS BAR UL1077|MCB BUS BAR UL1077<br>**7940104913**||||
|Module Spacing<br>3 POLE 48 PIN AUX<br>**Top Feed Terminal**<br>**Description**<br>**Part Number**<br>~~ee~~e|||||||||
||MCB BUS BAR UL1077 1P TERM TOP FEED||||**7940104937**||||
||MCB BUS BAR UL1077 2/3P TERM TOP FEED||||**7940099078**||**Bottom/Direct**|**Bottom/Direct**|



BH **1P Top Feed** &. **2/3P Top Feed Terminal Terminal** 

**Bottom/Direct Feeder Terminal** 

## **Bottom/Direct Feeder Terminal** 

**Description Part Number** MCB BUS BAR UL1077 1/2/3P TERM BOT FEED **7940099453** ~~eee~~ & **Endcap Endcap Description Part Number** MCB BUS BAR UL1077 1P END CAP **7940099060** MCB BUS BAR UL1077 2/3P END CAP **7940099223** ~~So~~ **Protective Cap Protective Cap Description Part Number** MCB BUS BAR UL1077 BUS CAP YEL (5 caps) **7940099216 Lock-on, Lock-off Device** ~~—___.~~ **Description Part Number Lock-on, Lock-off** Lock-on, Lock-off Device **7940099734** 

**==> picture [73 x 112] intentionally omitted <==**

**----- Start of picture text -----**<br>
Protective Cap<br>Lock-on, Lock-off<br>Device<br>**----- End of picture text -----**<br>


**24** 

Thermal Magnetic Miniature Circuit Breakers 

## **Glossary** 

Weidmuller MCB489 and MCB1077 Series breakers are UL tested and certified as current limiting protective devices. Current limiting circuit breakers provide a higher level of circuit protection than a typical zero point external breakers. 

## **Ampere Rating** 

A rating of the amount of current a protective device will carry continuously without deteriorating or exceeding temperature rise limits. 

## **Arc** 

The effect generated when electrical current bridges the air gap between two conductors that are not touching. 

## **Branch Circuit** 

The conductor and components following the last over-current protective device protecting a load. 

## **Circuit Breaker** 

A device designed to open and close a circuit by non-automatic means, and to open the circuit automatically on a pre-determined overcurrent, without damage to itself when properly applied within its rating. 

## **Current Limiting** 

A type of supplementary protector which limits the amount of damaging short circuit current. 

## **DIN-Rail** 

A solidly mounted, rail-type device to which any number of circuit breakers can be mounted. 

## **Double Pole** 

Term used to describe a breaker that draws power from two poles of a load center or similar device. 

## **Frame** 

A component of a miniature circuit breaker. Its primary function is to provide a rigid, mechanically strong, insulated housing in which the other components are mounted. 

## **IEC** 

Abbreviation for International Electrotechnical Commission. This organization is associated with equipment used internationally. 

## **IEC 60947-2 Current Limiting Circuit Breaker** 

A circuit breaker with sufficiently short trip time to prevent the short circuit current from reaching the peak value which would otherwise be reached. 

## **Interrupting Rating** 

The highest current, at rated voltage, that a device is intended to interrupt under standard test conditions. 

## **Let-through Current** 

The maximum instantaneous or peak current which passes through a protective device. 

## **Load Center** 

A device that delivers electricity from a supply source to loads in light commercial or residential applications. 

## **NEC** 

Abbreviation for National Electrical Code. A standard for applying electrical equipment in the United States. 

## **NEC240.2 Current Limiting** 

A device that, when interrupting current in its current-limiting range, reduces the current flowing in the faulted circuit to a magnitude substantially less than that obtainable in the same circuit if the device were replaced with a solid conductor having comparable impedance. 

## **Operating Mechanism** 

A component of a miniature circuit breaker. Its function is to provide the means of opening and closing the circuit. 

## **Overcurrent Protective Device** 

A device such as a circuit breaker or fuse. In the event of an overload or short circuit, this device will quickly terminate power to the circuit. 

## **Overload (or Overcurrent)** 

A condition in which current is in excess of the normal load being drawn. 

## **Short Circuit** 

An electrical fault created when two exposed conductors touch. 

## **Single Pole** 

Term used to describe a breaker that draws power from one pole of a load center or similar device. 

## **Supplementary Protector** 

A device similar in function to a miniature circuit breaker, but not UL approved as a circuit breaker. Used in conjunction with circuit breakers. 

## **Thermal Magnetic** 

The predominant trip unit technology used in the domestic market. A bimetal and an electromagnet work together to provide overload and short circuit protection. 

## **UL AC 60Hz Cycle** 

UL defines an AC cycle as the potential energy of the wave form traveling from Zero-to-Positive amplitude, Positive-to-Zero amplitude, Zero-to-Negative amplitude, Negative-to-Zero amplitude 60 times in one second. One cycle is completed every 16.6 milliseconds. 

## **UL Breaker Current Limiting** 

UL defines breaker current limitation as a breaker that interrupts and isolates a fault in less than half of an AC cycle. Half a cycle is completed in 8.3 milliseconds **.** 

## **Withstand Rating** 

The maximum current that an unprotected electrical component can sustain for a specific period of time without the occurrence of extensive damage. 

## **Miniature Circuit Breaker (MCB)** 

A specific type of circuit breaker, used to switch and protect the lowest common distribution voltage in an electrical system. Generally used in a load center, panelboard or similar device. 

**25** 

Thermal Magnetic Miniature Circuit Breakers 

## **Additional Technical Information** 

## Operation and Components of MCB489 and MCB1077 ACDC Series 

During normal operation and the MCB switch engaged, current flows in the line side terminal to a bimetallic strip, moving contact, fixed contact, current coil (magnetic trip coil) and out the load side terminal to complete a series path. 

The MCB enclosure housing is a molded plastic material. This provides mechanical strength and insulation from the components inside. The switching system consists of a fixed and a moving contact plate to which incoming and outgoing conductors are connected. The current carrying components are made up of various metallic compounds depending on the rating of the circuit breaker. 

The orange lever is used to manually engage/disengage the contact under normal ON/OFF conditions, as well as indicate status of the device. It also allows manual RESET of the latch after an overload or short circuit event. 

The thermal overload configuration for the slow rising current over time consists of a strip of bimetal (two dissimilar metals). The rise in current causes a rise in temperature. The heat generated within the bimetal itself is enough to cause deflection due to thermal expansion of the dissimilar metals. This deflection further releases the trip latch mechanism and the contact faces separate. 

The magnetic tripping configuration for short circuit conditions consists of a system that allow fast rise time current (too fast for the bimetal) to separate the contact faces using a spring loaded plunger. The current carrying coil in this trip configuration moves the plunger when a strong magnetic field produced by the coils releasing the plunger engaging the trip latch mechanism. 

From the action of the fixed and moving contact faces separating in the event of an overload or short circuit situation, an electric arc in air is formed. The UC Series is designed to handle the arc interruption process where arc energy extraction and its cooling are provided by the arc runner and parallel arc splitter plates called the arc chute. These plates are held in position by the housing material. The operating mechanism consists of both magnetic tripping and thermal tripping arrangements. 

**==> picture [497 x 223] intentionally omitted <==**

**----- Start of picture text -----**<br>
Lever<br>Manual Switch<br>Trip Latch<br>Magnetic Coil<br>Fixed Contact<br>Plunger<br>Thermal Bimetal<br>= Line Side Terminal<br>Load Side Terminal eee ae<br>Moving Contact<br>Arc Chute Arc Runner<br>**----- End of picture text -----**<br>


**26** 

Thermal Magnetic Miniature Circuit Breakers 

## Weidmuller ACDC Series Thermal Magnetic Definition 

## **Thermal Overload** 

A thermal overload is a slow and small overcurrent situation that causes the ampacity and temperature of the circuit to gradually increase. This type of event is characterized by a slight increase in the load (ampacity) on the circuit and is interrupted by the thermal trip unit of the breaker. 

- **Thermal** Region of the trip curve representing the tripping characteristics of the bimetal trip unit. The tripping region is sloped due to the gradual overload, heating, and bending nature of the thermal element over time. 

## **Short Circuit** 

A short circuit is an intense overcurrent situation that causes the ampacity of the circuit to increase. This type of event is characterized by a dramatic increase in the load (ampacity) on the circuit and is interrupted by the magnetic trip unit of the breaker. 

- **Magnetic** Region of the trip curve representing the tripping characteristics of the magnetic trip unit. The tripping region is not sloped due to the instantaneous nature of the magnetic element during a short circuit. 

MCBs’ tripping characteristics are represented graphically in a trip curve chart. The chart shows the response of the thermal and magnetic trip element to various overload and short circuit situations. 

## **Time/Current Characteristics** 

**==> picture [260 x 266] intentionally omitted <==**

**----- Start of picture text -----**<br>
10000<br>1000<br>100<br>10 Thermal<br>Area either event will trip CB<br>1<br>Magnetic<br>0.1<br>0.01<br>0.8 1 2 4 6 8 10 20 40<br>...times rated current<br>Trip time in seconds<br>**----- End of picture text -----**<br>


**27** 

Thermal Magnetic Miniature Circuit Breakers 

## Examples of Trip Curve Interpretation — Reading Trip Curves 

## _**Example 1: Thermal Tripping Characteristic**_ 

## **10 Amp B Curve Breaker** 

## **Thermal Overload at 20 Amps** 

To determine the time it takes for the breaker to trip with a 20 A load: 

- Find 20 A on the bottom of the curve –10 A breaker at 2X current is 20 A 

- Follow the ampacity line up to the “time” tripping region of the curve. 

The breaker will trip under a thermal overload in the area between where 20 A intersects the bottom curve line and the intersection of the top curve. The breaker is guaranteed to trip in this time bandwidth. 

## _**Example 2: Magnetic Tripping Characteristic**_ 

## **10 Amp B Curve Breaker** 

## **Short Circuit at 70 Amps** 

To determine the time it takes for the breaker to trip with a 70 A short circuit: 

- Find 70 A on the bottom of the curve –10 A breaker at 7X current is 70 A 

- Notice the “time” at the bottom left corner of the chart axis. 

The breaker is guaranteed to trip no later than .01 seconds for any short circuit equal to 70 A. 

**==> picture [197 x 253] intentionally omitted <==**

**----- Start of picture text -----**<br>
10000<br>1000<br>100<br>Time Bandwidth<br>10<br>1<br>0,1<br>0,01<br>0,8 1 2 4 6 8 10 20 40<br>...times rated current<br>Trip time in seconds<br>**----- End of picture text -----**<br>


**==> picture [173 x 253] intentionally omitted <==**

**----- Start of picture text -----**<br>
10000<br>1000<br>100<br>10<br>1<br>0,1<br>0,01<br>0,8 1 2 4 6 8 10 20 40<br>70 ...times rated current<br>Trip time in seconds<br>**----- End of picture text -----**<br>


**28** 

Thermal Magnetic Miniature Circuit Breakers 

## Ambient Temperature Derating 

## **Maximum operating currents depending on ambient temperature** 

**==> picture [542 x 27] intentionally omitted <==**

**----- Start of picture text -----**<br>
Rated current Max. operating currents depending on ambient temperature T (A)<br>IN (A) -35°C -30°C -25°C -20°C -15°C -10°C -5°C 0°C +5°C +10°C +15°C<br>**----- End of picture text -----**<br>


|<br>**IN (A)**<br>|<br> <br>**-35°C**<br>|<br>**-30°C**<br>|<br>**-25°C**<br>|<br>**-20°C**<br>|<br>**-15°C**<br>|<br>**-10°C**<br>|**-5°C**<br>|**0°C**<br>|**+5°C**<br>|**+10°C**<br>|**+15°C**<br>|
|---|---|---|---|---|---|---|---|---|---|---|---|
|1|1.27|1.25|1.23|1.21|1.19|1.17|1.15|1.13|1.10|1.08|1.06|
|2|2.87|2.81|2.74|2.68|2.62|2.55|2.48|2.42|2.35|2.28|2.20|
|3|3.89|3.83|3.76|3.70|3.64|3.57|3.50|3.44|3.37|3.30|3.22|
|4|4.91|4.83|4.76|4.70|4.64|4.57|4.50|4.44|4.37|4.30|4.22|
|5|6.68|6.56|6.44|6.32|6.19|6.07|5.94|5.81|5.68|5.54|5.40|
|6|7.70|7.58|7.46|7.34|7.21|7.09|6.96|6.83|6.70|6.56|6.42|
|7|8.78|8.66|8.54|8.42|8.29|8.17|8.04|7.91|7.78|7.64|7.50|
|8|9.80|9.68|9.56|9.44|9.31|9.19|9.06|8.93|9.80|8.66|8.52|
|10|13.89|13.62|13.35|13.07|12.81|12.53|12.23|11.93|11.63|11.33|11.01|
|12|15.91|15.64|15.37|15.09|14.83|14.55|14.25|13.95|13.65|13.35|13.03|
|13|16.92|16.65|16.38|16.10|15.84|15.56|15.26|14.96|14.66|14.36|14.04|
|15|19.77|19.42|19.07|18.74|18.39|18.04|17.69|17.32|16.95|16.57|16.19|
|16|20.78|20.43|20.08|19.75|19.40|19.05|18.70|18.33|17.96|17.58|17.20|
|20|25.67|25.28|24.88|24.47|24.06|23.64|23.22|22.78|22.34|21.89|21.43|
|25|32.21|31.72|31.22|30.70|30.18|29.65|29.10|28.55|27.98|27.41|26.82|
|30|39.00|38.42|37.78|37.13|36.47|35.80|35.11|34.43|33.71|32.99|32.26|
|32|41.04|40.46|39.82|39.17|38.51|37.84|37.15|36.47|35.75|35.03|34.30|
|35|44.08|43.50|42.86|42.21|41.55|40.88|40.19|39.51|38.79|38.07|37.34|
|40|51.63|50.86|50.04|49.21|48.37|47.51|46.63|45.74|44.83|43.90|42.95|
|50|64.92|63.97|62.92|61.86|60.77|59.67|58.54|57.40|56.23|55.05|53.81|
|60|80.45|79.03|77.61|76.16|74.69|73.19|71.67|70.11|68.51|66.88|65.21|
|63|83.48|82.06|80.71|79.19|77.72|76.22|74.70|73.14|71.54|69.91|68.24|



**==> picture [542 x 27] intentionally omitted <==**

**----- Start of picture text -----**<br>
Rated current Max. operating currents depending on ambient temperature T (A)<br>IN (A) +20°C +25°C +30°C +35°C +40°C +45°C +50°C +55°C +60°C +65°C +70°C<br>**----- End of picture text -----**<br>


|1|1.05|1.02|1.00|0.97|0.94|0.91|0.89|0.86|0.83|0.80|0.77|
|---|---|---|---|---|---|---|---|---|---|---|---|
|2|2.12|2.04|2.00|1.90|1.82|1.74|1.65|1.56|1.47|1.36|1.25|
|3|3.14|3.06|3.00|2.92|2.84|2.76|2.67|2.58|2.49|2.38|2.27|
|4|4.14|4.06|4.00|3.92|3.84|3.76|3.67|3.58|3.49|3.38|3.27|
|5|5.25|5.12|5.00|4.82|4.66|4.50|4.34|4.17|3.99|3.81|3.62|
|6|6.27|6.14|6.00|5.84|5.68|5.52|5.36|5.19|5.01|4.83|4.64|
|7|7.35|7.22|7.00|6.92|6.76|6.60|6.44|6.27|6.09|5.91|5.72|
|8|8.37|8.24|8.00|7.94|7.78|7.62|7.46|7.29|7.11|6.93|6.74|
|10|10.67|10.34|10.00|9.63|9.24|8.85|8.45|8.01|7.55|7.06|6.55|
|12|12.69|12.36|12.00|11.65|11.26|10.60|10.47|10.03|9.57|9.08|8.57|
|13|13.70|13.37|13.00|12.66|12.27|11.61|11.48|11.04|10.58|10.09|9.58|
|15|15.79|15.39|15.00|14.54|14.10|13.65|13.19|12.70|12.20|11.69|11.64|
|16|16.80|16.40|16.00|15.55|15.11|14.66|14.20|13.71|13.21|12.70|12.65|
|20|20.96|20.47|20.00|19.47|18.95|18.42|17.87|17.30|16.71|16.10|15.47|
|25|26.22|25.61|25.00|24.33|23.67|23.00|22.28|21.56|20.80|20.02|19.21|
|30|31.50|30.73|30.00|29.13|28.30|27.44|26.56|25.65|24.71|23.74|22.73|
|32|33.54|32.77|32.00|31.17|30.34|29.48|28.69|27.69|26.75|25.78|24.77|
|35|36.58|35.81|35.00|34.21|33.38|32.52|31.64|30.73|29.79|28.82|27.81|
|40|41.98|40.99|40.00|38.93|37.85|36.75|35.61|34.43|33.21|31.95|30.63|
|50|52.56|51.28|50.00|47.82|46.24|44.81|43.33|41.81|40.23|38.58|35.77|
|60|63.50|61.75|60.00|57.08|55.16|53.18|51.13|49.00|46.78|44.47|40.47|
|63|66.53|64.78|63.00|60.11|58.19|56.21|54.16|52.03|49.81|47.50|43.50|



**29** 

Thermal Magnetic Miniature Circuit Breakers 

## ACDC Series D Curve Thermal Magnetic Tripping Characteristics vs K Curve 

The K and UC Series D curve breakers are both designed for motor applications where ampacity rises quickly and momentarily during “start-up”. Both curves can “ride through” the momentary inrush of current and prevent nuisance tripping while providing protection to the circuit. 

Both curves have almost identical tripping characteristics. The magnetic element tripping characteristics are identical between the two curves and the thermal element tripping characteristics have a slight variation. 

## **D Curve** 

## _**Thermal Tripping Characteristics Comparison**_ 

- **Example: 10 Amp D Curve Breaker** 

- **Thermal Overload at 20 Amps** 

To determine the time it takes for the breaker to trip with a 20 A load: 

- Find 20 A on the bottom of the curve –10 A breaker at 2X current is 20 A 

- Follow the ampacity line up to the “time” tripping region of the curve. 

The breaker will trip under a thermal overload in the area between where 20 A intersects the bottom curve line (~7.5s) and the intersection of the top curve (~150s). The breaker is guaranteed to trip in this time bandwidth. 

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## **K Curve** 

Similarly the K curve breaker will trip under a thermal overload between 6 and 350 seconds. The breaker is guaranteed to not trip before ~6 seconds and will not take longer than ~350 seconds to trip. The breaker may trip at any time in this time bandwidth. 

**30** 

Thermal Magnetic Miniature Circuit Breakers 

## **D Curve** 

## _**Short Circuit Tripping Characteristics Comparison**_ 

## **Example:** 

## **10 Amp K Curve Breaker and UC Series 10 Amp D Curve Breaker** 

## **Short Circuit at 100 Amps** 

Both breakers have an element that will trip between 10 and 14 times rated current. Both breakers will trip under a short circuit before .01 seconds. And both breakers are guaranteed to trip no later than .01 seconds for any short circuit equal to 100 A or greater. 

## _**K and UC Series D Curve Summary**_ 

## **Thermal Element Minimum Tripping** 

The UC Series D curve MCB will interrupt an overload at 2X rated current in 7.5s or greater. The K curve MCB will interrupt an overload at 2X rated current in 6 seconds or greater. This additional time allows a circuit more time to “ride through” high inrush at start-up and prevent nuisance tripping. 

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**==> picture [38 x 8] intentionally omitted <==**

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K Curve<br>**----- End of picture text -----**<br>


## **Thermal Element Bandwidth** 

The K curve tripping bandwidth at 2X rated current is between 6 and 350 seconds. The UC Series D curve tripping bandwidth at 2X rated current is between 7.5 and 150 seconds. The differences between the bandwidths demonstrate calibration and quality control accuracy. The UC Series D curve breaker from Weidmuller has a much smaller tolerance bandwidth and requires a higher level of adjustment during manufacturing and quality control validation. 

## **Magnetic Element** 

The magnetic element of the K curve and UC Series D curve MCBs are identical. Both breakers interrupt a short circuit at 10X the rated current (or greater) in no later than .01 seconds. 

**31** 

## **Weidmuller – Your partner in Industrial Connectivity** 

As experienced experts we support our customers and partners around the world with products, solutions and services in the industrial environment of power, signal and data. We are at home in their industries and markets and know the technological challenges of tomorrow. We are therefore continuously developing innovative, sustainable and useful solutions for their individual needs. Together we set standards in Industrial Connectivity. 

## **Weidmuller, Canada** 

10 Spy Court Markham, Ontario L3R 5H6 Telephone: (800) 268-4080 Facsimile: (877) 300-5635 orders_can@weidmueller.com www.weidmuller.ca 

## **Weidmuller, Mexico** 

Blvd. Hermanos Serdán 698, Col. San Rafael Oriente Puebla, Puebla, Mexico C.P. 72029 Telephone: 01 222 2686267 Facsimile: 01 222 2686219 clientes@weidmuller.com.mx www.weidmuller.com.mx 

## **Weidmuller, United States** 

821 Southlake Blvd. Richmond, Virginia 23236 Telephone: (800) 849-9343 Facsimile: (804) 379-2593 customerservice@weidmuller.com www.weidmuller.com 

10/22 • LIT1617 R1