# RELAY, AUTOMOTIVE, SPST-NO, 14VDC, 40A

![Product image](https://novapart.co/image/farnell:1867303/)

**URL**: https://novapart.co/products/CB1A-D-12V/relay-automotive-spst-no-14vdc-40a
**SKU**: CB1A-D-12V
**Manufacturer**: PANASONIC
**Category**: Switches & Relays || Relays || Automotive Relays
**Price**: €2.8500
**Stock**: 10+

## Description

; RELAY, AUTOMOTIVE, SPST-NO, 14VDC, 40A; Contact Configuration:SPST-NO; Coil Voltage:12VDC; Contact Current:40A; Product Range:CB Series; Relay Mounting:Through Hole; Relay Termina

## Specifications

| Parameter | Value |
|---|---|
| Svhc | No SVHC (17-Dec-2014) |
| Coil Voltage | 12VDC |
| Product Range | CB Series |
| Relay Mounting | Through Hole |
| Coil Resistance | 103ohm |
| Contact Current | 40A |
| Relay Terminals | Solder |
| Contact Material | Silver Alloy |
| Contact Configuration | SPST-NO |
| Contact Voltage Dc Nom | 14V |

## Datasheet

📄 [Download PDF](https://novapart.co/datasheet/farnell:1867303/)

CB 

## **AUTOMOTIVE RELAY WITH ISO TERMINAL ARRANGEMENT** 

## CB RELAYS 

## **FEATURES** 

## **1. This relay has an ISO (International Organization for Standardization) terminal arrangement.** Terminals are all solder plated. 

*35 A type: Terminal is the plug-in type (no plating). 

## **2. Relay is compact and high capacity (40 A).** 

Compact form factor realized with space saving 22 × 26 mm .866 × 1.024 inch small base area thanks to integrated bobbin and base construction. Features high switching capacity of 40 A 

**3. Features high thermal resistance of 125** ° **C 257** ° **F (heat resistant type).** Heat resistant type is available that can withstand use near engines. (40 A switching capacity) 

**5. Surge absorbing built-in diode type that works when the relay coil is off and an internal resistor type are available. (Please inquire.) 6. Protective element type is also available.** 

**7. For only plug-in types, types with nominal switching capacities of 35 A** 

- **(12 V) and 15 A (24 V) are available.** 

## **TYPICAL APPLICATIONS** 

## **1. Automobiles** 

Headlights, Cell motors, Air conditioners, ABS, EPS, etc. 

## **2. Construction equipment** 

**3. Agricultural equipment, Conveyor, etc.** 

**4. Sealed type available for resisting Compliance with RoHS Directive adverse environments. ORDERING INFORMATION CB** Contact arrangement 1a: 1 Form A 1: 1 Form C Contact rating Nil: Standard type H: High contact capacity type V: 35 A type Protective construction Nil: Sealed type F: Flux-resistant type Heat resistant of types Nil: Standard type T: Heat resistant type Protective element Nil: None D: with diode inside R: with resistor inside ~~=~~ Mounting classification Nil: Plug-in type P: PC board type M: Bracket type Coil voltage (DC) 12V, 24 V 

All Rights Reserved © C OPYRIGHT Panasonic Electric Works Co., Ltd. 

CB 

## **TYPES** 

## **1. Standard type** 

|**TYPES**<br>**1. Standard type**|||||
|---|---|---|---|---|
|Contact arrangement|Mounting classifcation|Nominal coil voltage|Sealed type<br>Part No.|Flux-resistant type<br>Part No.|
||PC board type|12V DC<br>24V DC|CB1a-P-12V<br>CB1a-P-24V|CB1aF-P-12V<br>CB1aF-P-24V|
|||12V DC|CB1a-12V|CB1aF-12V|
|1 Form A|Plug-in type|24V DC|CB1a-24V|CB1aF-24V|
|||12V DC|CB1a-M-12V|CB1aF-M-12V|
||Bracket type|24V DC|CB1a-M-24V|CB1aF-M-24V|
||PC board type|12V DC<br>24V DC|CB1-P-12V<br>CB1-P-24V|CB1F-P-12V<br>CB1F-P-24V|
|1 Form C|Plug-in type|12V DC<br>24V DC|CB1-12V<br>CB1-24V|CB1F-12V<br>CB1F-24V|
|||12V DC|CB1-M-12V|CB1F-M-12V|
||Bracket type|24V DC|CB1-M-24V|CB1F-M-24V|
||PC board type*|12V DC<br>24V DC|CB1aH-P-12V<br>CB1aH-P-24V|CB1aHF-P-12V<br>CB1aHF-P-24V|
|High contact capacity<br>(1 Form A)|Plug-in type|12V DC<br>24V DC|CB1aH-12V<br>CB1aH-24V|CB1aHF-12V<br>CB1aHF-24V|
|||12V DC|CB1aH-M-12V|CB1aHF-M-12V|
||Bracket type|24V DC|CB1aH-M-24V|CB1aHF-M-24V|



Packing quantity; Carton: 50 pcs. Case: 200 pcs. 

Notes: 1. Please use “CB∗∗∗R∗∗” to order built-in resistor type and “CB∗∗∗D∗∗” to order built-in diode type. (Asterisks “∗” should be filled in from parts table.) 2. *Regarding solder, this product is not MIL (Military Standard) compliant. Please evaluate solder mounting by the actual equipment before using. 

## **2. Heat resistant type** 

|Contact arrangement|Mounting classifcation|Nominal coil voltage|Sealed type<br>Part No.|Flux-resistant type<br>Part No.|
|---|---|---|---|---|
||PC board type|12V DC<br>24V DC|CB1a-T-P-12V<br>CB1a-T-P-24V|CB1aF-T-P-12V<br>CB1aF-T-P-24V|
|||12V DC|CB1a-T-12V|CB1aF-T-12V|
|1 Form A|Plug-in type|24V DC|CB1a-T-24V|CB1aF-T-24V|
|||12V DC|CB1a-T-M-12V|CB1aF-T-M-12V|
||Bracket type|24V DC|CB1a-T-M-24V|CB1aF-T-M-24V|
||PC board type|12V DC<br>24V DC|CB1-T-P-12V<br>CB1-T-P-24V|CB1F-T-P-12V<br>CB1F-T-P-24V|
|1 Form C|Plug-in type|12V DC<br>24V DC|CB1-T-12V<br>CB1-T-24V|CB1F-T-12V<br>CB1F-T-24V|
|||12V DC|CB1-T-M-12V|CB1F-T-M-12V|
||Bracket type|24V DC|CB1-T-M-24V|CB1F-T-M-24V|
||PC board type*|12V DC<br>24V DC|CB1aH-T-P-12V<br>CB1aH-T-P-24V|CB1aHF-T-P-12V<br>CB1aHF-T-P-24V|
|High contact capacity<br>(1 Form A)|Plug-in type|12V DC<br>24V DC|CB1aH-T-12V<br>CB1aH-T-24V|CB1aHF-T-12V<br>CB1aHF-T-24V|
|||12V DC|CB1aH-T-M-12V|CB1aHF-T-M-12V|
||Bracket type|24V DC|CB1aH-T-M-24V|CB1aHF-T-M-24V|



Packing quantity; Carton: 50 pcs. Case: 200 pcs. 

Notes: 1. Please use “CB∗∗∗R∗∗” to order built-in resistor type and “CB∗∗∗D∗∗” to order built-in diode type. (Asterisks “∗” should be filled in from parts table.) 2. *Regarding solder, this product is not MIL (Military Standard) compliant. Please evaluate solder mounting by the actual equipment before using. 

## **3. 35 A type (*Terminals are all of the plug-in type.)** 

|Contact arrangement|Nominal coil voltage|Sealed type<br>Part No.|Flux-resistant type<br>Part No.|
|---|---|---|---|
||12V DC|CB1aV-12V|CB1aVF-12V|
|1 Form A|24V DC|CB1aV-24V|CB1aVF-24V|
|1 Form C|12V DC<br>24V DC|CB1V-12V<br>CB1V-24V|CB1VF-12V<br>CB1VF-24V|
||12V DC|CB1aV-R-12V|CB1aVF-R-12V|
|1 Form A with resistor inside|24V DC|CB1aV-R-24V|CB1aVF-R-24V|
|1 Form C with resistor inside|12V DC<br>24V DC|CB1V-R-12V<br>CB1V-R-24V|CB1VF-R-12V<br>CB1VF-R-24V|
||12V DC|CB1aV-D-12V|CB1aVF-D-12V|
|1 Form A with diode inside|24V DC|CB1aV-D-24V|CB1aVF-D-24V|
|1 Form C with diode inside|12V DC<br>24V DC|CB1V-D-12V<br>CB1V-D-24V|CB1VF-D-12V<br>CB1VF-D-24V|



Packing quantity; Carton: 50 pcs. Case: 200 pcs. 

All Rights Reserved © C OPYRIGHT Panasonic Electric Works Co., Ltd. 

CB 

## **RATING** 

## **1. Coil data** 

1) 1. No protective element and with diode inside 

|Contact<br>arrangement|Nominal coil<br>voltage|Pick-up voltage<br>(Initial, at 20°C68°F)|Drop-out voltage<br>(Initial, at 20°C68°F)|Nominal operating<br>current<br>(at 20°C68°F)|Coil resistance<br>(±10%)<br>(at 20°C68°F)|Nominal operating<br>power<br>(at 20°C68°F)|Usable voltage<br>range|
|---|---|---|---|---|---|---|---|
|1 Form A,|12V DC|3 to 7V DC|1.2 to 4.2V DC|117mA|103Ω|1.4W|10 to 16V DC|
|1 Form C|24V DC|6 to 14V DC|2.4 to 8.4V DC|75mA|320Ω|1.8W|20 to 32V DC|
|High contact|12V DC|3 to 7V DC|1.2 to 4.2V DC|117mA<br>150mA|103Ω<br>80Ω|1.4W (PC board type)<br>1.8W|10 to 16V DC|
|capacity<br>(1 Form A)|24V DC|6 to 14V DC|2.4 to 8.4V DC|58mA|411Ω|1.4W (PC board type)|20 to 32V DC|
|||||75mA|320Ω|1.8W||



Note: Other pick-up voltage types are also available. Please contact us for details. 

## 2) With resistor inside 

|Contact<br>arrangement|Nominal coil<br>voltage|Pick-up voltage<br>(Initial, at 20°C68°F)|Drop-out voltage<br>(Initial, at 20°C68°F)|Nominal operating<br>current<br>(at 20°C68°F)|Combined resistance<br>(±10%)<br>(at 20°C68°F)|Nominal operating<br>power<br>(at 20°C68°F)|Usable voltage<br>range|
|---|---|---|---|---|---|---|---|
|1 Form A,|12V DC|3 to 7V DC|1.2 to 4.2V DC|134mA|89.5Ω|1.6W|10 to 16V DC|
|1 Form C|24V DC|6 to 14V DC|2.4 to 8.4V DC|84mA|287.2Ω|2.0W|20 to 32V DC|



## **2. Specifications** 

## 1) Standard type (12 V coil voltage) 

|Characteristics|Item||Specifcations|
|---|---|---|---|
|Contact|Arrangement<br>Contact resistance (Initial)|1 Form A|1 Form C<br>High contact capacity<br>(1 Form A)<br>Typ2mΩ(By voltage drop 6 V DC 1 A)|
||Contact material||Ag alloy (Cadmium free)|
||Nominal switching capacity (Initial)|40A 14V DC|N.O.: 40A 14V DC<br>N.C.: 30A 14V DC<br>70A 14V DC (at 20°C68°F)<br>50A 14V DC (at 85°C185°F)|
|Rating|Max. carrying current (Initial)<br>(14V DC, at 85°C185°F, continuous)|N.O.: 40A|N.O.: 40A, N.C.: 30A<br>N.O.: 40A|
||Nominal operating power|1.4W|1.4W<br>1.8W (1.4W: PC board type)|
||Min. switching capacity*1||1A 12V DC (12V DC), 1A 24V DC (24V DC)|
||Initial insulation resistance||Min. 20 MΩ(at 500 V DC)|
||Initial breakdown<br>Between open contacts||500 Vrms for 1 min. (Detection current: 10mA)|
|Electrical|voltage<br>Between contacts and coil||500 Vrms for 1 min. (Detection current: 10mA)|
|characteristics|Operate time (at nominal voltage)<br>(at 20°C68°F)|Max. 15ms (at 20°C68°F, excluding contact bounce time) (Initial)||
||Release time (at nominal voltage)<br>(at 20°C68°F)|Max. 15ms|(at 20°C68°F, excluding contact bounce time, without diode) (Initial)|
|Mechanical|Shock resistance<br>Functional<br>Destructive||Min. 200 m/s2{20G}<br>Min. 1,000 m/s2{100G}|
|characteristics|Vibration<br>Functional||10 Hz to 500 Hz, Min. 44.1m/s2{4.5G}|
||resistance<br>Destructive|10 Hz to 2,000 Hz, Min. 44.1m/s2{4.5G}   Time of vibration for each direction; X. Y. Z direction: 4 hours||
|Expected life|Electrical (at nominal switching capacity)<br>Mechanical|Flux-resistant type: Min. 105, Sealed type: Min. 5×104(Operating frequency: 2s ON, 2s OFF)<br>Min. 106(at 120 cpm)||
|||Standard type; Ambient temp: –40 to +85°C–40 to +185°F,||
||Conditions for operation, transport and|Humidity: 5 to 85% R.H. (Not freezing and condensing at low temperature)||
|Conditions|storage*2|Heat resistant type; Ambient temp: –40 to +125°C–40 to +257°F,||
||||Humidity: 5 to 85% R.H. (Not freezing and condensing at low temperature)|
||Max. operating speed||15 cpm (At nominal switching capacity)|
|Unit weight|||Approx. 33 g1.16 oz|



Notes: *1. This value can change due to the switching frequency, environmental conditions, and desired reliability level, therefore it is recommended to check this with the actual load. 

*2. The upper operation ambient temperature limit is the maximum temperature that can satisfy the coil temperature rise value. Refer to Conditions for operation, transport and storage mentioned in AMBIENT ENVIRONMENT. 

## 2) Standard type (24 V coil voltage) 

|Characteristics|Item|||Specifcations||
|---|---|---|---|---|---|
|Contact|Arrangement<br>Contact resistance (Initial)|1 Form A|1 Form C<br>High contact capacity<br>(1 Form A)<br>Max. 15mΩ(By voltage drop 6 V DC 1 A)|||
||Contact material|||Ag alloy (Cadmium free)||
||Nominal switching capacity (Initial)|20A 28V DC||N.O.: 20A 28V DC<br>N.C.: 10A 28V DC|20A 28V DC|
|Rating|Max. carrying current (Initial)<br>(28V DC, at 85°C185°F, continuous)|20A||N.O.: 20A, N.C.: 10A|20A|
||Nominal operating power|1.8W||1.8W|1.8W, 1.4W (PC board type)|



Note: All other specifications are the same as those of standard type (12 V coil voltage) 

All Rights Reserved © C OPYRIGHT Panasonic Electric Works Co., Ltd. 

CB 

## 3) Heat resistant type (12 V and 24 V coil voltage) 

|Characteristics||Item||||Specifcations|Specifcations|||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|||||12V||||||24V||
||||||High contact||||||High contact|
||Arrangement||1 Form A|1 Form C|capacity||1|Form A||1 Form C|capacity|
|Contact|||||(1 Form A)||||||(1 Form A)|
||Contact|resistance (Initial)|||Max. 15mΩ(By voltage drop 6 V DC 1 A)|||||||
||Contact|material|||Ag alloy (Cadmium|||free)||||
||Nominal<br>(Initial)|switching capacity|40A 14V DC|N.O.: 40A 14V DC<br>N.C.: 30A 14V DC|40A 14V DC||20A 28V DC|||N.O.: 20A 28V DC<br>N.C.: 10A 28V DC|20A 28V DC|
|Rating|Max. carrying current (Initial)<br>(at 85°C185°F, continuous)*||50A 14V DC|N.O.: 50A 14V DC<br>N.C.: 30A 14V DC|45A<br>14V DC|50A<br>14V DC|25A 28V DC|||N.O.: 25A 28V DC<br>N.C.: 10A 28V DC|25A 28V DC|
|||||||1.4W|||||1.8W,|
||Nominal|operating power|1.4W|1.4W|1.8W|(PC board||1.8W||1.8W|1.4W|
|||||||type)|||||(PC board type)|



Notes: 1. All other specifications are the same as those of standard type (12 V coil voltage) 2. *Current value in which carry current is possible when the coil temperature is 180°C 356°F 

## 4) 35 A type (12 V coil voltage) 

|Characteristics|Item|Specifcations|
|---|---|---|
||Arrangement|1 Form A<br>1 Form C|
|Contact|Contact resistance (Initial)|Typ2mΩ(By voltage drop 6 V DC 1 A)|
||Contact material|Ag alloy (Cadmium free)|
||Nominal switching capacity (Resistive load)|35A 14V DC<br>N.O.: 35A 14V DC, N.C.: 25A 14V DC|
|Rating|Max. carrying current (Initial)<br>(14V DC, at 85°C185°F, continuous)|N.O.: 35A<br>N.O.: 35A, N.C.: 25A|
||Nominal operating power|1.4W, 1.6W (with resistor inside)|
||Min. switching capacity (Reference value)*|1A 12V DC (12V DC), 1A 24V DC (24V DC)|
||Initial insulation resistance|Min. 20 MΩ(at 500 V DC)|
||Initial breakdown<br>Between open contacts|500 Vrms for 1 min. (Detection current: 10mA)|
|Electrical<br>characteristics|voltage<br>Between contacts and coil|500 Vrms for 1 min. (Detection current: 10mA)|
||Operate time (at nominal voltage)|Max. 15ms (excluding contact bounce time) (Initial)|
||Release time (at nominal voltage)|Max. 15ms (excluding contact bounce time, without diode) (Initial)|
|Mechanical|Shock resistance<br>Functional<br>Destructive|Min. 100 m/s2{10G} (Half-wave pulse of sine wave: 11ms; detection: 10µs)<br>Min. 1,000 m/s2{100G} (Half-wave pulse of sine wave: 6ms)|
|characteristics|Vibration<br>Functional|10 Hz to 100 Hz, Min. 44.1m/s2{4.5G} (Detection time: 10µs)|
||resistance<br>Destructive|10 Hz to 2,000 Hz, Min. 44.1m/s2{4.5G}   Time of vibration for each direction; X. Y. Z direction: 4 hours|
|Expected life|Electrical (at nominal switching capacity)|Flux-resistant type: Min. 105, Sealed type: Min. 5×104(Operating frequency: 2s ON, 2s OFF)<br>With diode inside: Min. 5×104(Operating frequency: 2s ON, 2s OFF)|
||Mechanical|Min. 106(at 120 cpm)|
|Conditions|Conditions for operation, transport and storage|Ambient temp: –40°C to +85°C–40°F to +185°F<br>Humidity: 5% R.H. to 85% R.H. (Not freezing and condensing at low temperature)|
||Max. operating speed|15 cpm (At nominal switching capacity)|
|Unit weight||Approx. 26 g.92 oz, Approx. 28 g.99 oz(with diode inside)|



Note: * This value can change due to the switching frequency, environmental conditions, and desired reliability level, therefore it is recommended to check this with the actual load. 

## 5) 35 A type (24 V coil voltage) 

|Characteristics|Item||Specifcations|Specifcations|
|---|---|---|---|---|
|Contact|Arrangement|1 Form A||1 Form C|
||Nominal switching capacity (Resistive load)|15A 28V DC||N.O.: 15A 28V DC, N.C.: 8A 28V DC|
|Rating|Max. carrying current<br>(14V DC, at 85°C185°F, continuous)|N.O.: 15A||N.O.: 15A, N.C.: 8A|
||Nominal operating power||1.8W, 2.0W (with resistor inside)||



Note: All other specifications are the same as those of 35 A type (12 V coil voltage). 

All Rights Reserved © C OPYRIGHT Panasonic Electric Works Co., Ltd. 

CB 

## **REFERENCE DATA** 

## **CB RELAYS (Standard type)** 

2. Max. switching capability (Resistive load) (Standard type) 

## 1. Allowable ambient temperature 

3. Ambient temperature and operating voltage range 

(Standard type) 

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(N.O. side  Room temperature)<br>150 60 40<br>140<br>35<br>50<br>120 20A 30<br>40<br>100 25<br>30A<br>30 20<br>80 40A<br>15<br>20<br>60 10 [5]  cycle line 10<br>40 10 Actual value 5 Pick-up voltage<br>2090 100 110 120 130 140 150 0 0 10 20 30(Max. 1040 [5]  cycle)50 0−40 −20 0 20(Cold start)40 60 8085 100 120<br>Applied Coil Voltage, %V Switching current, A Ambient temperature, °C<br>Asssumption:<br>• Maximum mean coil temperature: 180°C<br>• Curves are based on 1.4W (Nominal power consumption of the unsupprressed coil at nominal voltage)<br>4. Distribution of pick-up and drop-out voltage 5. Distribution of operate and release time<br>Sample: CB1-P-12V, 42pcs. Sample: CB1-P-24V, 42pcs.<br>* Without diode<br>60 60<br>Pick-up voltage Operate time<br>50 Drop-out voltage 50 Release time<br>40 40<br>30 30<br>20 20<br>10 10<br>0 0<br>1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 1.01.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0<br>Voltage, V Operate and release time, ms<br>6-(1). Electrical life test (Motor free) Change of pick-up and drop-out voltage Change of contact resistance<br>Sample: CB1F-12V, 5pcs.<br>Load: 25A 14V DC, motor free actual load<br>Switching frequency: (ON:OFF = 1s:9s) 6 50<br>Ambient temperature: Room temperature<br>Circuit 5<br>40<br>Tested sample Pick-up voltage<br>4 MX ax.<br>Min. 3<br>Relay harness<br>3 Max.<br>X 20<br>2 Drop-out voltage Min.<br>14V DC M Motor<br>10<br>1<br>Max.<br>X<br>0 0 Min.<br>Observation of load waveform 0 5 10 0 5 10<br>with current probe and digital No. of operations, × 10 [4] No. of operations, × 10 [4]<br>oscilloscope<br>C°<br>Switching voltage, VDC Coil applied voltage, VDC<br>Maximum Allowable Ambient Temperature,<br>Frequency Quantity, n<br>Ω<br>Contact resistance, m<br>Pick-up and drop-out voltage, V<br>**----- End of picture text -----**<br>


Load current waveform Inrush current: 80A, Steady current: 25A 

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20A<br>200ms<br>**----- End of picture text -----**<br>


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All Rights Reserved © C OPYRIGHT Panasonic Electric Works Co., Ltd. 

CB 

Change of contact resistance 

6-(2). Electrical life test (Lamp load) Sample: CB1F-12V, 5pcs. Load: 45/65Wx5 parallel, 14V DC, halogen lamp actual load Switching frequency: (ON:OFF = 1s:8s) Ambient temperature: Room temperature Circuit 

**==> picture [155 x 96] intentionally omitted <==**

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Relay<br>Halogen lamp 12V 45/65W<br>14V DC<br>Observation of load waveform with<br>current probe and digital oscilloscope<br>**----- End of picture text -----**<br>


Change of pick-up and drop-out voltage 

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**----- Start of picture text -----**<br>
6 50<br>5<br>Pick-up voltage 40<br>Max.<br>4 X<br>Min. 30<br>3<br>20<br>2 Drop-out voltage<br>Max.<br>X<br>Min. 10<br>1<br>Max.<br>X<br>0 0 Min.<br>0 10 20 0 10 20<br>No. of operations, × 10 [4] No. of operations, × 10 [4]<br>Ω<br>Contact resistance, m<br>Pick-up and drop-out voltage, V<br>**----- End of picture text -----**<br>


Load current waveform Inrush current: 100A, Steady current: 20A 

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20.5A<br>200ms<br>**----- End of picture text -----**<br>


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## **CB RELAYS (High contact capacity type)** 

## 1. Allowable ambient temperature 

## 2. Max. switching capability 

(High contact capacity type) 

## 3. Ambient temperature and operating voltage range 

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(High contact capacity type)<br>150 60 40<br>140<br>35<br>50<br>120 30<br>30A 40<br>100 25<br>40A 30 20 Operation range<br>80<br>50A<br>15<br>20<br>60<br>10<br>60A 10 10 [5]  cycle line<br>40 Actual value 5<br>70A (Max. 1 cycle) Pick-up voltage<br>2090 100 110 120 130 140 150 0 0 20 40 60 80 100 0−40 −20 0 20(Cold start)40 60 8085 100 120<br>Applied Coil Voltage, %V Switching current, A Ambient temperature, °C<br>Asssumption:<br>• Maximum mean coil temperature: 180°C<br>• Curves are based on 1.4W (Nominal power consumption of the unsupprressed coil at nominal voltage)<br>4. Distribution of pick-up and drop-out voltage 5. Distribution of operate and release time 6. Contact resistance<br>Sample: CB1aHF-12V, 53pcs. Sample: CB1aHF-12V, 53pcs. Sample: CB1aHF-12V, 53pcs.<br>(By voltage drop 6V DC 1A)<br>70 12 70<br>Pick-up voltage<br>60 Drop-out voltage 10 Operate time 60<br>50 50<br>8<br>40 40<br>6<br>30 30<br>4<br>20 20<br>Release time<br>2<br>10 10<br>0 0 0<br>0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 8 10 12 14 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8<br>Voltage, V Coil voltage, V Resistance, mΩ<br>C°<br>Switching voltage, VDC Coil applied voltage, VDC<br>Maximum Allowable Ambient Temperature,<br>Frequency Frequency<br>Operate and release time, ms<br>**----- End of picture text -----**<br>


All Rights Reserved © C OPYRIGHT Panasonic Electric Works Co., Ltd. 

Change of pick-up and drop-out voltage 

Change of contact resistance 

## CB 

## 7-(1). Electrical life test (Motor free) 

Sample: CB1aH-12V, 3pcs. Load: Inrush current: 64A/Steady current: 35A Fan motor actual load (motor free) 12V DC Switching frequency: (ON:OFF = 3s:7s) Ambient temperature: Room temperature Circuit 

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**----- Start of picture text -----**<br>
Fan motor actual load (motor free) 12V DC 10 50<br>Switching frequency: (ON:OFF = 3s:7s) 9<br>Ambient temperature: Room temperature<br>8 40<br>7<br>6 30<br>Pick-up voltage<br>5<br>3s 7s Max.<br>4 X 20<br>Drop-out voltage Min.<br>10s 3<br>Max.<br>2 X 10 Max.<br>Min. X<br>1<br>Min.<br>0 0<br>0 5 10 0 5 10<br>M<br>No. of operations, × 10 [4] No. of operations, × 10 [4]<br>Ω<br>Contact resistance, m<br>Pick-up and drop-out voltage, V<br>**----- End of picture text -----**<br>


## Load current waveform 

Inrush current: 64A, Steady current: 35A 

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**----- Start of picture text -----**<br>
10A<br>500ms<br>**----- End of picture text -----**<br>


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7-(2). Electrical life test (Motor lock) Sample: CB1aH-12V, 5pcs. Load: 100A 14V DC 

Magnet clutch actual load (lock condition) Switching frequency: (ON:OFF = 1s:9s) Ambient temperature: Room temperature Circuit 

**==> picture [161 x 86] intentionally omitted <==**

**----- Start of picture text -----**<br>
Clutch<br>14V DC M (5V DC<br>applied)<br>Lock condition<br>**----- End of picture text -----**<br>


Change of pick-up and drop-out voltage 

Change of contact resistance 

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**----- Start of picture text -----**<br>
6 50<br>Pick-up voltage<br>5 Max. 40<br>X<br>4 Min.<br>30<br>3 Max.<br>X 20<br>Min.<br>2<br>Drop-out voltage<br>10 Max.<br>1<br>X<br>Min.<br>0 0<br>0 10 20 40 60 80 100 0 10 20 40 60 80 100<br>No. of operations No. of operations<br>Ω<br>Contact resistance, m<br>Pick-up and drop-out voltage, V<br>**----- End of picture text -----**<br>


Load current waveform 100A 14V DC 

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**----- Start of picture text -----**<br>
20A<br>200ms<br>**----- End of picture text -----**<br>


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All Rights Reserved © C OPYRIGHT Panasonic Electric Works Co., Ltd. 

CB 

## **CB RELAY (35 A type)** 

## 1-(1). Distribution of pick-up and drop-out voltage 

Sample: CB1aV-12V, 30pcs. 

1-(2). Distribution of pick-up and drop-out voltage Sample: CB1aV-24V, 30pcs. 

1-(3). Distribution of pick-up and drop-out voltage 

Sample: CB1V-24V, 30pcs. 

**==> picture [528 x 310] intentionally omitted <==**

**----- Start of picture text -----**<br>
20 20 30<br>Pick-up voltage Pick-up voltage Pick-up voltage<br>18<br>Drop-out voltage Drop-out voltage Drop-out voltage<br>25<br>16<br>15<br>14<br>20<br>12<br>10 10 15<br>8<br>10<br>6<br>5<br>4<br>5<br>2<br>0 0 0<br>0 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 0 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0 10.5 11.0 11.5 0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0<br>3.5 4.5 11.5 12.5<br>Voltage, V Voltage, V Voltage, V<br>2.-(1) Contact resistance 2.-(2) Contact resistance 2.-(3) Contact resistance<br>Sample: CB1aV-12V, 30pcs.  Sample: CB1aV-24V, 30pcs.  Sample: CB1V-24V, 30pcs.<br>(By voltage drop 12 V DC 1A) (By voltage drop 24 V DC 1A) (By voltage drop 24 V DC 1A)<br>25 25 20<br>N.C. side<br>N.O. side<br>20 20<br>15<br>15 15<br>10<br>10 10<br>5<br>5 5<br>0 0 0<br>0 1.4 1.6 1.8 2.0 0 1.4 1.6 1.8 2.0 0 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0<br>Contact resistance, mΩ Contact resistance, mΩ Contact resistance, mΩ<br>Frequency Frequency Frequency<br>Frequency Frequency Frequency<br>**----- End of picture text -----**<br>


## 3. Electrical life test (Blower fan) 

Sample: CB1aV-D-24V, 3pcs. Load: Blower fan load 28 V DC Inrush current: 30 A/Steady current: 10 A Switching frequency: (ON:OFF = 3s:3s) Switching cycle: 10[5] Ambient temperature: 85°C Coil protective element: Diode Circuit 3s 3s 6s M 

## Change of pick-up and drop-out voltage 

Change of contact resistance 

**==> picture [329 x 133] intentionally omitted <==**

**----- Start of picture text -----**<br>
11 50<br>10<br>Max.<br>9 X 40<br>Pick-up voltage Min.<br>8<br>7 30<br>6<br>5<br>20<br>4<br>Max.<br>3 X<br>2 Drop-out voltage Min. 10 Max.<br>X<br>1<br>Min.<br>0 0<br>0 5 10 0 5 10<br>No. of operations, × 10 [4] No. of operations, × 10 [4]<br>Ω<br>Contact resistance, m<br>Pick-up and drop-out voltage, V<br>**----- End of picture text -----**<br>


Load current waveform 

Inrush current: 30 A, Steady current: 10 A 

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**----- Start of picture text -----**<br>
10A<br>500ms<br>**----- End of picture text -----**<br>


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All Rights Reserved © C OPYRIGHT Panasonic Electric Works Co., Ltd. 

CB 

## **DIMENSIONS** (Unit: mm inch) 

**1. PC board type** 

Schematic (Bottom view) 

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**----- Start of picture text -----**<br>
External dimensions Schematic (Bottom view)<br>1 Form A<br>25.0 86<br>.984 30<br>87<br>85<br>4.5 Including diode type,<br>.177 1.0 2.15 22.0 c including resistor type also available e<br>.039 6.3 .085 .866<br>.248 1 Form C<br>26.0<br>1.024 86<br>87a<br>30<br>87<br>85<br>86 87a 8.4 Including diode type,<br>.331 including resistor type also available<br>16.8<br>0.8 30 .661<br>.031 a 85 i 87 a<br>8 2.6 PC board pattern (Bottom view)<br>.315 .102<br>8.4<br>17.9 .331 4(or5)-2.6<br>.705 4(or5)-.102 1 Form C type only<br>86 87a .3318.4<br>16.8<br>Dimension: General tolerance 30 87 .661<br>4(or5)-1.4 85<br>Max. 1mm .039 inch: ±0.1  _ ±.004 4(or5)-.055 Ff<br>8.0 1 Form C type only<br>1 to 3mm .039 to .118 inch: ±0.2 ±.008 .315<br>8.4<br>Min. 3mm .118 inch: ±0.3 ±.012 .331<br>- +E 17.9<br>.705<br>External dimensions Schematic (Bottom view)<br>1 Form A<br>86<br>25.0<br>.984 30<br>87<br>85<br>4.0 Including diode type,<br>11.0.157 including resistor type also available<br>.433<br>1.7 dia. 5-6.3 22.0 1 Form C<br>.067 dia. 1.0245-.24826.0 .866 30 86 87a<br>8.4 87<br>.331 85<br>86 87a Including diode type,<br>including resistor type also available<br>16.8<br>.0310.8 30 85 87 .661<br>8 2.6<br>.315 .102<br>8.4<br>.331<br>17.9<br>.705<br>**----- End of picture text -----**<br>


## **2. Plug-in type** * The dimensions are the same as those of 35A type. 

Dimension: General tolerance Max. 1mm .039 inch: ±0.1 ±.004 1 to 3mm .039 to .118 inch: ±0.2 ±.008 Min. 3mm .118 inch: ±0.3 ±.012 

All Rights Reserved © C OPYRIGHT Panasonic Electric Works Co., Ltd. 

CB 

**3. Bracket type** 

## External dimensions 

Schematic (Bottom view) 

**==> picture [351 x 243] intentionally omitted <==**

**----- Start of picture text -----**<br>
4.0±0.1 1 Form A<br>16.0 .157±.004<br>.630 1.7 86<br>5.4±0.1 dia. .067 30<br>.213±.004<br>.2366.0 16.0.630 85 87<br>Including diode type,<br>including resistor type also available<br>25.0 1 Form C<br>.984<br>86<br>87a<br>air (f 30 o<br>4.0<br>.43311.0.157 85 87<br>ry Q = Including diode type,<br>.86622.0 .067 dia.1.7 dia. 5-.2485-6.3 including resistor type also available<br>26.0<br>T un  gu t) 1.024 ee<br>0.8<br>.031<br>17.9<br>.705<br>8 8.4<br>.315 .331<br>8.4<br>.1022.6 .66116.8 .331<br>30<br>85 86<br>87a*<br>87<br>**----- End of picture text -----**<br>


Dimension: General tolerance Max. 1mm .039 inch: ±0.1 ±.004 1 to 3mm .039 to .118 inch: ±0.2 ±.008 Min. 3mm .118 inch: ±0.3 ±.012 

## **4. High contact capacity (1 Form A) (Plug-in type)** 

External dimensions 

## Schematic (Bottom view) 

**==> picture [354 x 177] intentionally omitted <==**

**----- Start of picture text -----**<br>
86<br>30<br>1.00425.5 85 87<br>Including diode type,<br>including resistor type also available<br>.59115.0 .1574.0 .43311.0 cy]<br>5.8<br>.228<br>2-6.3 [±][0.08] 2-9.5 [±][0.08]<br>26.5 2-.248 [±][.003] 22.0 2-.374 [±][.003]<br>1.043 .866<br>4-1.7 dia. hole<br>4-.067 dia. hole<br>8.4<br>0.8 .331<br>.031 86<br>1.2 16.8<br>.047 30 .661<br>85 87<br>8.4 2.6<br>.331 .102<br>17.9<br>.705<br>**----- End of picture text -----**<br>


Dimension: 

General tolerance 

Max. 1mm .039 inch: ±0.1 ±.004 1 to 3mm .039 to .118 inch: ±0.2 ±.008 Min. 3mm .118 inch: ±0.3 ±.012 

All Rights Reserved © C OPYRIGHT Panasonic Electric Works Co., Ltd. 

CB 

## **5. High contact capacity (1 Form A) (PC board type)** 

**==> picture [358 x 191] intentionally omitted <==**

**----- Start of picture text -----**<br>
External dimensions Schematic (Bottom view)<br>86<br>30<br>1.00425.51.0 .0391.04.5 .0391.0 85 87<br>.039 .177 Including diode type,<br>5.3 5.3 4.5 including resistor type also available<br>.209 .209 .177<br>3-1.73-.067 9.5 6.3 2-2.152-.085 A* 9.5 3-1.73-.067<br>.374 .248 .374<br>1.04326.5 22.0.866 PC board pattern (Bottom view)<br>2-0.8 Sealed by epoxy resin 8.4.331 .0551.4 .1022.6 3-2.153-.085<br>2-.031 8 6<br>2-1.22-.047 3.93.9.154 16.8.661 3-1.8 86 7.8 .3318.4 16.8<br>3 0 8 5 8 7 .154 3-.071 30 87 .307 .661<br>85<br>8.4 3-2.15 3-1.8<br>3.9.154 3.9.154 17.9.705.331 2.6.102 3-.085 Ta .3077.8 .70517.9.3318.4 3-.071<br>**----- End of picture text -----**<br>


- Intervals between terminals is measured at A surface level. 

Dimension: General tolerance Max. 1mm .039 inch: ±0.1 ±.004 1 to 3mm .039 to .118 inch: ±0.2 ±.008 Min. 3mm .118 inch: ±0.3 ±.012 

## **Cautions regarding the protection element** 

## **1. Part numbers without protection elements** 

1) 12 V models 

When connecting a coil surge protection circuit to these relays, we recommend a zener diode with a zener voltage of 24 V or higher, or a resistor (680Ω to 1,000Ω). When a diode is connected to the coil in parallel, the release time will slow down and working life may shorten. Before use, please check the circuit and verify that the diode is not connected in parallel to the coil drive circuit. 2) 24 V models 

When connecting a coil surge protection circuit to these relays, we recommend a zener diode with a zener voltage of 48 V or higher, or a resistor (2,800Ω to 4,700Ω). 

When a diode is connected to the coil in parallel, the release time will slow down and working life may shorten. Before use, please check the circuit and verify that the diode is not connected in parallel to the coil drive circuit. 

## **2. Part numbers with diodes** 

These relays use a diode in the coil surge protection element. Therefore, the release time is slower and the working life might be shorter compared to part numbers without protection elements and part numbers with resistors. 

Be sure to use only after evaluating under actual load conditions. 

## **3. Part numbers with resistors** 

This part number employs a resistor in the coil surge protection circuit; therefore, an external surge protection element is not required. In particular, when a diode is connected in parallel with a coil, the release time becomes slower which could adversely affect working life. Please check the circuit and make sure that a diode is not connected in parallel with the coil drive circuit. 

## **For Cautions for Use, see Relay Technical Information.** 

All Rights Reserved © C OPYRIGHT Panasonic Electric Works Co., Ltd. 



## Links

- [View this product on Novapart](https://novapart.co/products/CB1A-D-12V/relay-automotive-spst-no-14vdc-40a)
- [Request a quote for this part](https://novapart.co/quote/)
- [Supplier page](https://es.farnell.com/panasonic/cb1a-d-12v/relay-automotive-spst-no-14vdc/dp/1867303)
---

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