6-1608054-6 .

## **GENERAL PURPOSE RELAY** 

## **TYPE 157** 

## **FEATURES:** 

## TYPE 157 

- The Type 157 relay is a rugged power driver offering superior 3/16”through air and 3/8”over-surface spacing. 

- An interlocked frame and contact block prevent contact misalignment during plug-in. 

- Open or dust covered available with indicator lamps and push-to-operate buttons. 

- A magnetic latching version provides a unique switchable core which cannot be falsely latched. 

- All Midtex catalog Type 157 relays have UL & CSA Recognition as motor controllers through 600 VAC 

- They provide through air spacing of 3/16”minimum and over-surface spacing of 3/8”minimum and are recognized for 1/2 hp motor controller applications at 240/480/600 VAC (1/3 hp at 120 VAC). 

- Chassis mounted open relays must employ 1/32”additional insulation between mounting surface and relay to insure 1/2”over-surface and through air to the mounting surface. 

- Sockets for the 157 relays are constructed to meet UL requirements for these ratings. 

- UL File E38802 CSA LR54109 

|CONTACTS||COILS|
|---|---|---|
|**Material**<br>**UL & CSA Recognition Rating**||**Voltage Ratings**<br>6 to 240 VAC 50/60 Hz 5 to 110 VDC|
|1/8”Fine Sliver<br>(gold flash)<br>5 amp<br>-100<br>5 amp, 28 VDC/<br>120/240 VAC, 80% pf<br>2 amp<br>480/600 VAC, 80% pf<br>1/8 hp<br>120 VAC<br>1/4 hp<br>240 VAC<br>2 amp 7.2 amp in rush, 24 VAC (SP devices)||**Pick-up Voltage**<br>**Duty Cycle**<br>**Shock**<br>AC–85% of nominal<br>DC–75% of nominal<br>Rated for continuous duty<br>operation at 25% overvoltage<br>15 g’s, 11±1mS (non-operating test,<br>no mechanical damage)|
|3/16”Silver<br>Cadmium Oxide<br>10 amp<br>3/16”Silver<br>Cadmium Oxide<br>-200<br>-300<br>10 amp, 28 VDC/<br>120/240 VAC, 80% pf<br>1/3 hp<br>120 VAC<br>1/2 hp<br>277/240/480/600 VAC<br>36 LRA, 8.5 FLA, 18VDC<br>3 amp<br>480/600 VAC, 80% pf<br>10 amp<br>277VAC resistive<br>15 amp<br>277/240/120 VAC<br>10 amp<br>28 VDC||**Power Ratings***<br>**Temperature Rise***<br>Nominal<br>Max. Continuous<br>1.7 VA<br>2.7 VA<br>2.0 VA<br>3.1 VA<br>1.2 W<br>1.9 W<br>**1 & 2 Pole AC**<br>**3 Pole AC**<br>**DC**<br>**Vibration**<br>0.1”DA or 10g’s, 10 to 55 Hz<br>(operating test, no contact chatter)<br>a<br>ee ee<br>ee<br>es<br>ee|
|15 amp<br>(UL on 1 & 2PDT<br>only)<br>1/8”Fine<br>Sliver Gold<br>Diffused<br>-700<br>3 amp<br>480/600 VAC<br>1/3 hp<br>120 VAC<br>1/2 hp<br>240/480/600 VAC<br>600w Tungsten<br>120/240 VAC<br>5 amp, 28 VDC/<br>120/240 VAC, 80% pf<br>2 amp<br>480/600 VAC, 80% pf<br>1/8 hp<br>120 VAC<br>1/4 hp<br>240 VAC||Nominal Voltage<br>25% overvoltage<br>**1 & 2 Pole AC**<br>**3 Pole AC**<br>**DC**<br>**Open**<br>35°C<br>55°C<br>**Enc.**<br>45°C<br>65°C<br>**Open**<br>45°C<br>75°C<br>**Enc.**<br>60°C<br>85°C<br>**Open**<br>35°C<br>50°C<br>**Enc.**<br>40°C<br>55°C<br>*60 Hz operation<br>Increase values 20% for 50 Hz operation.<br>a<br>a<br>aee<br>Po|
|Mag Blowout<br>(See Note)<br>-3MO<br><br>2 amp 7.2 amp in rush, 24 VAC (SP devices)<br>1 Form X<br>12A @  150 VDC<br>2 Form A<br>7A @  150 VDC<br>2 Form C<br>5A @  150 VDC<br>All ratings at 25°C ambient<br>**Design and Construction**<br>Recognized by UL for motor controllers up to 600 VAC in accordance with UL Standard<br>508, Industrial Control Equipment. Optional features include manual push-to-test button<br>and indicator lamp.<br>**Insulation Material**-High quality phenolic<br>**Note:** For Mag Blowout positive contacts are 7 and 9. Negative contacts are 1, 3, 4 and 6.<br>ELECTRICAL/ CHANICAL CHARACTERISTICS||**Nominal Voltage**<br>**Resistance**<br>**(Ohms±10%)**<br>5<br>6<br>12<br>24<br>48<br>110<br>V<br>D<br>C<br>V<br>A<br>C<br>6<br>12<br>24<br>120<br>240<br>**1 & 2PDT**<br>6.0<br>21<br>75<br>2250<br>9100<br>**3PDT**<br>4.2<br>18<br>72<br>1700<br>7200<br>20<br>32<br>120<br>470<br>1800<br>10000<br> pf|



**Note:** For Mag Blowout positive contacts are 7 and 9. Negative contacts are 1, 3, 4 and 6. 

## **Design and Construction** 

Recognized by UL for motor controllers up to 600 VAC in accordance with UL Standard 508, Industrial Control Equipment. Optional features include manual push-to-test button and indicator lamp. 

**Insulation Material** -High quality phenolic 

**Weight** (approximate)-2.3 ounces (64 grams)— open relay 3.0 ounces (84 grams)— enclosed relay 

## **Marking** 

Midtex name, part number, nominal voltage, and terminal identification are standard. Customer marking optional. 

**Initial Contact Resistance** –50 milliohms max. 

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## **TYPE 157** 

|**Relay Type**|**Enclosure and Terminals**|**Contact Arr.**|**Coil**|**Contacts**|**Standard or Special**|
|---|---|---|---|---|---|
|157|1–Open, Solder/Plug-in/ .187 Quick<br>Connect<br>2–Plain Cover, Solder/Plug-in/ .187<br>Quick Connect<br>3–Flanged Cover, Solder/ .187 Quick<br>Connect<br>4–Plain Cover with End Mounting<br>Bracket, Solder/Plug-in/.187 Quick<br>Connect<br>9–Plain Cover, P.C. Terminal<br>0–Special (Including top flange)|1–SPDT<br>2–2PDT<br>3–3PDT<br>4–1 Form A<br>5–1 Form B<br>6–2 Form A<br>7–2 Form B<br>8–1 Form X<br>9–1 Form Y<br>0–Special|E–5 VDC<br>A–6 VDC<br>B–12 VDC<br>C–24 VDC<br>D–48 VDC<br>F–110 VDC<br>N–6 VAC<br>P–12 VAC<br>Q–24 VAC<br>T–120 VAC<br>U–240 VAC<br>S–Special|1–1/8”Fine Silver<br>Gold Flash<br>2–3/16”Silver<br>Cadmium Oxide<br>(10 Amp)<br>3–3/16”Silver<br>Cadmium Oxide<br>(15 Amp)<br>7–1/8”Fine Silver<br>Gold Diffused<br>0–Special|00–Standard<br>C0–Push Button Actuator<br>D0–Diode across Coil<br>F0–Class “F”Coil<br>L0–Lamp Across Coil<br>LC–Lamp & Push Button<br>M0–Mag Blowout<br>09–PC Terminal without<br>Cover. Use 9 in first digit.<br>A1-Z9–Special<br>*Top Flange avail.–Consult<br>Factory|



Example:157-23C200 is a Type 157 relay, plain cover, solder/plug-in/.187 quick connect terminals 3 pole double throw contacts, 24VDC coil, 3/16”diameter Silver Cadmium Oxide contacts, of completely standard construction. 

**Stock items** :157-22B200, 157-22C200, 157-22C2L0, 157-22F200, 157-22Q200, 157-22Q2LC, 157-22T200, 157-22T2L0, 157-22U200, 157-23B200, 157-23C200, 157-23C2L0, 157-23Q200, 157-23Q2L0, 157-23T200, 157-23T2L0, 157-23T2LC, 157-32B200, 157-32C200, 157-32Q200, 157-32T200, 157-33B200, 157-33C200, 157-33Q200, 157-33T200. 

|**Operating****<br>ee|**Minimum**<br>rs|**Maximum**<br>rseee|**Maximum**<br>rseee|**Storage**|
|---|---|---|---|---|
|||**Open**<br>rs|**Enclosed**<br>eee||
|1 & 2 pole<br>3 pole<br>1, 2, 3, pole<br>AC<br>AC<br>DC<br>ee|–45°C<br>–45°C<br>–45°C<br>rs|+70°C<br>+60°C<br>+80°C<br>rs|+60°C<br>+45°C<br>+70°C<br> eee|–65°C to +100°C|



**50/60 Hz operation, based on 105°C limit. 

## ELECTRICAL CHARACTERISTICS 

## **Dielectric Breakdown** 

Greater than 1200 VAC, RMS 60 Hz across open contacts Greater than 2500 VAC, RMS 60 Hz all other mutually insulated elements 

## **Insulation Resistance** 

1000 megohms minimum at 500 VDC 

## **Timing** 

Operate time— 15 mS nominal, 20 mS maximum Release time— 6 mS nominal, 10 mS maximum (Nominal voltage, no coils suppression, DC relays only) 

## **Life Expectancy** 

Mechancial— 10 million operations Electrical— 100,000 operations at rated load 

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Libertyville IL (847) 680-7400 FAX (847) 680-8169    www.ciitech.com 

## **TYPE 157** 

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TERMINALS<br>**----- End of picture text -----**<br>


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Solder/Plug In .187 Quick Connect Printed Ciruit Terminal<br>187.002<br>4.75.05) 020,002<br>(4.7505) 076.008 on 51,05<br>(1.98.13) " (1.19)<br>ott 020 156<br>(6.35.13)250,005 (051) | eeove (3.96)A<br>i [ 125.005 lO | 1.98)re-<br>280 Ref. (3.18.13) dt<br>(7.11)<br>Inches Mates with .187”UL standard quick connect Printed Circuit Terminal For direct relay<br>(Millimeters) ternimal also suitable for solder connection. to PCB mounting. Model 157-9<br>Model 157-1,-2,-3,-4<br>**----- End of picture text -----**<br>


1 Form C (SPDT) 2 Form C (DPDT) 3 Form C (3PDT) Reference Only 

## PCB LAYOUT 

Bottom View Reference Only 

**See RELAY SOCKETS on page 51. See HOLD DOW N SPRINGS on page 53.** 

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