GENERAL PURPOSE RELAY TYPE 157 TYPE 157 FEATURES: 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 Voltage Ratings 6 to 240 VAC 50/60 Hz 5 to 110 VDC UL & CSA Recognition Rating Material AC85% of nominal 5 amp, 28 VDC/ 120/240 VAC, 80% pf 1/8 Fine Sliver Pick-up Voltage -100 DC75% of nominal 2 amp 480/600 VAC, 80% pf (gold flash) Rated for continuous duty 1/8 hp 120 VAC 5 amp Duty Cycle operation at 25% overvoltage 1/4 hp 240 VAC 15 gs, 111mS (non-operating test, 2 amp 7.2 amp in rush, 24 VAC (SP devices) Shock no mechanical damage) 10 amp, 28 VDC/ 120/240 VAC, 80% pf 0.1 DA or 10gs, 10 to 55 Hz 3/16 Silver -200 Vibration (operating test, no contact chatter) 1/3 hp 120 VAC Cadmium Oxide 1/2 hp 277/240/480/600 VAC 10 amp Power Ratings* 36 LRA, 8.5 FLA, 18VDC 3 amp 480/600 VAC, 80% pf 1 & 2 Pole AC 3 Pole AC DC 10 amp 277VAC resistive Nominal 2.0 VA 1.2 W 1.7 VA 3.1 VA 1.9 W Max. Continuous 2.7 VA 15 amp 277/240/120 VAC 3/16 Silver -300 Temperature Rise* 10 amp 28 VDC Cadmium Oxide 3 amp 480/600 VAC 15 amp 3 Pole AC DC 1 & 2 Pole AC 1/3 hp 120 VAC (UL on 1 & 2PDT Open Enc. Open Enc. Open Enc. 1/2 hp 240/480/600 VAC only) Nominal Voltage 35C 45C 60C 40C 45C 35C 600w Tungsten 120/240 VAC 25% overvoltage 55C 65C 85C 55C 75C 50C *60 Hz operation 5 amp, 28 VDC/ 120/240 VAC, 80% pf 1/8 Fine -700 Increase values 20% for 50 Hz operation. 2 amp 480/600 VAC, 80% pf Sliver Gold 1/8 hp 120 VAC Diffused 1/4 hp 240 VAC COIL CHARACTERISTICS 2 amp 7.2 amp in rush, 24 VAC (SP devices) Resistance Nominal Voltage (Ohms10%) 1 Form X 12A 150 VDC Mag Blowout -3MO 2 Form A 7A 150 VDC 20 (See Note) 5 2 Form C 5A 150 VDC 32 6 V 12 120 Note: For Mag Blowout positive contacts are 7 and 9. Negative contacts are 1, 3, 4 and 6. D 24 470 C 48 1800 ELECTRICAL/MECHANICAL CHARACTERISTICS 110 10000 All ratings at 25C ambient 1 & 2PDT 3PDT Design and Construction 6 6.0 4.2 V Recognized by UL for motor controllers up to 600 VAC in accordance with UL Standard 12 21 18 A 508, Industrial Control Equipment. Optional features include manual push-to-test button 24 75 72 and indicator lamp. C 120 2250 1700 240 9100 7200 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 Resistance50 milliohms max. 15 Libertyville IL (847) 680-7400 FAX (847) 680-8169 www.ciitech.comTYPE 157 PART NUMBERING SYSTEM Relay Type Enclosure and Terminals Contact Arr. Coil Contacts Standard or Special 157 1SPDT E5 VDC 11/8 Fine Silver 00Standard 1Open, Solder/Plug-in/ .187 Quick 22PDT A6 VDC Gold Flash C0Push Button Actuator Connect 33PDT B12 VDC 23/16 Silver D0Diode across Coil 2Plain Cover, Solder/Plug-in/ .187 41 Form A C24 VDC Cadmium Oxide F0Class F Coil Quick Connect 51 Form B D48 VDC (10 Amp) L0Lamp Across Coil 3Flanged Cover, Solder/ .187 Quick 62 Form A F110 VDC 33/16 Silver LCLamp & Push Button Connect 72 Form B N6 VAC Cadmium Oxide M0Mag Blowout 4Plain Cover with End Mounting 81 Form X P12 VAC (15 Amp) 09PC Terminal without Bracket, Solder/Plug-in/.187 Quick 91 Form Y Q24 VAC 71/8 Fine Silver Cover. Use 9 in first digit. Connect T120 VAC Gold Diffused A1-Z9Special 9Plain Cover, P.C. Terminal *Top Flange avail.Consult U240 VAC 0Special (Including top flange) Factory 0Special SSpecial 0Special 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, TEMPERATURE RANGE 157-22Q200, 157-22Q2LC, 157-22T200, 157-22T2L0, 157-22U200, Maximum Storage Operating** Minimum 157-23B200, 157-23C200, 157-23C2L0, 157-23Q200, 157-23Q2L0, Open Enclosed 157-23T200, 157-23T2L0, 157-23T2LC, 157-32B200, 157-32C200, AC 1 & 2 pole 45C +70C +60C 157-32Q200, 157-32T200, 157-33B200, 157-33C200, 157-33Q200, AC 45C 3 pole +60C 65C to +100C +45C 157-33T200. DC 45C 1, 2, 3, pole +80C +70C **50/60 Hz operation, based on 105C limit. ELECTRICAL CHARACTERISTICS Timing Dielectric Breakdown Operate time15 mS nominal, 20 mS maximum Greater than 1200 VAC, RMS 60 Hz across open contacts Release time6 mS nominal, 10 mS maximum Greater than 2500 VAC, RMS 60 Hz all other mutually insulated elements (Nominal voltage, no coils suppression, DC relays only) Insulation Resistance Life Expectancy 1000 megohms minimum at 500 VDC Mechancial10 million operations Electrical100,000 operations at rated load DIMENSIONS Open Model 157-3 Model 157-1 Model 157-4 Dust Cover Model 157-2 Inches (Millimeters) 16 Libertyville IL (847) 680-7400 FAX (847) 680-8169 www.ciitech.com