Libertyville IL (847) 680-7400 FAX (847) 680-8169 www.ciitech.com 15
GENERAL PURPOSE RELAY
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
Voltage Ratings
Pick-up Voltage
Duty Cycle
Power Ratings*
Tem perature Rise*
Nominal
Max. Continuous
Nominal Voltage
25% overvoltage
1.7 VA
2.7 VA
1 & 2 Pole AC
2.0 VA
3.1 VA
3 Pole AC
1.2 W
1.9 W
DC
1 & 2 Pole AC 3 Pole AC DC
Shock
Vibration
6 to 240 VAC 50/60 Hz 5 to 110 VDC
AC–85% of nominal
DC–75% of nominal
Rated for continuous duty
operation at 25% overvoltage
15 g’s, 11±1mS (non-operating test,
no mechanical damage)
0.1”DA or 10g’s, 10 to 55 Hz
(operating test, no contact chatter)
Material UL & CSA Recognition Rating
1/8”Fine Sliver
(gold flash)
5 amp
3/16”Silver
Cadmium Oxide
10 amp
3/16”Silver
Cadmium Oxide
15 amp
(UL on 1 & 2PDT
only)
1/8”Fine
Sliver Gold
Diffused
Mag Blowout
(See Note)
-100
-200
-300
-700
-3MO
Nom inal Voltage Resistance
(Ohm s±10% )
5
6
12
24
48
110
V
D
C
V
A
C
6
12
24
120
240
1 & 2PDT
6.0
21
75
2250
9100
3PDT
4.2
18
72
1700
7200
20
32
120
470
1800
10000
5 amp, 28 VDC/ 120/240 VAC, 80% pf
2 amp 480/600 VAC, 80% pf
1/8 hp 120 VAC
1/4 hp 240 VAC
2 amp 7.2 amp in rush, 24 VAC (SP devices)
10 amp, 28 VDC/ 120/240 VAC, 80% pf
1/3 hp 120 VAC
1/2 hp 277/240/480/600 VAC
36 LRA, 8.5 FLA, 18VDC
3 amp 480/600 VAC, 80% pf
10 amp 277VAC resistive
15 amp 277/240/120 VAC
10 amp 28 VDC
3 amp 480/600 VAC
1/3 hp 120 VAC
1/2 hp 240/480/600 VAC
600w Tungsten 120/240 VAC
5 amp, 28 VDC/ 120/240 VAC, 80% pf
2 amp 480/600 VAC, 80% pf
1/8 hp 120 VAC
1/4 hp 240 VAC
2 amp 7.2 amp in rush, 24 VAC (SP devices)
1 Form X 12A @ 150 VDC
2 Form A 7A @ 150 VDC
2 Form C 5A @ 150 VDC
Open
35°C
55°C
Enc.
45°C
65°C
Open
45°C
75°C
Enc.
60°C
85°C
Open
35°C
50°C
Enc.
40°C
55°C
*60 Hz operation
Increase values 20% for 50 Hz operation.
All ratings at 25°C ambient
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
W eight (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.
Note: For Mag Blowout positive contacts are 7 and 9. Negative contacts are 1, 3, 4 and 6.
Libertyville IL (847) 680-7400 FAX (847) 680-8169 www.ciitech.com
16
Operating** M inim um Storage
M axim um
Open Enclosed
1 & 2 pole
3 pole
1, 2, 3, pole
–45°C
–45°C
–45°C
+70°C
+60°C
+80°C
+60°C
+45°C
+70°C
–65°C to +100°C
Coil
Relay Type
157
Enclosure and Terminals
1–Open, Solder/Plug-in/ .187 Quick
Connect
2–Plain Cover, Solder/Plug-in/ .187
Quick Connect
3–Flanged Cover, Solder/ .187 Quick
Connect
4–Plain Cover with End Mounting
Bracket, Solder/Plug-in/.187 Quick
Connect
9–Plain Cover, P.C. Terminal
0–Special (Including top flange)
Contact Arr.
1–SPDT
2–2PDT
3–3PDT
4–1 Form A
5–1 Form B
6–2 Form A
7–2 Form B
8–1 Form X
9–1 Form Y
0–Special
Contacts
1–1/8”Fine Silver
Gold Flash
2–3/16”Silver
Cadmium Oxide
(10 Amp)
3–3/16”Silver
Cadmium Oxide
(15 Amp)
7–1/8”Fine Silver
Gold Diffused
0–Special
Standard or Special
00–Standard
C0–Push Button Actuator
D0–Diode across Coil
F0–Class “F”Coil
L0–Lamp Across Coil
LC–Lamp & Push Button
M0–Mag Blowout
09–PC Terminal without
Cover. Use 9 in first digit.
A1-Z9–Special
*Top Flange avail.–Consult
Factory
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
Tim ing
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
Open
Model 157-1
Model 157-3
Dust Cover
Model 157-2
Model 157-4
AC
AC
DC
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.
TYPE 157
Stock item s: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.
**50/60 Hz operation, based on 105°C limit.
Inches
(Millimeters)
E–5 VDC
A–6 VDC
B–12 VDC
C–24 VDC
D–48 VDC
F–110 VDC
N–6 VAC
P–12 VAC
Q–24 VAC
T–120 VAC
U–240 VAC
S–Special
Libertyville IL (847) 680-7400 FAX (847) 680-8169 www.ciitech.com 17
Mates with .187”UL standard quick connect
ternimal also suitable for solder connection.
Model 157-1,-2,-3,-4
Printed Ciruit Terminal
Solder/Plug In .187 Quick Connect
Printed Circuit Terminal For direct relay
to PCB mounting. Model 157-9
1 Form C (SPDT) 2 Form C (DPDT) 3 Form C (3PDT)
TYPE 157
Inches
(Millimeters)
Bottom View
Reference Only
Reference Only
See RELAY SOCKETS on page 51.
See HOLD DOW N SPRINGS on page 53.
