74
AUTOMOTIVE POWER RELAY
FEATURES APPLICATION
l High performance l Horn Control
l Starter Motors
l 6.3mm Flat Terminals l Defogger
l Current rating up to 40A l Radiator Fan
l A/C Controls
l Suitable Couplers available
l Security Systems
l Optional Sealing
TECHNICAL DATA FOR CONTACT SIDE :
Model : 74 74-SC
Areas of Application RESISTIVE / INDUCTIVE/HEAD LAMP/CAPACITIVE LOADS
Contact Configuration : 1A/1C 1A/1C
Contact Material : Silver Nickel Silver Nickel / Silver Tin Oxide*
Contact Rating at 230C - 12VDC (Res.) NO : 30 40
NC : 20 30
5
Electrical Life Operations Min. : 2 x 10 2 x 105
6
Mechanical Life Operations Min. : 1 x 10 1 x 106
Contact Voltage Drop at 10 A (Min) : 50mV 50mV
Ma ximum Switching Current
@ 12.8 VDC For 3 Sec. : 120A 150A
*Under introduction
GENERAL DATA FOR COIL SIDE CIRCUIT DIAGRAM
Nominal Coil Power : 1.6W (Approx)
Operating Power : 1.8W (Approx)
Operate Time** : 15 milli Seconds
Release Time** : 15 milli Seconds
** At nominal voltage without coil suppression (excluding bounce) *
OPERATING CONDITIONS 30 85 86 87
0 0 1 Form A
Ambient Temperature : -30 C to +85 C
Ma ximum Temperature : 1550C
Dielectric Strength : 500VRMS
Insulation Resistance : 100 Meg. Ohms Min. At 500 VDC,
250C RH 50
Vibration Resistance (without change : 10-2000Hz 4.4g *
in the switching state>10µS)
30 85 86 87 87a
Shock Resistance (without change : 30g, 8mS 1 Form C
in the switching state>10µS) * parallel resistor or diode optional
HOW TO ORDER COIL DATA
74 1 - 12 - 1C - X XX X - XX
***Pick-up Voltage
Drop-out Voltage
Nominal Voltage
Coil Resistance
Ohms (± 10%)
VDC (Ma x)
VDC (Min)
VDC
Specialities
if any
Product
Series
Nil - unsealed (Standard)
E - Sealed
0-Without Bracket
1-With Bracket
SC - 1 Form C (40 / 30 Amp) Contact 12 8 1.2 85
SA - 1 Form A (40 Amp) Contact
Nominal Voltage
(Refer Coil Data)
Nil - No coil suppression
1 - with resistor across coil
2 - with diode across coil 24 17 2.4 305
Contact Arrangement
1C -1 Form C Use this Section only
1A - 1 Form A for relays with 40/30A
***Lower pick-up Voltages available on request
contact relays
DIMENSIONS
Relay without Bracket Relay with Bracket
27.0
27.0
25.0
27.0
33.0 Ø5.0 19.0
27.0 8.0
11.5
2x0.8
4x0.8
42.5
4x6.30
25.0
85
8.4
87 30
11.5
4x0.8
2x0.8
8.4
86
4x6.30
10.35
17.9
MECHANICAL DATA AVAILABLE ON REQUEST
COVER RETENTION
l High temperature winding wire
Pull : 20KgF
Push : 20KgF l Special Contact arrangements
TERMINAL STRENGTH l Special coil resistance & pick-up
Pull : 10KgF l Resistor / Diode across coil
Push : 10KgF
l For other custom solutions consult factory
DATA ON VARIOUS TESTS CONDUCTED FOR OPERATING CONDITIONS
TEST TEST CONDITION RESULT
0
Relay kept at 100 C
Coil Voltage : 14 VDC
Load given : 25 A @ 12 VDC
Continuous Energisation test at Relays successfully completed
Ex treme temperature Conditions Duration : 5 Sec. On, 5 Sec. OFF 100000 operations at given load
No. of operation : 50000
0
The above test repeated at - 30 C for 50000
operations
Relay subjected to :-
0 0
-30 C to + 100 C in 2 Hrs. with coil ON
0
+100 C for 2 Hrs. with coil ON
Thermal cycling All operating parameters within
0 0
+100 C to - 30 C in 2 Hrs. with 1 Hrs. Coil ON & the specifications af ter test
1 Hrs. Coil OFF
0
-30 C for two Hrs. with Coil ON
No. of Cycles : 3
Relay is subjected to :-
Ma x. Voltage : 100VDC
Shock Wave : Exponential Damping vibration
Shock Voltage Af ter the test, all operating parameters
Time : 500 micro Sec. of the relay are within specification.
Period : 30 Sec.
Test Time : 10 Hrs.
Dropping Impact No change in operating
Relays dropped from a height of 1 Meter to a
parameters of the relay.
concrete floor
Jump Start 24 VDC for 1 minute conducting nominal current Withstood successfully
0
at 23 C
Corrosion Resistance 5% Sodium Chloride solution No damage to relay parts
applied to relay for 48 Hrs.
Horizontal Plane:23rev. / Min.
Water Resistance test Water Pressure:0.03 Mpa No water ingression inside the relay
Test time:10 Min
*Typical values for relays with 12 VDC coil. For higher severity please consult factory
OPTIONAL SPECIAL CIRCUITRY
30 85 86 87 87 30 85 86 87 87b
1 FORM A (2 PINS 87) 1 FORM U (under introduction)
