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