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Starter Relay for Chinese Truck Parts 3708020-240 for FAW 3708020-50A

The 3708020-240 Starter Relay Assembly is a high-current control switch designed specifically for FAW Jiefang’s 24V heavy-duty truck platforms, including the J6P, J6L, JH6, J5 (New Dawei), Hanwei, and Aowei series. Functioning as an electromagnetic power amplifier, it enables a low-current signal from the ignition switch to safely trigger the high-current flow required by the starter motor — protecting both the ignition system and wiring harness from excessive load.

Commonly referred to as the "starter solenoid relay" or "motor relay," this unit plays a critical role in engine starting reliability, especially under harsh conditions such as cold weather, high altitude, or prolonged vehicle storage. Built with durable materials and robust internal contacts, it ensures fast, consistent engagement of the starter motor while minimizing voltage drop and heat generation.

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Model:
3708020-240
Brand:
FAW

Product Description

Attribute	Specification
Product Name	Starter Relay Assembly / Motor Relay
Part Number	3708020-240
Alternative Numbers	3708020-242, SORL/12V24V-SR150, ZX-SR24-150A
Voltage Rating	24V DC (standard for dual-battery heavy truck systems)
Rated Continuous Current	100A – 150A
Peak Surge Capacity	Withstands up to 1500–2000A during cranking (short duration)
Coil Power Consumption	5W – 10W
Terminal Type	4-pin or 5-pin configuration (two thick main terminals + two thin control wires)
Housing Material	Flame-Retardant Engineering Plastic (high insulation strength)
Contact Material	Thick Copper Alloy (silver-plated or tinned) – low resistance, arc-resistant
Mounting Style	Screw-mounted on chassis or near battery box
Vehicle Application	FAW Jiefang J6P, J6L, JH6, J5 Series (New Dawei, Hanwei, Aowei)
Engine Compatibility	Xichai 6DL/6DM, Dachai engines with 24V starting systems

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Parameter	Value
Operating Voltage Range	18V – 32V DC (ensures reliable operation even with weak batteries)
Main Circuit Terminals	High-conductivity copper posts (M8/M10 threaded studs)
Control Input Terminal	Small spade connector(s) for ignition “start” signal (IGN) and ground
Electromagnetic Coil Type	High-sensitivity solenoid coil optimized for low-voltage pull-in
Response Time	< 20 ms (ensures rapid actuation)
Dielectric Strength	> 1500V AC between coil and housing
Environmental Protection	Splash-proof and dust-resistant (IP54 level)
Temperature Range	-40°C to +120°C (-40°F to 248°F)
Weight	Approx. 0.4 – 0.6 kg