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    40A Waterproof Automotive Starter Relay, 12V/24V DC

    Affordable price waterproof car starter relay designed with 40A contact current comes in contact forms of 1Z (1C) or 1H (1A) and offers coil rated voltages of 12V DC or 24V DC. Choose between 4 pin or 5 pin installation options. This automotive starter relay is a key component in an auto's starting system, serving as a crucial link between the ignition switch and the starter motor.
    SKU: ATO-ASR-40
    30-day Returns
    Free Shipping
    Delivery date: 6-12 days

    Car starter relay is an electrical component in the auto-starting system. Using an automotive starter relay helps protect the ignition switch from high current loads and ensures reliable engine starting. It also prevents voltage drops, making the starting process more efficient and effective. The automotive starter relay is critical to the overall performance and life of the vehicle's electrical system and starting system.


    Model ATO-JD2912-1H-12/24VDC
    Coil Parameter Rated Coil Voltage 12V DC 24V DC
    Rated Current 150mA 75mA
    Coil Resistance (Ω±10%) 80Ω 320Ω
    Operate Voltage (Max.) 6~8V DC 12~16V DC
    Release Voltage (Min.) 0.6~3.6V DC 1.2~7.2V DC
    Applicable Voltage (Max.) 15.6V DC 31.2V DC
    Operation Condition Insulation Resistance 100MΩ Min. (at 500V DC)
    Dielectric Strength Between Contacts 500V AC (for one minute/sec)
    Between Coil and Contacts 750V AC (for one minute/sec)
    Shock Resistance Operating Extremes 10g
    Damage Limits 20g
    Vibration Resistance 10~55Hz 1.5mm
    Release Time 7ms
    Operate Time 5ms
    Ambient Temperature -30℃~+80℃
    Relative Humidity 40~85%
    Weight 35g
    Safety Standard CCEE Certification
    Contact Parameter Contact Form 1Z (1C)/ 1H (1A)
    Contact Material AgSnO12
    Contact Rating (Resistance) NO: 40A 14V DC
    Max. Switching Voltage 75V DC
    Max. Switching Current 40A
    Max. Switching Power 560W
    Contact Resistance 100mΩ Max. at 6V DC 1A
    Electrical Life 100000 Operations (at 30 Operations/Minute)
    Mechanical Life 10000000 Operations (at 30 Operations/Minute)

    Starter Relay Dimension (Unit: mm)

    40A waterproof car starter relay dimension


    Plug Dimension (Unit: mm)

    40A waterproof car starter relay plug dimension

    Wiring Diagram

    40A waterproof car starter relay wiring

    Tips: What is the difference between a car starter relay and other types of relays?

    Car starter relays are significantly different from other types of relays in design and function. Automotive starter relays are mainly used to control the current during engine start, and they must be able to withstand high current loads and frequent starting operations. Generally, car starter relays are designed to be more durable and reliable to cope with the high power requirements when the engine is started.

    On the other hand, general relays may be designed for lower-power applications such as home electronic devices, industrial control systems, or electrical equipment. They may use different contact materials and structural designs to accommodate different current and voltage requirements. General relays may focus more on long-term reliability and precise electrical control, rather than emphasizing stability and durability under extreme conditions like car starter relays.

    Therefore, the main difference between auto starter relays and other types of relays lies in their designed use, the current load they withstand, and the requirements of the operating environment.


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