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    120A Automotive Starter Relay, 12V/24V DC

    Purchase a 4-pin automotive starter relay with 120A contact current, coil rated voltages of 12V DC or 24V DC to meet your vehicle's needs. This auto starter relay plays a crucial role in your car's starting system, ensuring a smooth and powerful engine ignition process.
    SKU: ATO-ASR-120
    30-day Returns
    Free Shipping
    Delivery date: 6-12 days

    120 amp auto starter relay is an electrical component in the auto-starting system. Using a car 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-HST848-12/24VDC-1A
    Coil Parameter Rated Coil Voltage (2.4W/4.8W) 12V DC 24V DC
    Max. Coil Voltage 15.6V DC 31.2V DC
    Coil Resistance (Q±10%) 60Ω/30Ω 240Ω/120Ω
    Pickup Voltage (Max.) 8.5V DC 17V DC
    Release Voltage (Min.) 1.2V DC 2.4V DC
    Coil Power 2.4W/4.8W 2.4W/4.8W
    Operate Time ≤10ms ≤10ms
    Release Time ≤5ms ≤5ms
    Operation Condition Insulation 100MΩ Min. (at 500V DC)
    Dielectric Strength Between Contacts 50Hz 500V
    Between Coil and Contacts 50Hz 500V
    Shock Resistance 147m/s2
    Vibration Resistance 10~40Hz Double Amplitude 1.5mm
    Terminals Strength 20N
    Solder Ability 235℃±2℃ 3±0.5s
    Ambient Temperature -40℃~+85℃
    Relative Humidity 85% at 40℃
    Weight 102g
    Contact Parameter Contact Form 1A (SPST NO)
    Contact Material AgSnO2
    Contact Rating (Resistance) 120A/ 14V DC
    60A/ 28V DC
    Max. Switching Voltage 40V DC
    Max. Switching Current 120A
    Max. Switching Power 1680W
    Contact Resistance ≤30mΩ
    Electrical Life 1*105
    Mechanical Life 1*107

    Dimension (Unit: mm)

    120A car starter relay dimension

    Note: In case of no tolerance shown in outline dimension: outline dimension ≤1mm, tolerance should be ±0.2mm; Outline dimension 1mm and ≤5mm, tolerance should be ±0.3mm; Outlet dimension 5mm, tolerance should be ±0.4mm.

    Wiring & Installation Diagram

    120A car starter relay wiring and installation diagram

    Tips: How does an auto starter relay work?

    An auto starter relay, or starter solenoid, acts as a high-current switch to engage the starter motor, which starts the engine. When the ignition key is turned to the "start" position, a small current flows from the battery to the relay's coil, creating a magnetic field. This magnetic field pulls a plunger or closes a set of contacts within the relay, allowing a larger current to flow directly from the battery to the starter motor.

    This large current energizes the automatic starter motor, which then cranks the engine. The relay ensures that the high current required to start the motor doesn't pass through the ignition switch, which could cause it to wear out prematurely. Once the engine starts and the key is released, the circuit to the relay coil is broken, the magnetic field collapses, and the relay contacts open, stopping the current to the starter motor.

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