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

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.

Specification

Dimension (Unit: mm)

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

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.