Electrical Engine Starter Relay-Solenoid

An electrical engine starter relay-solenoid is a device used in automotive engines to control the starting process. It is typically located near the battery and starter motor.

The relay-solenoid acts as a switch that allows a high current to flow from the battery to the starter motor when the ignition key is turned to the "start" position. It is responsible for engaging the starter motor, which then cranks the engine to start it.

The relay-solenoid consists of a coil, a set of contacts, and a plunger. When the ignition key is turned to the "start" position, a small current flows through the coil, creating a magnetic field. This magnetic field attracts the plunger, which closes the contacts and allows the high current from the battery to flow to the starter motor.

Once the engine starts and the ignition key is released from the "start" position, the current to the coil is cut off, and the magnetic field collapses. This causes the plunger to retract, opening the contacts and interrupting the current flow to the starter motor.

The relay-solenoid is designed to handle high currents and protect the ignition switch from excessive wear and tear. It also prevents the starter motor from engaging when the engine is already running, preventing damage to the starter system.

In summary, the electrical engine starter relay-solenoid is an important component in the starting system of an automotive engine. It controls the flow of current from the battery to the starter motor, allowing the engine to start and preventing unnecessary wear on the ignition switch.