Motor Starter Relay Schematic

Starter relays have appeared in various forms since the first electric starter motors were installed in automobiles.

Motor starter relay schematic.

The motor starter must have at least two components to operate. A contactor to open or close the flow of energy to the motor and an overload relay to protect the motor against thermal overload. Other devices for disconnecting and short circuit protection may be needed typically a circuit breaker or fuses. 1 car starter wiring diagram non relay control type.

In this particular case i show a low voltage control circuit and a 3 phase higher voltage motor. A relay s purpose is to interpose between the ignition switch and the powerful current hungry starting motor. The starter relay is sometimes but not always used in addition to a starter solenoid. In short this the complete guide of forward reverse starter.

A very common form of latch circuit is the simple start stop relay circuit used for motor controls whereby a pair of momentary contact pushbutton switches control the operation of an electric motor. L1 becomes t3 and l3 becomes t1 when the reverse relay is actuated the motor must be stopped before reversing unless the contactor allows for on the fly reversing. The starter relay is another switch that is used to control the starting circuit. A starter relay acts as an electrical circuit completer or circuit breaker in between the vehicle s battery and the starter motor.

In the start control circuit the relay is connected in series with the battery to shorten the transmission of the large current cable length. I shown the 3 pole mccb circuit breaker 2 magnetic contactor normally open normally close push button switch thermal overload relay 3 phase 4 wire system supply 3 phase motor with connection trip indicator light etc. In the 3 phase motor forward reverse starter wiring diagram.