Motor Starter Relay Schematic

The starter relay is another switch that is used to control the starting circuit.

Motor starter relay schematic.

In the 3 phase motor forward reverse starter wiring diagram. The motor starter must have at least two components to operate. 3ph starter 3ph motor reversible line voltage control double contactor three phase motor starter controlling a reversible three phase motor rev 08 aug 2006 note. A relay s purpose is to interpose between the ignition switch and the powerful current hungry starting motor.

Other devices for disconnecting and short circuit protection may be needed typically a circuit breaker or fuses. In the start control circuit the relay is connected in series with the battery to shorten the transmission of the large current cable length. It helps to boost the battery s current so that not as great a current is required at ignition. 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.

The starter relay is sometimes but not always used in addition to a starter solenoid. Starter relays have appeared in various forms since the first electric starter motors were installed in automobiles. A contactor to open or close the flow of energy to the motor and an overload relay to protect the motor against thermal overload. 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.

1 car starter wiring diagram non relay control type. 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. A starter relay acts as an electrical circuit completer or circuit breaker in between the vehicle s battery and the starter motor.