Motor Starter Relay Schematic

In the start control circuit the relay is connected in series with the battery to shorten the transmission of the large current cable length.

Motor starter relay schematic. Starter relays have appeared in various forms since the first electric starter motors were installed in automobiles. The starter relay is sometimes but not always used in addition to a starter solenoid. In this particular case i show a low voltage control circuit and a 3 phase higher voltage 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 motor starter must have at least two components to operate. 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 another switch that is used to control the starting circuit. 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 contactor to open or close the flow of energy to the motor and an overload relay to protect the motor against thermal overload. In the 3 phase motor forward reverse starter wiring diagram. Other devices for disconnecting and short circuit protection may be needed typically a circuit breaker or fuses. A starter relay acts as an electrical circuit completer or circuit breaker in between the vehicle s battery and the starter motor.

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. A relay s purpose is to interpose between the ignition switch and the powerful current hungry starting motor. This allows a minimal 12 volt signal from the ignition switch to activate a magnetic.