Introduction
In this circuit there are three magnetic contactor used in it with three overload relays.This control circuit of motor is very cheap and very useful for industries.This circuit contains only one normally closed contactor which plays an important role in this circuit.
Explanation
In the circuit there are three magnetic contactors connected to three phase supply.Each contactor is connected to each line and connected to over load relay which protects the motor very carefully.the main role performing in this circuit is a single contactor which has (normally closed contacts).When the motor starts running the single contactor starts working if any fault happened the contactor opens it's contacts and the overload relays off the motor.
Circuit Diagram
Uses
This type of control circuit is used in factory areas at a large scale.
