Introduction
In this circuit the motor is current protected and the electro thermal relay is used for the protection of the 3 phase motor.In this circuit a lamp isnused to indicate the operation of the relay that the relay is working correctly or not.
Explanation
In this circuit a simple pushbutton is used which is normally open and this button is used to start the operation.When you pull the button the operation starts and the supply now goes to the electro thermic relay which is used to protect the motor in any kind of problem like short circuit.overload etc.and then the power goes to the contactor and the contractor energizes and closes it's contacts and the motor starts running.If any abnormal condition is created then the rerlay operated and power off the supply.
Circuit Diagram
Uses
This circuit is used in small scale and also in large scale industries and factories.
