Now When pressed the forward start button forward contactor holds and the motor starts running in the forward direction. When any start button is pressed supply reaches the A1 point of the contactor and also on the NO point of the contactor which takes continue the contactor in the holding position. When we switch on the supply reaches through overload relay NC point and contactor NC point to start push button. Working of Forward and reverse starter diagram The output of these contactors is fed to the motor through an overload relay for the protection of the motor. Here connect the 3 phase supply to the Over Load Relay same as the input to run the motor in the forward direction but in the case of the reverse contactor, we have to reverse one phase for the reversing of the direction of the motor as shown in the diagram. One of them contactor is a forward contactor and the other is reverse contactor. The output of MCB has to connect with two contactors. In the power diagram of the forward-reverse starter connect the three-phase supply to the input of the MCB.
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