Hey, in this post we space going to view the contactor hold circuit with NO and also NC push button switches. This contactor stop circuit mainly used in the motor controller or motor starter circuit such together DOL Starter, Star Delta Starter, etc. The key objective of this holding circuit is to keep the contactor On condition even we relax the push from the NO push switch switch.
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We understand that the push-button switch provided for the engine starter has actually a building and construction as that, it only makes or breaks contact when we press the switch, when we release the press from the switch, its contact will concerned its old position.
So as soon as we usage a NO pushbutton through a contactor, the contactor will be turned on only once we press the switch. Therefore we have to make an external link that will save on the contactor till we push the NC pushbutton switch.
Three Pole, 440V Contactor(having 4 auxiliary contacts) - 1 noNC Push switch Switch - 1 noNO Push switch Switch - 1 no
Make the three-phase power link as presented in the below figure. Then attach the neutral wire with the Contactor Coil A2 terminal as displayed below.
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Take a connection from the "R" phase and also connect the NO and NC Push switch switch in series as presented in the listed below figure. Climate connect another terminal that the NO push button switch through the contactor coil A1 terminal.