3 Phase AC Auxiliary contactor how work what is this NO,NC How check learn with practically in Hindi

full video watching open this link https://youtu.be/5t_gsiuQKPY
3 phase AC ya 3 phase motor used 
Auxiliary contactor how work what is this NO,NC How check learn with practically in Hindi very useful video for learning new technician full video watching open this link https://youtu.be/5t_gsiuQKPY

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