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Industrial Controls: Mpcb, Basic question

i have 4 motors, every motor have its own micro switch and also these have start and stop position, that micro switch will close or open their contacts. 
the picture that attached is  NO contact of AUX's MPCB (motor protection circuit breaker) and i get it from
this pdf
 (in page 19).
i want to know, how can i control red circle (see picture that attached)? or how this NO  is actuated?

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