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What is the function of the Ready-to-close Switch (PF) for the NW or NT breaker?

Product Line:
Masterpact NT NW

The ready-to-close position switch (PF) indicates that the following conditions are
met and the circuit breaker can be closed:
o The circuit breaker is open.
o The closing springs are charged.
​o All interlocks are satisfied.
o There is no standing closing or opening order.

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