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On a Masterpact breaker, what polarity is Z1 in relation to Z5 and Z5?<br />

Z1 is the + (positive) side.
Z1 connects to 5v inside the trip unit through a resister, with Z2 connecting to a comparator which leads to the ASIC. When you have a restraint, the two are effectively shorted together so the Z2 sees 5v which is translated into a restraint by the ASIC

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