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What is the white wire marked Vn for on a Powerpact P or R circuit breakers with Power and Harmonic trip units?

Product Line:
Powerpact P and R circuit breakers

This wire is for tapping the neutral to bring neutral voltage to the trip unit for applications requiring voltage, power, or energy functions. 
If these functions are not required or if a neutral is not present, the wire can be capped off and not used.
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