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Why isn't my NRX breaker reading voltage?

If an NRX breaker has an 1150+ or PXR25 trip unit, then it has the ability for metering voltage. However, in order to read the voltage, an external PT module must be installed and wired to the breaker.

The catalog number of the PT module is NRXDTPTM.

Up to 16 breakers can be connected to one PT module.