Industrial and residential Square D circuit breaker enclosures designed to be tough, reliable and provide exceptional performance in the most grueling conditions. Current transformers are available for applications requiring ground-fault protection on three-phase, four-wire systems or for neutral protection and metering. This neutral current transformer kit is used for PowerPact M- and P-frame enclosures with different NEMA ratings. Current transformer applicable only on PowerPact P circuit breakers. Current limitations are 400–800 A and 400–1200 A respectively for the M800 and P1200 family of enclosures.