The ABB XT4HQ3150FFF000XXX is a molded case circuit breaker from the XT4H 250 frame family, fitted with an EKIP LSI electronic trip unit rated at 150 A and configured as a 3-pole unit with front terminals (F F) carrying UL/CSA listing. The EKIP LSI trip provides long-time, short-time, and instantaneous protection curves, giving selectivity headroom downstream of a main breaker or upstream of a distribution panel. At 150 A on a 250 A frame, this breaker leaves thermal margin for higher-fault-current coordination without upsizing the enclosure footprint.
Sourcing & compliance
The EKIP LSI trip unit is field-adjustable via the front dials, so the 150 A rating can be fine-tuned within the frame's range without swapping the trip unit.