The ABB XT1HU3045AFF00NXXX is a molded case circuit breaker from the XT1H series, built on a 125 A frame with a TMF (thermal-magnetic fixed) trip unit adjustable from 45 to 500 A. The 3-pole configuration with front terminals and UL/CSA certification makes it a direct fit for North American panel builds where the breaker serves as the main disconnect or feeder protection in a distribution board.
The TMF trip unit adjusts from 45 to 500 A.