The ABB XT1SU3125ADD000XXX is a 3-pole molded case circuit breaker from the XT1S 125 series, fitted with a TMF 125-1250 thermal-magnetic trip unit rated at 125 A. The fixed front terminal configuration and UL/CSA certification make it a direct fit for North American panel builds where a compact MCCB is needed for branch-circuit protection.
The TMF trip block covers a 125-1250 A range (adjustable thermal and magnetic settings), which allows coordination with downstream loads and upstream feeders. The 3-pole design suits three-phase motor circuits, distribution panels, and feeder protection in 480 V systems.