The ABB XT2HU3050AFF00NXXX is a molded case circuit breaker from the XT2H series, carrying the description XT2H 125 TMF 50-500 3P F F UL/CSA — a 125 A frame with a TMF (thermal-magnetic fixed) trip unit adjustable 50–500 A, 3-pole, with front terminals and UL/CSA certification.
The 125 A frame with a TMF 50-500 trip unit means this breaker accepts a continuous current up to 125 A, and the thermal-magnetic trip can be adjusted between 50 A and 500 A to match the protected conductor or load. The 3-pole configuration suits three-phase circuits typical in motor, feeder, or distribution panels. UL/CSA certification confirms the breaker meets North American safety standards for branch-circuit protection — relevant for panels destined for the US or Canadian market.