Part identity and lifecycle
The ABB XT4HU3175AFF00NXXX is a 3-pole molded case circuit breaker from the XT4H series, carrying a 250 A frame with a TMF 175-1750 A thermal-magnetic trip block, front terminals, and a front rotary handle. It is UL/CSA rated.
What the ratings mean for fit
The 250 A frame and TMF 175-1750 A trip block mean this breaker covers a wide adjustable range for motor or feeder protection. The thermal-magnetic trip gives you inverse-time overload response plus instantaneous short-circuit protection — a common choice for panel builders who want field-adjustable pickup without swapping the entire unit. UL/CSA listing means it meets North American code requirements for branch circuit protection.