Panel-builder commissioning notes
The ABB XT1HU3025AFF00NXXX is a 3-pole molded case circuit breaker from the XT1H series, fitted with a TMF 25-500 thermal-magnetic trip unit. The TMF designation means the thermal element is fixed at 25 A while the magnetic pickup is adjustable from 25 A to 500 A — so you set the instantaneous trip threshold to coordinate with downstream devices, not the continuous rating.
The XT1HU3025AFF00NXXX carries UL and CSA approvals as stated in its description — accepted for North American installations without additional agency review. The UL listing covers the breaker as a branch-circuit protective device per UL 489; CSA certification mirrors the same standard for Canadian code compliance.