The ABB XT1NU3125AFD000XXX is a 3-pole molded case circuit breaker (MCCB) from the XT1N 125 frame series, fitted with a TMF 125-1250A thermal-magnetic fixed trip unit. The description confirms UL and CSA listing, which governs acceptance in North American panelboards and switchgear. The TMF trip provides thermal overload protection (inverse-time) and magnetic short-circuit protection (instantaneous), sized for the 125-1250A range — meaning the trip unit is set for a specific ampere rating within that band, not field-adjustable across the full span.
What the Ratings Mean for Fit
The XT1N 125 frame is a compact MCCB designed for 125 A maximum continuous current at 40 °C, though the TMF trip unit on this variant is specified for the 125-1250A range — the actual trip rating must be verified from the nameplate or factory setting, as the order code alone does not resolve the exact ampere trip. The 3-pole configuration suits three-phase circuits. UL 489 listing means it is certified for branch-circuit protection in North America; CSA C22.2 No. 5 covers the same for Canada. Panel builders should confirm the interrupting rating (not stated in this listing) matches the available fault current at the point of installation.