The ABB XT1HU3125AFD000XXX is a 3-pole molded case circuit breaker from the XT1H 125 frame series, fitted with a TMF 125-1250 thermal-magnetic fixed trip unit. The description confirms UL/CSA certification, meaning it carries the listings required for North American panel builds — a detail that matters when the inspector checks the nameplate against the one-line.
The TMF 125-1250 trip unit covers an adjustable thermal-magnetic range from 125 A to 1250 A, which governs the continuous current rating and the short-circuit protection threshold. The XT1H 125 frame is a compact MCCB sized for panelboard and distribution applications where space is tight but fault current ratings need to hold. The 3-pole configuration suits three-phase loads — motor branch circuits, feeder protection, or main disconnect duty in a UL 508A industrial control panel.