The XT4HU3125AYJ000XXX: The NEXT4H 250 frame indicates a 250 A rated continuous current frame, while the TMF 125-1250 trip unit covers adjustable thermal-magnetic protection from 125 A up to 1250 A. The 3-pole configuration suits three-phase power distribution and motor branch circuits. UL/CSA listing means it is accepted in North American panels without additional agency review — a time-saver for panel builders shipping to the US or Canada.
Integration Notes
The front-terminal (F F) design simplifies bus-bar and cable connections in panel layouts. The XT4H series mounts on standard DIN rail or panel-mount backplates. For a 3-pole 250 A frame, allow adequate side clearance for heat dissipation — typical manufacturer guidance calls for 25 mm minimum between adjacent breakers at rated load.