Molded case circuit breaker, XT5H 400 frame
The TMA trip combines thermal-magnetic overload and magnetic short-circuit protection, adjustable across the 400-4000 A range — meaning you set the continuous current threshold to match the load, not the other way around. The FF UL designation confirms UL 489 listing for North American panelboards and switchgear, so it slots into existing UL-rated distribution without a separate SCCR study.
Integration and deployment
Mounts in a standard panelboard or switchgear enclosure on the XT5H 400 frame footprint. The 3-pole configuration covers three-phase loads up to 400 A continuous, with the TMA trip adjustable down to 400 A for feeder or main breaker duty. The FF UL marking means it carries the full UL 489 listing for branch-circuit protection — no derating or special handling for North American installs.