ABB XT5HU340ABYN000XXX NEXT5H 400 TMA 400-4000 3P FF UL

The XT5HU340ABYN000XXX: The TMA trip unit combines a thermal element for overload protection and a magnetic element for short-circuit protection, both adjustable across the 400-4000 A range. The 400 A continuous rating is the breaker's nominal current; the adjustable range allows fine-tuning to the actual load without swapping the breaker. Three-pole construction suits three-phase power distribution in switchboards, panelboards, or motor control centers. UL 489 listing means it is accepted for branch-circuit protection in North American installations.