Molded case breaker, 800 A, 600 VAC, 3-pole, TMA trip
The ABB XT6HU3800BFF000XXX is a 3-pole molded case circuit breaker in the XT6H frame, rated 800 A at 600 VAC. The TMA trip unit provides thermal-magnetic protection with a fixed magnetic pickup for short-circuit and a thermal element for overload — a common choice for feeder protection in distribution panels where coordination with downstream breakers is needed.
The 800 A continuous rating at 600 VAC places this MCCB in the high-current tier for industrial distribution — sized for main feeders feeding multiple downstream subpanels or large motor control centers. The 3-pole configuration covers three-phase systems. The TMA trip unit is a thermal-magnetic design; the 'M' indicates a fixed magnetic trip setting, so it is not field-adjustable for short-circuit pickup. That matters for coordination studies: if you need adjustable magnetic pickup, you would look at the electronic trip versions in the same XT6 family.