The ABB XT4HU3225AFJ000XXX is a 3-pole molded case circuit breaker from the XT4H 250 A frame family, fitted with a TMF 225-2250 A adjustable thermal-magnetic trip unit. The TMF designation means the thermal element handles overloads and the magnetic element handles short-circuits, with the continuous current adjustable across the 225 A to 2250 A range via a dial on the trip unit. This is the UL/CSA listed variant with line and load lugs for panelboard or switchboard mounting.
What the ratings mean for fit
The 250 A frame size and TMF 225-2250 A trip range mean this breaker can be adjusted to protect a conductor or load anywhere within that band, which is useful when the exact full-load current is not finalized at the panel design stage. The 3-pole configuration suits three-phase systems (typical 208Y/120 V, 480Y/277 V, or 600 V delta in North American commercial and industrial panels). UL 489 listing covers branch-circuit protection; CSA C22.2 No. 5 covers Canadian installations. Line and load lugs accept copper or aluminum conductors within the terminal range specified in the installation manual.
Integration and deployment context
Mounts in a standard ABB SACE XT4 drawout or fixed cradle, or directly on a panel mounting plate via the four M8 bolt holes on the rear. The TMF trip unit is field-adjustable without removing the breaker cover. For panel builders: the lug torque values and wire bending space follow UL 508A requirements; the breaker occupies a single 3-pole space in a switchboard section. No DIN-rail mounting on this frame — it is bolted in.