What the TMF 175-1750 A range means for selectivity
The XT4HU3175AFJ000XXX: The TMF trip unit on this XT4H 250 frame breaker covers a continuous current range from 175 A to 1750 A — that is the thermal-magnetic adjustable band, not a fixed pickup. For an integrator building a coordinated panel, the low end (175 A) sets the branch-circuit floor; the high end (1750 A) is the frame's ultimate thermal limit before the magnetic instantaneous element clears a fault.
UL/CSA listing and panel applicability
This MCCB carries UL and CSA marks — the listing covers North American panel installations where the breaker must be recognized per UL 489. The XT4H 250 frame is the physical envelope; the front terminal format (F in the order code) means the line and load conductors land on the face of the breaker, not the rear, which keeps the wiring accessible in a dead-front panel without pulling the breaker off the DIN rail.
Active production and sourcing posture
Lifecycle stage is marked current — ABB continues to manufacture this order code.