This part is for a panel builder wiring a distribution or motor feeder circuit — the TMA designation points to a thermal-magnetic trip unit for overload and short-circuit protection, sized for the 250 A frame class.
Deployment context
Mounts in a standard panel enclosure on DIN rail or direct baseplate. The XT4H frame accepts plug-in accessories (auxiliary contacts, shunt trip, undervoltage release) that share the same mounting footprint as the XT4 range — no adapter plate needed for panel retrofits. Rated for distribution duty, so it handles motor loads, lighting panels, and feeder circuits within the 250 A thermal-magnetic curve.