This is the fixed thermal-magnetic version, meaning the overload and short-circuit protection curves are set by the trip unit's rating and adjustments, not by an electronic trip module.
What the 250 TMA rating means for fit
The 250 TMA designation indicates a 250 A frame size with a thermal-magnetic trip unit. The thermal element provides overload protection (inverse-time curve), while the magnetic element provides instantaneous short-circuit protection. This is a standard choice for feeder circuits or large motor branch circuits where coordination with downstream devices is required. The XT4H series is designed for high breaking capacity applications, so the 250 A frame typically handles fault currents up to 50 kA at 415 VAC, though the exact SCCR depends on the specific interrupting rating of this variant — verify against the nameplate for your installation.