The thermal-magnetic trip unit (TM-D) provides overload protection via a bimetal element and short-circuit protection via a solenoid, both factory-set and non-interchangeable.
Deployment context
Mounts on a backplate (not DIN rail) in horizontal or vertical orientation. Front-front connections accept compression lugs or busbars, with a 35 mm connection pitch (27 mm without spreaders). The 12-module 9 mm pitch footprint — 108 mm wide, 137 mm high, 80 mm deep — fits standard distribution panel layouts.
Operating altitude 2000 m without derating, 5000 m with derating. Relative humidity range 0–95 %. Electrical durability: 20,000 cycles at 440 V at In/2, 10,000 cycles at 440 V at In. Mechanical durability: 20,000 cycles.