Above that temperature, derate per the IEC 60947-2 thermal curve — a panel running at 50 °C will need a higher-rated frame or active cooling to hold the same load. Category A utilisation means this breaker is not intended for selective coordination with downstream devices — it trips instantaneously on short-circuit. For selective (Category B) coordination, step up to the ComPacT NSX or NT range. Overvoltage category III means it is rated for fixed-installation distribution boards, not for equipment-level protection. No electronic adjustments, no ground-fault module. Straightforward replacement for existing TM-D breakers.
Mounts on a backplate in horizontal or vertical orientation. The 9-module pitch (12 modules at 9 mm each = 108 mm wide) and 137 mm height fit standard distribution panel cutouts. Front connections top and bottom accept compression lugs or busbars. The grey RAL 7016 colour is the standard industrial finish.