It is designed to sit in a main distribution panel or sub-feed, protecting cables and downstream switchgear against overload and short-circuit faults.
Interrupting capacity — the headline number
At 415 V it still clears 121 kA, and at 440 V it holds 75.6 kA. Those are high-interrupting ratings for a 20 A frame — meaning it handles fault currents strong enough to weld a standard breaker shut. At 500 V and 690 V the rating drops to 17 kA, which still covers most industrial 480 V and 600 V class installations.
Thermal rating and derating
Rated 20 A continuous at 40 °C. The TM210 holds that full 20 A all the way up to 55 °C. At 60 °C it derates to 19 A, and stays at 19 A through 70 °C. That is a tight thermal curve — the breaker sheds only 1 A over a 30 °C rise. Means the panel builder can load it close to nameplate without chasing derate tables for every extra degree.
Width is 101.6 mm (4 in), depth is 70 mm, height is 130 mm. Inside a typical IP54 or IP65 enclosure it is fine.