The TM240 thermal-magnetic release provides overload and short-circuit protection for feeder and distribution circuits in industrial panels and building power distribution. Rated interrupting capacity reaches 220 kA at 240 V AC and 154 kA at 415 V AC, dropping to 17 kA at 500 V and 690 V — the SCCR headroom at lower voltages makes this breaker suitable for high-fault-capacity main or subfeed positions where coordination with upstream gear is critical. The 70 mm depth by 76.2 mm width footprint fits standard 3-pole MCCB panel cutouts and DIN-rail adapter plates; the 130 mm height clears typical enclosure gland plates without interference.
Thermal Derating and Ambient Performance
At 55 °C it derates to 49 A, at 60 °C to 48 A, at 65 °C to 46 A, and at 70 °C to 45 A. For a panel running warm — say 55 °C internal ambient — the breaker still carries 49 A continuous, which is within typical design margins for a 50 A feeder.