MCCB for line protection — 80 A, 4-pole, TM240 trip
The TM240 thermal-magnetic overcurrent release handles both overload and short-circuit events without external control power — the bimetal element tracks load heating, while the magnetic coil responds to instantaneous fault currents. Breaking capacity is voltage-dependent: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at both 500 V and 690 V, which covers most low-voltage distribution panels and motor control centers where the available fault current at the bus is known.
The breaker maintains its full 160 A current rating from 40 °C through 50 °C ambient, then derates to 158 A at 55 °C, 155 A at 60 °C, 153 A at 65 °C, and 150 A at 70 °C. That means in a sealed enclosure with internal temperature rise, you lose only about 6 % of capacity at the 70 °C ceiling — usable headroom for a densely packed panel. Dimensions are 130 mm high, 101.6 mm wide, and 70 mm deep; the 4-pole width (101.6 mm) matches the standard SENTRON 4-pole footprint, so it drops onto a DIN rail or mounting plate in the same cutout as other 3VA frames. Front-side IP40 protection keeps dust and tools out of the mechanism; the rear terminals remain accessible for busbar or cable connection per the panel builder's wiring practice.
The TM240 designation on the overcurrent release means the thermal element is calibrated for a 240 A frame; the 80 A rating is set by the installed rating plug or fixed trip setting inside that frame.