What this 4-pole MCCB carries
That keeps the wiring simple: power in, power out, no aux connections to pull. The interrupting ratings climb as voltage drops: 220 kA at 240 V, 154 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 17 kA at 690 V.
Thermal derating — what the 250 A actually means in a warm panel
Above that the TM240 release starts pulling back: 243 A at 55 °C, 237 A at 60 °C, 230 A at 65 °C, and 223 A at 70 °C. Dimensions are 158 mm tall, 140 mm wide, 70 mm deep. That 70 mm depth keeps the can from protruding too far past the DIN rail — useful when the gland plate is tight against the back wall.
Panel fit and mounting notes
Four-pole construction means it occupies the full width of a standard 140 mm slot in a distribution panel. The TM240 release is factory-set; no field-adjustable trip curves, so verify the 250 A continuous rating matches the downstream load before installation. Maximum power loss is 57 W at full load. In a sealed enclosure that heat has to be considered for the thermal budget — a 250 A breaker dumping 57 W into a small box can raise ambient enough to trigger the derating curve above.