MCCB for line protection — 250 A frame, 3-pole, TM240 release
Its continuous current rating holds 250 A from 40 °C up to 50 °C, then derates to 243 A at 55 °C, 237 A at 60 °C, 230 A at 65 °C, and 223 A at 70 °C — so in a warm panel you lose about 5% per 5 °C above 50 °C.
Breaking capacity varies sharply with system voltage: 220 kA at 240 V AC, 154 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 17 kA at 690 V. At 690 V the 17 kA figure still covers most motor-drive branch circuits, but verify available fault current if feeding a large transformer.
Integration — panel fit and wiring
Dimensions: 105 mm wide, 158 mm high, 70 mm deep. The 105 mm width is standard for a 3-pole MCCB in this frame size — fits a typical 4-module (4 x 27 mm) DIN-rail footprint or direct screw-mount panel cutout. The undervoltage release (UVR) is wired separately; verify coil voltage against the control circuit before energizing.