What this 400 A MCCB delivers — and where the ratings matter
Its interrupting capacity reaches 187 kA at 240 VAC and 121 kA at 415/440 VAC, tapering to 7.5 kA at 690 VAC — so the voltage class of your installation determines which fault level this breaker can clear without upstream coordination. Thermal derating is published across the full operating range: the breaker holds 400 A from 40 °C through 50 °C, then drops to 385 A at 55 °C, 370 A at 60 °C, 355 A at 65 °C, and 340 A at 70 °C.
Dimensions are 248 mm high, 184 mm wide, 110 mm deep — a standard 4-pole MCCB footprint for 400 A frame size.