This is the version without undervoltage release, without ground-fault monitoring, and without communication function — a straight line-protection MCCB for distribution panels where selectivity and high fault-current interruption are the priorities. Breaking capacity is the headline here: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and still 40 kA at 690 V. Thermal derating is published across the full operating range: the breaker carries a full 400 A from 40 °C up to 50 °C, then steps down to 384 A at 55 °C, 376 A at 60 °C, 368 A at 65 °C, and 360 A at 70 °C. The 70 °C maximum operating temperature matches the upper end of most industrial enclosure ratings.
The 138 mm width for a 3-pole 400 A frame is consistent with the class; verify busbar spacing and phase-to-phase clearance if retrofitting into an existing panel that was dimensioned for a different manufacturer's 400 A MCCB. Maximum power loss is 63.5 W — that's the heat the breaker dissipates at full rated current. For a multi-breaker lineup in a sealed enclosure, that figure drives the ventilation or cooling calculation. Mechanical endurance rated at 15,000 operations.