The interrupting capacity is 187 kA at 240 V, 121 kA at 415/440 V, 75.6 kA at 500 V, and 11.9 kA at 690 V — so at typical 400 V distribution voltages it clears a 121 kA fault without cascading upstream. That SCCR headroom matters when you are coordinating a main breaker downstream of a transformer or tying into a high-capacity bus. Thermal derating is published: the breaker carries 400 A continuously at ambient temperatures from 40 °C to 50 °C, then steps down to 392 A at 55 °C, 384 A at 60 °C, 376 A at 65 °C, and 367 A at 70 °C.
The breaker measures 184 mm wide, 248 mm high, and 110 mm deep — a 4-pole frame that fits standard panel-mount cutouts for this class.