The Siemens SENTRON 3VA2440-5HN32-0JA0 is a 3-pole molded case circuit breaker rated 400 A continuously at 40 °C, built on a 4800 A frame. That frame size means the internal mechanism and arc chambers are designed for fault currents up to 4800 A — the breaker's interrupting capacity is what changes with system voltage: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 9 kA at 690 V. For a 400 A feeder on a 480 V or 400 V distribution board, the 121 kA SCCR at 415 V gives substantial headroom above typical available fault current, so selectivity with downstream breakers is practical without oversizing. Designed for line protection, so it's suited for feeder circuits rather than motor or generator protection.
Three-pole design with no undervoltage release and no auxiliary switch fitted as standard; the shunt trip occupies the auxiliary release slot.
Maximum power loss is 63.5 W at rated current.