Rated current and interrupting capacity
The 3VA1450-4EE42-0AA0 is a Siemens SENTRON molded case circuit breaker rated 500 A at 40 °C, with the same rating holding through 50 °C and derating to 452 A at 70 °C — so in a warm panel you lose about 48 A off the top. The interrupting capacity is 121 kA at 240 V, 75.6 kA at 415 V and 440 V, 52.5 kA at 500 V, and 11.9 kA at 690 V; that 121 kA figure at 240 V means it handles a serious fault on a low-voltage distribution bus without the upstream breaker needing to coordinate.
Overcurrent release and configuration
The overcurrent release is the TM220 type — a thermal-magnetic design for line protection, meaning it uses a bimetal strip for overload and a magnetic coil for short-circuit, no electronic adjustment. It's a 4-pole breaker, rated insulation voltage 800 V, and the front carries IP40 protection (finger-safe but not sealed against dust ingress).
The case measures 248 mm tall, 184 mm wide, 110 mm deep — that 184 mm width across 4 poles means a standard 4-pole MCCB footprint, so it drops into the same DIN-rail or panel-mount cutout as other SENTRON 4-pole frames. Depth at 110 mm leaves room for rear busbar connections in a typical 400 mm deep enclosure.