The Siemens SENTRON 3VA1050-3ED32-0KA0 is a 3-pole molded case circuit breaker (MCCB) rated for 50 A continuous at 40 °C ambient, with a TM210 thermal-magnetic fixed release and an integrated shunt trip (STL) for remote tripping. This suits feeder circuits where the load is well-characterized and you don't need adjustable overloads — common in fixed-load distribution, lighting panels, or as a main disconnect for a sub-panel.
This MCCB delivers 75.6 kA interrupting capacity at 240 V AC, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at both 500 V and 690 V. For a 400 V panel with a 50 kA SCCR, this breaker's 52.5 kA at 415 V provides headroom.
Above that, it derates linearly: 49 A at 55 °C, 48 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. Maximum power dissipation is 14.6 W — relevant for heat buildup in a multi-breaker enclosure.