The Siemens SENTRON 3VA1150-3EF36-0JH0 is a 3-pole molded case circuit breaker (MCCB) rated for 50 A continuous current at 40 °C, with a TM240 thermal-magnetic overcurrent release and an integrated shunt trip (STL) auxiliary release. The interrupting ratings tell you where it can clear a fault: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 10.5 kA at 690 V.
Above that, it starts to taper: 48 A at 55 °C, 47 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C.
Physical fit and auxiliaries
The breaker measures 76.2 mm wide, 130 mm tall, and 70 mm deep — a standard 3-pole MCCB footprint for a 50 A frame.
The integrated auxiliary trip uses a separate order code (3VA9688-0BL32) — if you're replacing a failed unit, make sure that shunt trip module comes with the new breaker or is ordered alongside it.