The Siemens SENTRON 3VA1050-2ED36-0KH0 is a 3-pole molded case circuit breaker rated 50 A at 40 °C with a 52.5 kA breaking capacity at 240 V.
At 415 V the rating drops to 32 kA, and at 690 V to 7.5 kA. The 50 A thermal rating holds from 40 °C through 50 °C without derating; at 70 °C it still carries 45 A. That thermal stability means you don't have to oversize the frame for warm enclosures.
Auxiliary switching and shunt trip built in
That covers status feedback to a PLC and emergency-stop integration without adding external relay logic. The undervoltage release is not fitted on this order code — if UVR is required, specify the -0KH0 variant with that option.