The Siemens SENTRON 3VA1050-3ED32-0KC0 is a 3-pole molded case circuit breaker rated for 50 A continuous current (Iu) with a TM210 thermal-magnetic overcurrent release. It carries 75.6 kA interrupting capacity at 240 V and 52.5 kA at 415 V, so it handles high-fault utility feeds and transformer secondaries without cascading upstream. The front panel is IP40 rated — fine for a clean indoor panel, but not for washdown zones.
Key Ratings & Fit
The 50 A continuous rating holds flat from 40 °C to 50 °C, then derates to 45 A at 70 °C — a 10 % drop across the full operating range, so a panel at 60 °C still gets 47 A. The interrupting curve is steep: 75.6 kA at 240 V drops to 7.5 kA at 690 V. For a 480 V delta service (common in North American industrial), the 32 kA at 440 V is the closest published point — enough for most 25 kA SCCR panels, but verify against your transformer impedance. The shunt trip (STL) auxiliary release is built in; the auxiliary contact version carries 2 HQ switches (form C). No undervoltage release, no ground-fault monitoring, no communication module — this is a straight line-protection MCCB.
Integration
Mounts on a standard DIN rail or panel-mount base. Footprint is 76.2 mm wide by 130 mm tall by 70 mm deep — fits a 4-inch deep enclosure with room for finger-safe gland plates. The 2 auxiliary switches (HQ type) are pre-wired; wire them to the PLC digital input for breaker status feedback. Rated insulation voltage is 800 V, so it can sit on a 690 V line with proper phase barriers.