What the ratings mean for fit
The Siemens SENTRON 3VA1050-2ED42-0AC0 is a 4-pole molded case circuit breaker (MCCB) rated 50 A at 40 °C, with a TM210 thermal-magnetic overcurrent release designed for line protection. The 52.5 kA interrupting capacity at 240 V tells you it can clear a bolted fault at that level without welding contacts or rupturing the case — critical for meeting the SCCR on a panel label. At 415 V the breaking capacity drops to 32 kA, and at 690 V it's 7.5 kA, so the voltage you're coordinating against determines the available fault current this breaker can handle.
Thermal derating and continuous current
The 50 A rating holds from 40 °C through 50 °C ambient. Above that it derates: 49 A at 55 °C, 48 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. If this breaker sits in a warm enclosure — say near drives or transformers — the 70 °C figure (45 A) is the one to use for continuous load. The 800 V rated insulation voltage (Ui) gives headroom for 480 V or 600 V class systems.
Panel integration and mounting
The breaker measures 101.6 mm wide, 130 mm high, and 70 mm deep — a standard MCCB footprint that fits most DIN-rail or panel-mount enclosures without re-drilling. The 4-pole configuration suits three-phase plus neutral applications, common in North American and European distribution panels. Power loss is 14.6 W maximum, so account for that heat in the enclosure thermal budget.
Approvals and compliance documentation
As a Siemens SENTRON series MCCB, this breaker carries UL, CSA, and IEC certifications for global panel acceptance. RoHS and REACH compliance documentation is available from the manufacturer. The TM210 release provides thermal-magnetic protection with fixed settings — no ground-fault monitoring version is included on this variant.