The Siemens 3VA1050-3ED32-0AF0 is a SENTRON molded case circuit breaker (MCCB) for line protection, designed to fit a 3-pole configuration with a TM210 thermal-magnetic overcurrent release. It carries a rated current of 50 A at 40 °C ambient, derating to 45 A at 70 °C, so the continuous load needs to be checked against the panel's worst-case operating temperature. Breaking capacity runs from 75.6 kA at 240 V down to 7.5 kA at 690 V, covering most industrial distribution fault levels.
Ratings and what they mean for fit
The 50 A rating holds flat from 40 °C to 50 °C, then drops 1 A per 5 °C step to 45 A at 70 °C. For a panel that runs at 55 °C, the breaker is good for 49 A continuous — that 1 A difference matters if the load is right at the nameplate. The TM210 release is a fixed thermal-magnetic type, so no interchangeable trip unit; the breaker is ordered to the amp rating and that's what it protects at. Breaking capacity is voltage-dependent: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at both 500 V and 690 V. At 690 V the 7.5 kA figure is the limiting factor — if the available fault current at the panel exceeds that, this breaker won't clear it and you need a higher-rated frame. Rated insulation voltage is 800 V, which covers 690 V systems with margin. Power loss at full load is 14.6 W maximum — a non-trivial heat source in a densely packed enclosure; account for it in the thermal budget.
Physical fit and auxiliary configuration
The breaker measures 76.2 mm wide, 130 mm high, and 70 mm deep. The 3-pole width is a standard MCCB footprint for a 50 A frame, so it slots into existing SENTRON mounting bases or DIN-rail adapters without panel modification. Comes with one auxiliary switch and one trip alarm switch (HQ type) factory-fitted — no need to order those separately for basic status feedback.