The Siemens SENTRON 3VA1150-6ED46-0AA0 is a 4-pole molded case circuit breaker rated 50 A at 40 °C, built around the TM210 thermal-magnetic overcurrent release. The 70 mm depth and 101.6 mm width put it in the standard SENTRON 3VA footprint — it clips onto the mounting plate or DIN rail adapter without stealing extra gutter space. IP40 on the front keeps dust out of the mechanism in a clean panel environment; no washdown rating here, so keep it behind a gland plate if the enclosure sees hose spray.
The 50 A rating holds flat from 40 °C up to 50 °C, then drops a notch per 5 °C step: 49 A at 55 °C, 48 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. That means if the panel ambient runs at 55 °C — common in a packed enclosure next to a drive — you lose only 1 A, so the breaker still carries a 48 A continuous load without nuisance tripping.
Power loss and thermal budget
Maximum power loss is 14.6 W at rated current. That is the heat the breaker dumps into the enclosure — relevant when calculating the panel's thermal rise, especially if the MCCB sits in a sealed box alongside other heat sources.