What this MCCB carries and where it fits
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. That 220 kA interrupting capacity at 240 V means it can sit upstream of a distribution board and still clear a bolted fault without the arc flashing past the breaker — the kind of headroom you spec when the transformer is close and the fault current is real. At 415 V it still holds 154 kA, and at 690 V it derates to 17 kA, so the SCCR planning needs to match the actual line voltage, not the headline number. 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.
Thermal derating and real-world current
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. The TM210 release is a fixed thermal-magnetic curve, not electronic, so there is no adjustment dial; the trip characteristic is set at the factory for general line protection.
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. The operating temperature range spans -25 °C to 70 °C, with storage from -40 °C to 80 °C, so it handles cold warehouse storage and hot running conditions without issue.