Siemens SENTRON 3VA1150-4ED36-0AA0 — 50 A MCCB for Line Protection
The Siemens SENTRON 3VA1150-4ED36-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated 50 A at 40 °C, designed for line protection in distribution panels. It carries a 121 kA breaking capacity at 240 VAC, tapering to 75.6 kA at 415 V and 52.5 kA at 440 V, with 11.9 kA available at both 500 V and 690 V — meaning it handles high fault currents on the low-voltage side of a transformer, but the interrupting rating drops sharply above 500 V, so verify the available fault current at your system voltage before specifying. The TM210 thermal-magnetic release provides fixed overload and short-circuit protection without adjustable trip settings — a straightforward choice for standard feeder circuits where you don't need the tuning flexibility of an electronic trip unit. Rated insulation voltage is 800 V, and the power loss maxes out at 14.6 W under full load, so factor that into enclosure thermal calculations. Mounts on a DIN rail or panel base with a 76.2 mm width (3 in) and 70 mm depth (2.76 in), taking three pole spaces in a standard distribution board. The front face carries IP40 protection — fine for a dry indoor panel, but not for washdown or outdoor exposure.
Current Derating and Thermal Performance
Rated 50 A from 40 °C through 50 °C ambient, then derates to 49 A at 55 °C, 48 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. If your panel runs hot — say, above 50 °C — you lose roughly 1 A per 5 °C rise. Operating range spans -25 °C to 70 °C; storage from -40 °C to 80 °C.
Lifecycle and Sourcing
Listed as current production. Sourced and quoted to order against an RFQ through independent distribution.