What this 3VA1150-6MH32-0AA0 is and what it does
Siemens SENTRON molded case circuit breaker, starter protection, 3-pole, 50 A at 45 °C, TM120M release, adjustable magnetic trip 350 A to 800 A. Breaking capacity is the headline here: 220 kA at 240 V, 154 kA at 415 V, and 121 kA at 440 V — that puts it in the high-interrupting class for industrial distribution where fault currents can hit 150 kA near a transformer secondary. At 500 V and 690 V it holds 7.5 kA, which is still adequate for most motor starters on those voltage levels.
Mounting and panel fit — dimensions and IP rating
The 3VA1150-6MH32-0AA0 measures 130 mm high, 76.2 mm wide, and 70 mm deep — a standard 3-pole MCCB footprint that drops into most DIN-rail or screw-mounted panel layouts without re-drilling. IP40 on the front means it's protected against tools and wires >1 mm, but not against water ingress; keep it inside a sealed enclosure in washdown areas.
Thermal derating and operating limits
Continuous current holds 50 A up to 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, near a drive bank — size the load or the breaker accordingly. Operating range is -25 °C to 70 °C; storage from -40 °C to 80 °C.