The Siemens SENTRON 3VA1150-3EF42-0AA0 is a 4-pole molded case circuit breaker (MCCB) from the 3VA line-protection family, sized for a 50 A continuous load at 40 °C ambient. The TM240 thermal-magnetic release handles overloads and short-circuits without external trip units — a fixed-release design that keeps the BOM simple and eliminates setup errors on the panel floor.
This MCCB delivers 75.6 kA at 240 V AC, 52.5 kA at 415 V, 32 kA at 440 V, and 11.9 kA at both 500 V and 690 V. The steep drop above 440 V means the 3VA1150-3EF42-0AA0 is best suited for 240 V delta or 400/415 V wye distribution panels where fault currents stay under 50 kA — at 690 V the 11.9 kA figure still covers most industrial transformer secondaries, but verify the available fault current on the line side before committing the BOM.
Rated current holds at 50 A from 40 °C through 50 °C, then drops to 49 A at 55 °C, 48 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. The 70 mm depth and 101.6 mm width fit standard 4-pole MCCB mounting footprints;