The Siemens 3VA1150-6EF42-0AA0 is a SENTRON molded case circuit breaker (MCCB) for line protection, carrying 50 A continuously at 40 °C and derating to 45 A at 70 °C. The TM240 thermal-magnetic release handles overload and short-circuit response without communication or voltage-trip options — a straightforward, non-electronic trip unit that doesn't introduce noise into the control wiring.
Breaking capacity and selectivity
Rated breaking capacity hits 220 kA at 240 V, 154 kA at 415 V, and 121 kA at 440 V — figures that give an electrical engineer real SCCR headroom for coordinating downstream devices in a distribution panel. At 500 V and 690 V the rating drops to 17 kA, so verify the available fault current on higher-voltage feeds before committing the BOM line.
Mounting and environment
The 4-pole MCCB measures 70 mm deep by 101.6 mm wide by 130 mm tall — a footprint that fits standard SENTRON panel cutouts and busbar systems. IP40 on the front means it's protected against tools and wires larger than 1 mm; no washdown rating, so keep it inside the enclosure. Operating range spans -25 °C to 70 °C, storage from -40 °C to 80 °C.