SENTRON 3VA1050-2ED42-0AD0 — Line Protection MCCB
The Siemens 3VA1050-2ED42-0AD0 is a 4-pole molded case circuit breaker from the SENTRON 3VA series, designed for line protection. It carries a TM210 thermal-magnetic release and is rated 50 A continuous at 40 °C ambient, derating to 45 A at 70 °C. Breaking capacity hits 52.5 kA at 240 V and 32 kA at 415 V, so it handles high-fault utility feeds without cascading upstream. Panel builders: the 70 mm depth and 101.6 mm width fit standard SENTRON mounting footprints. Rated insulation voltage is 800 V, and maximum power loss is 14.6 W — factor that into enclosure thermal rise calculations.
Current Rating and Thermal Derating
Full 50 A holds up to 50 °C ambient without derating. At 55 °C it drops to 49 A, at 60 °C to 48 A, at 65 °C to 46 A, and at 70 °C to 45 A. That means in a warm enclosure — say 55 °C internal — you lose 1 A of headroom; at 70 °C you lose 5 A. Size the continuous load against the derated figure for the actual panel temperature, not the 40 °C nameplate.
Breaking Capacity Across Voltages
The interrupting ratings climb as voltage drops: 52.5 kA at 240 V, 32 kA at 415 V, 13.6 kA at 440 V, and 7.5 kA at both 500 V and 690 V. For a 480 V delta service (typically 480Y/277), the relevant figure is the 440 V or 500 V column — 13.6 kA or 7.5 kA, respectively. Verify the available fault current at the installation point against these values to confirm SCCR compliance.