The Siemens 3VA1050-2ED42-0BC0 is a SENTRON molded case circuit breaker (MCCB) rated 50 A at 40 °C, with a 4-pole configuration and a breaking capacity of 52.5 kA at 240 V. It is designed for line protection and includes an undervoltage release (UVR) as standard. The rated insulation voltage is 800 V, and maximum power loss is 17.1 W.
Breaking capacity and current ratings
Breaking capacity varies with system voltage: 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. The continuous current rating holds at 50 A from 40 °C up to 50 °C, then derates to 49 A at 55 °C, 48 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. This thermal profile means the breaker can be applied in a warm enclosure without oversizing, as long as ambient stays under 50 °C.
Dimensions and panel fit
Dimensions are 70 mm deep, 101.6 mm wide, and 130 mm high. The 4-pole width of roughly 100 mm is standard for a 4-pole MCCB in this class; it mounts on a DIN rail or panel-mount base. The undervoltage release (UVR) is factory-installed, so no separate aux block is needed for that function.