The Siemens SENTRON 3VA1050-4ED42-0CH0 is a 4-pole molded case circuit breaker (MCCB) rated for 50 A at 40 °C, with a breaking capacity of 121 kA at 240 V AC. The 4-pole configuration covers three-phase-plus-neutral or three-phase with a switched neutral, common in North American and IEC panel builds. The thermal-magnetic trip holds 50 A continuous through 55 °C, then derates to 49 A at 55 °C and 45 A at 70 °C — useful to know if the breaker lands in a hot enclosure or next to other heat sources.
Breaking capacity across voltage levels
The 3VA1050-4ED42-0CH0 delivers 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V. For 480 V systems the 52.5 kA at 440 V is the closest reference; actual performance at 480 V will be between the 440 V and 500 V figures.
The breaker measures 130 mm high, 101.6 mm wide, and 70 mm deep — a 4-pole MCCB in a compact footprint that fits standard Siemens 3VA mounting plates and busbar systems.