What this MCCB carries and what it protects
The Siemens SENTRON 3VA1050-3ED42-0DC0 is a 4-pole molded case circuit breaker rated for line protection duty. It holds 50 A continuous at 40 °C ambient, derating to 45 A at 70 °C — useful to know if this lands in a crowded panel where the internal temperature runs hot. The interrupting ratings climb steeply with voltage: 75.6 kA at 240 V, 52.5 kA at 415 V, and 32 kA at 440 V, dropping to 7.5 kA at 500 V and 690 V.
Integrated auxiliaries and releases
This variant ships with an undervoltage release (UVR) and two HQ auxiliary switches already fitted — no separate ordering or field assembly needed for those functions. The UVR is designed for undervoltage release; the auxiliary switches signal breaker position back to a PLC or status lamp. The base switch assembly carries the order code 3VA10503ED420AA0.
Panel fit and environmental limits
Dimensions are 130 mm high, 101.6 mm wide, 70 mm deep — a standard 4-pole MCCB footprint for DIN-rail or panel-mount installation. Operating temperature range is -25 °C to 70 °C; storage range extends from -40 °C to 80 °C. Insulation voltage is rated at 800 V. Maximum power loss at rated current is 17.1 W — factor that into enclosure thermal calculations if the panel is sealed.