Siemens 3VA1050-3ED42-0JC0 — 50 A 4-Pole MCCB with Shunt Trip
The Siemens 3VA1050-3ED42-0JC0 is a 4-pole SENTRON molded case circuit breaker (MCCB) designed for line protection, rated at 50 A continuous current across a 40 °C to 50 °C ambient range before derating begins. It carries a 75.6 kA interrupting capacity at 240 V, stepping down to 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at both 500 V and 690 V — the voltage-dependent break curve you need to check against your available fault current at the panelboard. This MCCB includes a factory-fitted shunt trip (STL) release and two auxiliary switches (HQ design), giving you remote trip capability and status feedback without adding external modules. The rated insulation voltage is 800 V, and maximum power loss at rated current is 14.6 W — a figure to factor into enclosure thermal calculations when grouping multiple breakers.
Thermal Derating and Operating Range
The breaker holds its full 50 A rating from 40 °C through 50 °C ambient. Above that, it derates linearly: 49 A at 55 °C, 48 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. If your panel ambient runs hot — say, a sealed enclosure near a furnace line — use the 70 °C figure (45 A) as your continuous load limit. Operating temperature range is -25 °C to +70 °C; storage range is -40 °C to +80 °C.
Physical Fit and Panel Integration
Dimensions are 130 mm height, 101.6 mm width, 70 mm depth. The 4-pole width (101.6 mm) is standard for a 4-pole MCCB in this frame size — verify your DIN-rail or mounting-plate spacing allows the full pole count plus wiring bend radius. No undervoltage release or ground-fault monitoring is fitted on this variant; those functions would need a different order code or external add-ons.