The Siemens 3VA1050-4ED32-0JC0 is a SENTRON molded case circuit breaker, 3-pole, rated 50 A at 40 °C with an interrupting capacity of 121 kA at 240 V. That interrupting rating at 240 V means it can clear a fault up to 121 kA without welding or rupturing, which is the figure that governs panel SCCR coordination on a 240 V service. The 50 A continuous rating holds steady up to 50 °C, then derates to 49 A at 55 °C and 45 A at 70 °C — so in a warm enclosure you lose 5 A off the top end.
Interrupting ratings and selectivity
The 3VA1050-4ED32-0JC0 carries interrupting ratings across common system voltages: 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. That 75.6 kA at 415 V is the number to check for a 400 V three-phase panel — it gives headroom for most transformer-fed services. The 800 V rated insulation voltage means the breaker's internal clearance is designed for 690 V line-to-line systems.
Dimensions and panel fit
The 3VA1050-4ED32-0JC0 measures 70 mm deep, 76.2 mm wide, and 130 mm high. That 76.2 mm width is a 3-pole frame size — it occupies three 25.4 mm module positions on a DIN rail. The 70 mm depth lets it fit shallow enclosures where a deeper MCCB would hit the door or backplane.
Auxiliary and shunt trip options
This variant ships with 2 auxiliary switches (HQ type) and a shunt trip release (STL). The auxiliary switches provide status feedback for PLC or SCADA — one normally-open and one normally-closed contact per switch, wired to the control circuit. The shunt trip allows remote tripping from an E-stop or safety relay, which is standard for emergency-off circuits. Max power loss is 14.6 W, so heat dissipation in the enclosure is manageable.
Environmental range
Operating temperature range is -25 °C to 70 °C, with storage from -40 °C to 80 °C. That covers most indoor panel environments, including unheated warehouses. The -25 °C lower limit is fine for most climates — no special cold-weather derating needed down to that point.