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. 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.
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
Max power loss is 14.6 W, so heat dissipation in the enclosure is manageable.
Environmental range
The -25 °C lower limit is fine for most climates — no special cold-weather derating needed down to that point.