Breaking capacity across voltage levels
The 3VA1050-3ED36-0KH0: This MCCB delivers 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at 690 V. The steep drop at 690 V is typical for a 50 A frame — the internal arc energy scales with voltage, and the 3VA1050 frame is optimized for the 400–480 V range where most industrial loads sit. For a panel fed from a 415 V supply with a transformer secondary capable of 50 kA fault current, this breaker lands comfortably inside its interrupting envelope.
Auxiliary contacts and shunt trip fitted
The 3VA1050-3ED36-0KH0 ships with 2 auxiliary switches plus 1 trip alarm switch (HQ configuration) and an integrated shunt trip release (STL) for remote tripping. The auxiliary contact block is factory-installed — no separate ordering or field fitting needed. The shunt trip coil part number is 3VA9688-0BL33, documented as the integrated auxiliary trip assembly. This makes the breaker ready for remote emergency-stop or PLC-based trip circuits out of the box.
Panel fit and environmental limits
Dimensions are 130 mm high, 76.2 mm wide, and 70 mm deep — a standard 3-pole MCCB footprint that fits Siemens 3VA1050 switchboard mounting or individual DIN-rail adapters. Front face carries IP40 protection; the breaker body is not sealed against dust ingress from the sides, so panel builders should maintain clearance to live busbars per the device manual. Operating ambient range is -25 °C to +70 °C, with storage from -40 °C to +80 °C. Current derating begins at 55 °C: 48 A at 55 °C, down to 45 A at 70 °C.