63 A MCCB for line protection — what the ratings mean on the route
The 3VA1063-2ED36-0JC0 is a Siemens SENTRON 3-pole molded case circuit breaker rated for 63 A continuous at 40 °C ambient, and it holds that rating all the way to 50 °C before it starts to taper — 62 A at 55 °C, 61 A at 60 °C, 60 A at 65 °C, 58 A at 70 °C. That derating curve is what you care about if this breaker lives in a hot panel next to a motor starter or a drive; the 63 A number is only good if the cabinet stays at 40 °C or below. Breaking capacity tells you what fault it can clear without welding its contacts or blowing apart: 52.5 kA at 240 V, 32 kA at 415 V, 13.6 kA at 440 V, 7.5 kA at both 500 V and 690 V. That's a serious interrupting rating for a 63 A frame — it will handle most industrial service-entrance and feeder faults without needing a current-limiting fuse upstream. Rated insulation voltage is 800 V, so it's at home in 480 V and 600 V class panels with plenty of headroom. Power loss at full load runs 17.3 W maximum — that's heat that has to get out of the enclosure, so factor it into your thermal calculation if you're packing several breakers side by side.
Panel fit and integration
The 3VA1063-2ED36-0JC0 is a molded case circuit breaker designed for line protection — meaning it's the main or feeder breaker, not a motor circuit protector. It carries a shunt trip (STL) auxiliary release and two HQ auxiliary switches built in, so you can wire it into a safety circuit or a remote trip signal without adding external accessories. Dimensions: 130 mm tall, 76.2 mm wide, 70 mm deep. That 70 mm depth (2.76 inches) is shallow enough to fit in a standard 200 mm deep enclosure with room for wiring gutters. The 3-pole footprint is the same as other SENTRON 3VA breakers in this frame size, so it swaps in without re-drilling the mounting plate. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. That covers unheated warehouses and outdoor cabinets in most climates short of arctic conditions.