What this MCCB gives you
The Siemens 3VA2163-8JQ32-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 63 A continuous current across the full ambient range of 40 °C to 70 °C — no derating needed up to that ceiling. Three poles, line protection design, and a communication function onboard mean it talks to your control system while protecting the feeder. Breaking capacity hits 440 kA at 240 V, 330 kA at 415 V and 440 V, 220 kA at 500 V, and 52.5 kA at 690 V, so it handles high-fault utility feeds without cascading upstream.
Selectivity and coordination
The 63 A frame with 440 kA at 240 V SCCR gives you headroom for selective coordination downstream — the breaker stays closed on a branch fault below its instantaneous pickup, letting the downstream device clear it. Insulation voltage rated 800 V means it's comfortable on 690 V line-to-line systems common in heavy industrial panels. The 3-pole form factor fits standard 3-phase distribution.
Panel fit
Dimensions: 105 mm wide, 181 mm tall, 86 mm deep — a standard MCCB footprint for a 63 A frame. Mounts on a DIN rail or direct-panel with the appropriate base adapter. The 86 mm depth leaves room for rear-access wiring in a 200 mm deep enclosure. Communication wiring exits the front face; keep a 50 mm clearance above for the cable bend radius.