What this MCCB is and where it lands
The Siemens 3VA1163-5MH32-0AA0 is a SENTRON molded case circuit breaker (MCCB) designed for starter protection — meaning it's built to sit ahead of a motor starter combination, not just as a feeder breaker. Rated 63 A at 40 °C with a TM120M thermal-magnetic release, it handles the inrush and overload profile of motor loads without nuisance tripping on startup. Three poles, 800 V rated insulation voltage, and a front IP40 rating — it's panel-mount, intended for enclosed distribution boards or motor control centers where the front face is behind a door.
Breaking capacity — the number that decides coordination
At 240 V it interrupts 187 kA; at 415 V it's still 121 kA; at 440 V it drops to 75.6 kA; at 500 V and 690 V it holds at 7.5 kA. That steep fall-off above 440 V is the key selection constraint — if your system fault current at 690 V exceeds 7.5 kA, this breaker won't clear it, and you need a higher-rated frame or upstream current-limiting fuse.
Thermal derating and panel fit
Full rated current holds at 63 A up through 50 °C ambient. At 55 °C it derates to 62 A, at 60 °C to 61 A, at 65 °C to 60 A, and at 70 °C to 58 A. In a sealed, tightly packed panel that runs hot, that derating curve is your real-world ampacity — don't size the load to 63 A if the enclosure ambient is over 50 °C. Dimensions: 130 mm high, 76.2 mm wide, 70 mm deep. That 76.2 mm (3-inch) width is the standard 3-pole MCCB footprint — it drops into the same DIN-rail or panel-mount slot as other SENTRON 3VA frames of this size class.