What this 3VA1163-5EF32-0BC0 brings to a panel
Breaking capacity across voltages — where it fits
The interrupting performance drops as line voltage climbs: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at both 500 V and 690 V. That 17 kA floor at 690 V still covers most industrial 690 V distribution, but the real muscle is in the 240–440 V range where this breaker outruns many comparably sized MCCBs. For a 480 V panel (common in North America), the 75.6 kA at 440 V is the closest published figure — derate slightly for 480 V, but it's still well above typical 480 V available fault currents in most plants.
Thermal performance and enclosure planning
The 63 A rating holds flat from 40 °C to 50 °C, then derates to 62 A at 55 °C, 61 A at 60 °C, 60 A at 65 °C, and 58 A at 70 °C. Maximum power loss is 19.8 W, which is modest for a 3-pole 63 A MCCB and won't drive significant internal temperature rise in a properly ventilated panel. Dimensions are 70 mm deep, 76.2 mm wide, 130 mm tall — fits standard Siemens 3VA mounting footprints.