What this MCCB is and what it does
The Siemens SENTRON 3VA2163-7MS32-0BH0 is a 3-pole molded case circuit breaker (MCCB) rated for 63 A continuous at 40 °C, with a massive 330 kA interrupting capacity at 240 V AC. That SCCR rating means it can safely clear a fault up to 330 kA without upstream devices needing to coordinate — a key spec for high-fault panels near large transformers or utility feeds. The starter protection design tailors the trip curve for motor starting inrush, so it won't nuisance-trip on a 3-phase motor start but still protects the branch circuit.
Ratings that matter for fit
Continuous current holds 63 A across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. The interrupting curve drops from 330 kA at 240 V to 242 kA at 415/440 V, then 187 kA at 500 V, and 3.7 kA at 690 V. That steep roll-off above 500 V means this breaker is optimized for 240–480 V distribution; at 690 V it's still adequate for most motor branch circuits but not for high-fault buswork. The undervoltage release (UVR) is factory-fitted, so the breaker trips automatically if control voltage drops below a threshold — standard for safety circuits and emergency-stop chains. Auxiliary switch configuration is 2 auxiliary switches plus 1 trip alarm switch HQ, giving three dry contacts for status feedback to a PLC or annunciator.
Panel integration notes
Dimensions: 181 mm height, 105 mm width, 86 mm depth. That footprint matches the standard SENTRON 3VA2 frame size — it drops into the same mounting cutout as other 3VA2 three-pole breakers. The 105 mm width means it occupies three 35 mm DIN modules (assuming standard 17.5 mm per pole spacing), so panel layout should account for that. The UVR and auxiliary switches are internal, no extra modules needed. Power loss is 6.5 W maximum — negligible for thermal budgeting in a ventilated enclosure.