SENTRON 3VA2063-5KP32-0BC0 — 63 A MCCB for Line Protection
The Siemens SENTRON 3VA2063-5KP32-0BC0 is a 3-pole molded case circuit breaker rated for 63 A continuous current, designed for line protection in distribution panels. Its interrupting capacity hits 187 kA at 240 V, dropping to 121 kA at 415 V and 440 V, then 75.6 kA at 500 V, and 3 kA at 690 V — so it handles high-fault scenarios on the secondary side of a step-down transformer or at a service entrance where available fault current is substantial. The 63 A rating holds steady across the full ambient range from 40 °C to 70 °C, meaning no derating is needed in a warm enclosure. This breaker includes a communication function, an undervoltage release, and two auxiliary switches (HQ type) — so it can report its status to a PLC or BMS and trip on loss of control voltage. The kit is complete: the breaker ships with the UVR and aux switches integrated, no separate accessory modules to order. The line-protection design means the trip curve is optimized for cable and busbar protection rather than motor starting, so match it to a feeder or main breaker role, not a motor branch circuit.
Panel Fit and Mounting
Dimensions are 105 mm wide, 181 mm tall, and 86 mm deep — a standard SENTRON 3VA frame size that fits existing panel cutouts and busbar arrangements. The 86 mm depth leaves clearance for rear-connected busbars and wiring troughs. Mounting is via screw-clamp to a mounting plate or DIN rail adapter (not included in the base breaker), so verify the panel's backplate layout before committing the BOM line.
Environmental and Compliance
Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. Power loss at rated current is 7.9 W maximum — relevant for thermal budgeting in a sealed enclosure. The breaker carries a trip indicator (no) and voltage trigger (no), so it's a thermal-magnetic or electronic trip unit without a separate shunt-trip as standard. Ground-fault monitoring is not included in this variant.