630 A MCCB with 187 kA breaking — selectivity headroom for high-fault panels
The Siemens 3VA2463-6KP32-0BL0 is a SENTRON molded case circuit breaker sized for 630 A continuous at 40 °C, with a three-pole configuration and a breaking capacity of 187 kA at 415 V. That 187 kA figure at 415 V means it can safely interrupt fault currents up to that level without cascading upstream — critical for main-breaker duty in high-fault industrial panels where downstream coordination depends on the upstream device holding closed through a lower-level fault. The 242 kA rating at 240 V and 121 kA at 500 V give further selectivity headroom across common voltage tiers. This breaker is designed for line protection, not motor protection — no adjustable thermal/ magnetic trip curves for motor starting inrush. It carries a communication function for remote monitoring and an undervoltage release (UVR) as the auxiliary release type, plus two auxiliary switches, one trip alarm switch, and one electrical alarm switch (HQ configuration). The UVR drops the breaker on loss of control voltage, which is standard for emergency-stop chains or undervoltage protection schemes.
Thermal derating and power loss — panel fill factor matters
The 630 A rating holds only at 40 °C ambient. Above that, derate linearly: 600 A at 45 °C, 570 A at 50 °C, 540 A at 55 °C, 510 A at 60 °C, 480 A at 65 °C, and 450 A at 70 °C. In a sealed, high-ambient panel — say a 50 °C switchroom — the usable current drops to 570 A, so size your bus and cable accordingly. Maximum power loss is 164.5 W, which contributes to the enclosure thermal budget; factor that into the ventilation or forced-air calculation for a multi-breaker lineup. Physical dimensions are 110 mm depth, 138 mm width, and 248 mm height. The 138 mm width for a 3-pole 630 A frame is standard for this class — it occupies roughly 5.4 inches of DIN-rail space. The depth of 110 mm (4.33 in) means it clears most 200 mm deep enclosures, but verify gland-plate clearance if the line-side lugs protrude rearward.
Auxiliary switch complement and UVR — pre-configured for safety circuits
The 3VA2463-6KP32-0BL0 ships with an undervoltage release (UVR) as the auxiliary release, plus two auxiliary switches, one trip alarm switch, and one electrical alarm switch (HQ designation). That means it arrives ready for remote trip indication and undervoltage protection without adding separate accessory modules. The basic switch variant is 3VA2463-6KP32-0AA0; this -0BL0 suffix adds the full complement of switches and the UVR. No ground-fault monitoring version is included — this is a line-protection breaker without integral GFCI. If ground-fault detection is needed downstream, add an external relay or specify the GF variant.