630 A MCCB with 330 kA interrupting capacity — line protection for high-fault panels
The Siemens 3VA2463-7HN32-0KL0 is a SENTRON molded case circuit breaker rated for 630 A continuous current at 40 °C, with a 330 kA breaking capacity at 240 V AC. That interrupting rating drops to 242 kA at 415 V and 440 V, then 187 kA at 500 V, and 9 kA at 690 V — so the SCCR headroom is highest on 208/240 V secondaries, but still substantial on 400/480 V distribution. The 3-pole design is configured for line protection (not motor or generator protection), and it carries a shunt trip release (STL) plus a full complement of auxiliary switches: two auxiliary switches, one trip alarm switch, and one electrical alarm switch (HQ configuration). The breaker's power loss is 162 W at rated load, which matters for enclosure thermal management — especially in a sealed panel with multiple breakers ganged together. The continuous current derates from 630 A at 40 °C down to 520 A at 70 °C, so if the breaker sits in a hot switchroom or near other heat sources, size the load accordingly.
Physical fit and panel integration
Dimensions: 248 mm high, 138 mm wide, 110 mm deep. That depth (110 mm) is the key clearance dimension for enclosure depth — verify the backpan-to-door clearance accommodates it, especially with the shunt trip wiring and auxiliary switch harnesses dressed behind the breaker. The width (138 mm) for a 3-pole frame is standard for this SENTRON 3VA2 series; it mounts on a mounting plate or DIN rail adapter, not direct snap-on DIN.
Auxiliary and release configuration
The breaker ships with a shunt trip (STL) for remote tripping via a control voltage — useful for emergency-stop circuits or remote shutdown schemes. The auxiliary switch block provides two form-C auxiliary contacts for status feedback, plus a separate trip alarm contact and an electrical alarm contact. No undervoltage release is fitted (that would be a different suffix). No communication module or ground-fault monitoring is included on this variant.