630 A MCCB with headroom for high-fault panels
The Siemens SENTRON 3VA2463-5HN32-0CL0 is a 3-pole molded case circuit breaker rated for 630 A continuous at 40 °C, with interrupting capacity of 187 kA at 240 V and 121 kA at 415 V — enough to handle most transformer-fed or generator-backed distribution sections without cascading upstream. That 187 kA at 240 V means it can sit at the main lug of a panel fed by a large utility transformer and still clear a bolted fault without the arc flash energy exceeding the breaker's rating — the SCCR headroom is real, not a marketing number. The breaker carries a continuous-current derating curve from 630 A at 40 °C down to 520 A at 70 °C, so if the panel ambient runs hot (say 50 °C inside a non-ventilated enclosure), the usable rating drops to 593 A — plan the load schedule against that number, not the 40 °C sticker.
Interrupting capacity across voltage bands
At 690 V the interrupting capacity drops to 9 kA — this breaker is not intended for 690 V high-fault service. The 5670 A minimum and maximum rating (likely the magnetic trip threshold for short-circuit protection) is a fixed value on this variant — no adjustable short-time pickup, so selectivity with downstream breakers depends on that fixed magnetic band.
Active production, built-in undervoltage release
The breaker ships with an undervoltage release (UVR) integrated, which means it will trip if the control voltage drops below a set threshold — useful for preventing automatic restart after a brownout or for coordinating with an emergency-stop circuit that kills the control power. Auxiliary switching is handled by two auxiliary switches, one trip alarm switch, and one electrical alarm switch (HQ type) — enough to signal status back to a PLC or annunciator panel without adding external interposing relays.
Panel fit and integration
Dimensions are 248 mm high, 138 mm wide, 110 mm deep — standard for a 630 A SENTRON frame, so it will drop into existing Siemens MCCB mounting bases without re-drilling the backplate. The basic switch (the replaceable switching mechanism) is order code 3VA2463-5HN32-0AA0 — if the breaker takes a fault that damages the contacts, you can swap the mechanism without pulling the entire enclosure. Rated for operation from -25 °C to 70 °C, storage from -40 °C to 80 °C — the storage range is wider because the breaker isn't dissipating heat; the operating limit is what governs the derating curve above.