What it is and what it does
The Siemens SENTRON 3VA2463-7HN32-0CA0 is a 3-pole molded case circuit breaker (MCCB) rated for a continuous current of 630 A, built for line protection in industrial power distribution panels. It carries an ETU350 electronic overcurrent release, which provides adjustable protection curves without needing a separate trip unit — the release is integrated into the breaker frame. An undervoltage release (UVR) is fitted as standard, so the breaker can be tripped remotely when control voltage drops below a set threshold — useful for safety circuits or emergency-stop chains.
Interrupting capacity — what the voltages mean
The interrupting rating varies by system voltage: 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 52.5 kA at 690 V. That spread tells you this breaker is sized for high-fault infrastructure — think transformer secondaries or main feeders where available fault current is high. At 690 V the 52.5 kA rating still covers most industrial motor-control centers; the 330 kA at 240 V is overkill for branch circuits but exactly what a 240 V switchboard needs when backed by a large transformer.
Thermal derating — real-world current capacity
Rated 630 A at 40 °C ambient, but the breaker must be derated as panel temperature rises: 612 A at 45 °C, 593 A at 50 °C, 575 A at 55 °C, 557 A at 60 °C, 538 A at 65 °C, and 520 A at 70 °C. If your enclosure runs hot — common in sealed, sun-exposed or high-density panels — the 70 °C figure (520 A) is the one to design against. The maximum power loss is 164.5 W, which drives internal cabinet heating. Factor that into your ventilation or cooling budget when clustering several breakers in one enclosure.
Physical fit and panel integration
Dimensions are 248 mm high, 138 mm wide, 110 mm deep — a standard 3-pole MCCB footprint for Siemens SENTRON 3VA frames at this rating. Verify the mounting cutout and bus-bar spacing against your existing panel layout before ordering. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The storage limits govern handling and warehousing, not running conditions.