What this 630 A MCCB delivers — and where the ratings matter
The Siemens SENTRON 3VA2463-5JP32-0AJ0 is a 3-pole molded case circuit breaker rated for 630 A continuous current at 40 °C, with the ETU550 electronic trip unit handling adjustable overload and short-circuit protection curves. That 630 A figure is the Iu rating — the breaker's base thermal capacity in open air; in a closed panel with multiple devices ganged, expect to derate per the manufacturer's table, starting at 600 A at 45 °C and stepping down to 450 A at 70 °C. The interrupting ratings climb to 187 kA at 240 V and hold at 121 kA through 440 V, then drop to 75.6 kA at 500 V and 17 kA at 690 V — so the 240 V and 415 V figures cover the two most common distribution voltages for high-fault industrial services.
Trip unit, auxiliaries, and communication — what the ETU550 brings
This variant ships without ground-fault monitoring. It includes a communication function.
Maximum power dissipation is 162 W at full rated current, so account for that heat load in the enclosure thermal design, especially when multiple breakers are side-by-side.