What this MCCB is and what it does
The Siemens 3VA2463-6HN32-0DA0 is a 3-pole SENTRON molded case circuit breaker (MCCB) rated for line protection, with a continuous current of 630 A at 40 °C and a maximum interrupting capacity of 242 kA at 240 V. It's designed to sit in a distribution panel or switchboard protecting feeders and large loads against short circuits and overloads. The interrupting curve drops to 187 kA at 415 V and 440 V, then to 121 kA at 500 V, and 9 kA at 690 V — so the available fault current at the installation point determines which voltage rating governs the selection. The breaker includes an undervoltage release (UVR) for coordinated load shedding or safety disconnects when line voltage drops below a threshold — no auxiliary switch is fitted, and there's no ground-fault monitoring module on this variant. The basic switch (the breaker mechanism without accessories) is order code 3VA2463-6HN32-0AA0, which is the core unit this release gets bolted onto.
Current derating across ambient temperature
The 630 A rating is at 40 °C ambient. In a warm panel — say 50 °C — the breaker carries 593 A continuous; at 60 °C it's 557 A; at 70 °C it's 520 A. If the panel runs hot, size the upstream transformer or bus for the derated value, not the nameplate 630 A. Power loss at max rated current hits 164.5 W, which adds to the enclosure's thermal load — factor that into the ventilation or cooling budget.
Physical fit and mounting
Dimensions are 248 mm high, 138 mm wide, 110 mm deep — a standard MCCB footprint for this current class. Mounts on a backplate or DIN-rail adapter in a panel; the 110 mm depth leaves room behind a 200 mm deep enclosure door without the breaker body hitting the gland plate. No communication function on this variant — it's a standalone thermal-magnetic or electronic trip unit (the spec doesn't detail the trip type), so no comms wiring needed beyond the power and UVR coil.