What this 630 A MCCB actually delivers
The Siemens SENTRON 3VA2463-5HL42-0KK0 is a 4-pole molded case circuit breaker rated for 630 A continuous at 40 °C, with a maximum breaking capacity of 187 kA at 240 V and 121 kA at 415 V. That 187 kA figure at 240 V tells you this breaker handles high-fault scenarios without cascading upstream — it's sized for the main feeder or a large subfeed where the available fault current is serious. The continuous current derates predictably as ambient climbs: 612 A at 45 °C, 593 A at 50 °C, down to 520 A at 70 °C, so if your panel runs hot, the actual ampacity drops. It's designed as line protection, not motor protection — no undervoltage release, no ground-fault monitoring, no communication module. What it does carry is a shunt trip release (STL) and a full auxiliary switch set: one auxiliary switch, one trip alarm switch, and one electrical alarm switch HQ, which gives you remote status on trip and breaker position without extra add-on modules.
Panel fit and mounting constraints
The breaker occupies 184 mm width, 248 mm height, and 110 mm depth — that's 7.24 by 9.76 by 4.33 inches. It's a DIN-rail or direct-panel mount, typical for SENTRON 3VA frames at this current level. The 4-pole configuration means it needs four phase connections plus neutral if the system requires it. The shunt trip (STL) and auxiliary switches are factory-fitted, so no field wiring of separate accessories — just land the power conductors and the control wires for the shunt trip coil and the auxiliary contact outputs. Verify the panel depth clears the 110 mm plus wiring space behind the breaker.
Breaking capacity by voltage — selectivity planning
The interrupting capacity drops sharply above 500 V: 75.6 kA at 500 V, then only 9 kA at 690 V. That 9 kA at 690 V is the hard limit — if your system runs 690 V line-to-line and the fault current exceeds 9 kA, this breaker won't clear it. For 240 V and 415 V systems it's extremely capable (187 kA and 121 kA respectively), so it's a strong choice for the main breaker in a 480Y/277 V panel where the available fault current is high. The minimum trip setting is 945 A, maximum 5 670 A, which gives you a wide adjustment range for coordination with downstream devices.