630 A MCCB with adjustable trip and high interrupting capacity
The Siemens SENTRON 3VA2463-5JQ32-0CA0 is a 3-pole molded case circuit breaker rated 630 A at 40 °C, designed for line protection in main distribution panels and large motor control centers. Its adjustable thermal-magnetic trip unit spans 945 A minimum to 5 670 A maximum — a 6:1 ratio that lets you dial in the exact overload and short-circuit threshold for the downstream load without swapping the breaker frame. Breaking capacity runs 187 kA at 240 V AC, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 9 kA at 690 V. That 187 kA figure at 240 V covers high-fault utility feeds; the 121 kA at 415 V handles most European industrial distribution. At 690 V the 9 kA rating still clears a fault on a 690 V drive line, but you'd verify coordination with the upstream transformer impedance. Thermal derating is published per degree: 630 A at 40 °C, 600 A at 45 °C, 570 A at 50 °C, 540 A at 55 °C, 510 A at 60 °C, 480 A at 65 °C, 450 A at 70 °C. If your panel ambient runs 50 °C, size the load at 570 A continuous — the breaker won't nuisance-trip on a hot day. Maximum power loss is 164.5 W, which matters for enclosure heat rise calculations.
Dimensions, mounting, and auxiliary options
The breaker measures 248 mm high, 138 mm wide, 110 mm deep — a standard SENTRON 3VA frame size that bolts into existing switchboard mounting plates. The 110 mm depth (4.33 in) leaves room behind the panel door for wiring gutters and auxiliary modules. An undervoltage release (UVR) is built in — part of the order code suffix — so the breaker drops out on loss of control voltage, which is typical for emergency-stop circuits and safety disconnects. Communication function is present, meaning it can integrate with a higher-level monitoring system via optional communication modules. The auxiliary switch designation is "without" on this variant; if you need auxiliary contacts for status feedback, that's a separate order code or field-addable accessory.