630 A MCCB with thermal-magnetic trip — what the ratings mean for your panel
The Siemens SENTRON 3VA2463-5JQ32-0CH0 is a 3-pole molded case circuit breaker rated for line protection, carrying a full-scale current of 630 A and an adjustable overload trip range from 945 A minimum to 5 670 A maximum. That wide magnetic trip window lets you coordinate with downstream devices — set it tight for a motor branch or open for a transformer primary, all within one frame. Breaking capacity runs 187 kA at 240 V, 121 kA at 415/440 V, 75.6 kA at 500 V, and 9 kA at 690 V. At 415 V — common for industrial distribution in IEC markets — 121 kA SCCR gives you headroom for high-fault panels without cascading upstream breakers. Thermal derating is published per degree: 630 A at 40 °C ambient, dropping to 450 A at 70 °C (–). If your enclosure runs hot — say a packed MCC lineup — size the breaker for the actual ambient, not the nameplate. The 164.5 W maximum power loss needs ventilation in a sealed cabinet; factor that into your thermal budget.
Built-in auxiliaries and releases — no add-on modules needed
This variant ships with an undervoltage release (UVR) integrated, plus two auxiliary switches and one trip alarm switch (HQ) factory-fitted. That means you don't need to order separate accessory packs or open the breaker in the field — the UVR coil and signaling contacts are already in place for remote status and safety drop-out. The basic switch base is 3VA2463-5JQ32-0AA0; this -0CH0 suffix adds the UVR and communication function. If your BOM calls for the base switch plus separate UVR, this one saves a line item and a wiring step.
Physical fit — panel and switchboard dimensions
Dimensions: 248 mm height, 138 mm width, 110 mm depth. That 138 mm width is a standard 3-pole MCCB footprint for this SENTRON frame size — it fits existing Siemens mounting feet and busbar connections without adaptor plates. Depth of 110 mm clears most shallow switchboard compartments; verify gland-plate clearance if your enclosure has a rear-mounted bus.