630 A MCCB with thermal-magnetic trip and high interrupt rating
The Siemens SENTRON 3VA2463-6JQ32-0KL0 is a 3-pole molded case circuit breaker rated for line protection, with a full-scale current of 630 A and an adjustable thermal-magnetic trip that starts at 126 A. This is the breaker you spec when the panel needs to clear a 242 kA fault at 240 V — that's the interrupting capacity at the lowest voltage point, and it scales down to 9 kA at 690 V. The real-world selection number is the thermal derating: at 40 °C it carries the full 630 A, but at 50 °C you're down to 570 A, and at 70 °C it's 450 A. If your enclosure runs hot, size the breaker for the ambient, not the label.
Breaking capacity across the voltage range
The interrupting ratings are given per voltage: 242 kA at 240 V, 187 kA at both 415 V and 440 V, 121 kA at 500 V, and 9 kA at 690 V. That 9 kA at 690 V is the weak point — if your system runs at 690 V and the available fault current exceeds 9 kA, this breaker won't clear it. For 400 V class panels, the 187 kA figure gives plenty of headroom for most industrial services.
Built-in auxiliary and alarm switches, shunt trip
The breaker ships with a complement of accessories: 2 auxiliary switches, 1 trip alarm switch, 1 electrical alarm switch (HQ type), and a shunt trip release (STL). That means you can wire remote status indication and a remote trip signal without buying add-on modules. The basic switch assembly is order code 3VA2463-6JQ32-0AA0 — if you're replacing just the switch mechanism, that's the part to pull.
Panel fit and power loss
Dimensions are 248 mm high, 138 mm wide, 110 mm deep — a standard SENTRON 3VA frame size. Maximum power loss is 162 W at full load, so factor that into the enclosure thermal budget. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The breaker includes a trip indicator and a voltage trigger for remote signaling.