What this MCCB delivers on a 630 A feeder
The Siemens SENTRON 3VA2463-6JQ32-0CH0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying 630 A at 40 °C and derating to 450 A at 70 °C — so on a warm switchroom floor you lose nearly 30 % of the headline current; size the load at the ambient you actually run, not the 40 °C number. Interrupting capacity hits 242 kA at 240 V and still holds 187 kA at 415 V and 440 V — that is high enough for most utility-grade fault levels downstream of a large transformer, and it drops to 121 kA at 500 V and 9 kA at 690 V, so on a 690 V system this breaker is not your main; it is a feeder or subfeed. The adjustable thermal-magnetic trip is set with an initial value of 126 A and a full-scale value of 630 A, and a trip indicator gives you a visual flag without opening the door — useful when you are panel-walking a faulted line and do not want to break the seal on every breaker. It ships with an undervoltage release (UVR) and 2 auxiliary switches plus 1 trip alarm switch, so you can wire a remote shunt trip and status feedback into the PLC without adding external relay logic.
Panel fit and mounting
Footprint is 248 mm high by 138 mm wide by 110 mm deep — a standard MCCB form factor that drops into most SENTRON distribution panels without drilling new mounting holes. Maximum power loss is 164.5 W; factor that into the enclosure thermal budget if the panel is sealed or has limited ventilation.
Environmental limits
Operating range is -25 °C to 70 °C; storage range is -40 °C to 80 °C, so it can sit in an unheated warehouse through a winter and still commission fine.