What it is and what the ratings mean
The Siemens SENTRON 3VA2463-5HM32-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated for 630 A continuous current at 40 °C, with an interrupting capacity of 187 kA at 240 V and 121 kA at 415 V. That 187 kA at 240 V means it can safely clear a fault current up to 187,000 A — enough for high-fault utility feeds or transformer secondaries where the available short-circuit current is extreme. At 690 V the interrupting capacity drops to 9 kA, so if your system runs at 690 V, this breaker is only suitable for low-fault locations. The rated insulation voltage is 800 V, giving headroom for 690 V networks. The thermal-magnetic trip unit has an adjustable Ir (continuous current setting) from 126 A to 630 A, so you can fine-tune it to match the actual load — a 400 A feeder, for instance, can be set without swapping the frame. The full-scale value is 630 A. There is no trip indicator, no undervoltage release, and no communication function; this is a basic line-protection breaker with ground-fault summation monitoring on the L conductors. Temperature derating is built in: at 45 °C the continuous rating is 612 A, at 50 °C it is 593 A, and at 70 °C it drops to 520 A. If your panel runs hot — say 55 °C inside — you still have 575 A of headroom. The maximum power loss is 162 W, so ventilation in the enclosure matters.
Where it goes and how it mounts
This MCCB is designed for fixed mounting in a distribution panel or switchboard. Dimensions are 248 mm high, 138 mm wide, and 110 mm deep — a 3-pole frame that fits standard Siemens SENTRON mounting plates. No DIN-rail clip; it bolts directly to the panel backplate or busbar system. The depth of 110 mm means it clears most standard enclosure doors with room for cable bending.