What this 630 A MCCB delivers
The Siemens SENTRON 3VA2463-5KP32-0AE0 is a 3-pole molded case circuit breaker rated for 630 A continuous current (Iu) at 40 °C, with an interrupting capacity of 187 kA at 240 V AC — enough to handle high-fault utility feeds or large transformer secondaries without cascading upstream. It carries the ETU850 electronic overcurrent release, which supports communication functions — meaning it can report trip events and load profiles over the SENTRON bus, useful for predictive maintenance on a 250 MW solar plant or a critical conveyor line.
At 40 °C ambient the breaker carries 630 A; derate linearly to 450 A at 70 °C (–). For a panel that runs hot — say a non-ventilated enclosure near a furnace line — the 70 °C figure of 450 A is the real continuous limit, not the nameplate 630 A. Width of 138 mm is a 3-pole frame; verify cutout spacing if swapping from a different MCCB brand. Maximum power loss is 162 W at rated current.
Interrupting performance across voltages
The interrupting capacity drops with system voltage: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 17 kA at 690 V (–). For a 480 V distribution panel the 75.6 kA rating still covers most transformer-fed services; at 690 V the 17 kA figure is adequate for downstream motor circuits but not for a main tie.