What the 630 A / 242 kA ratings mean for fit
The Siemens SENTRON 3VA2463-6KQ32-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated 630 A at 40 °C ambient — that's the continuous current it carries without tripping in a 40 °C panel. Above that temperature the rating steps down: 600 A at 45 °C, 570 A at 50 °C, 540 A at 55 °C, 510 A at 60 °C, 480 A at 65 °C, and 450 A at 70 °C. If your enclosure runs hot, size the breaker at the derated figure, not the 630 A headline. Breaking capacity hits 242 kA at 240 V AC, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 9 kA at 690 V. The 242 kA figure at 240 V means this breaker handles the full available fault current on a high-capacity 240 V service without upstream fusing — useful for large transformer secondaries or bus-riser feeds. At 690 V the 9 kA rating is modest; verify the available fault current at that voltage before committing.
Trip unit, communication, and protection features
Fitted with the ETU860 electronic overcurrent release — programmable LSIG protection (long-time, short-time, instantaneous, ground fault). The ground-fault monitoring uses summation-current formation on the L-conductor, and N-conductor protection is adjustable from OFF to 20 %–160 %. Communication function is built in, plus an 'Other Measurement Function' capability for power monitoring. Rated insulation voltage is 800 V, operating voltage at AC rated value 690 V. The front face carries IP40 protection — fine for a closed panel, not for washdown areas. No undervoltage release and no voltage trigger on this variant.
Panel fit — dimensions and mounting
Dimensions: 248 mm high, 138 mm wide, 110 mm deep. That's a 3-pole MCCB footprint for a 630 A frame — expect a screw-clamp or bolted connection, not a plug-in base. Panel layout needs clearance for the ETU interface and communication wiring on the front face.