The C63L3 is a ComPacT NSX630L basic frame — the bare breaker body without a trip unit, rated 630 A at 40 °C, 3 poles. It carries a 150 kA Icu at 415 VAC, so it clears high-fault currents on the distribution bus without cascading upstream.
The 150 kA Icu at 415 VAC means the breaker survives a single fault at that level and still switches afterward; the service breaking capacity Ics is 150 kA at 380/415 VAC, so it can reclose and carry load after clearing a fault at that voltage — not all frames match Ics to Icu at every voltage point, but here they align at 415 V. Overvoltage category III suits fixed-installation distribution boards downstream of the main service entrance. The 8 kV impulse withstand voltage (Uimp) confirms it handles switching surges on a 690 VAC system.
Deployment context
Mounts fixed to a backplate — no DIN rail here. The 140 mm width, 255 mm height, and 110 mm depth need panel cutout planning; the 45 mm connection pitch matches standard busbar spacing for a 630 A frame. Front-front connections on both sides simplify busbar runs in a distribution board but mean you need access to the front for both line and load terminations.