The C063H4WM is a basic frame for the Schneider Electric ComPacT NS630bH new generation — a 4-pole, 630 A air circuit breaker chassis designed for distribution duty in IEC 60947-2 environments. It ships as a manually operated, withdrawable unit without a protection control unit, meaning you select and install the trip unit separately to match your coordination study. At 690 V AC the Icu still holds at 42 kA, so it handles industrial supply voltages without derating the interrupting rating below what most plant networks need. The 630 A rating at 50 °C ambient means you can load it to nameplate in a warm enclosure — no derating curve to chase for typical panel temperatures. Withdrawable mounting (backplate, 70 mm pitch) means the chassis slides out for inspection or swap without disconnecting the main busbars, which cuts downtime on a live-panel retrofit.
Breaking capacity profile across voltages
The H rating delivers 85 kA Icu at 240 V, 70 kA at 415 V, 65 kA at 440 V, 50 kA at 525 V, and 42 kA at 690 V. The corresponding Ics (service breaking capacity) — the level the breaker can clear and still be switched back on — is 50 kA from 240 V through 440 V, then 40 kA at 525 V and 30 kA at 690 V. For a 400 V panel, the 70 kA Icu / 50 kA Ics combination gives full selectivity headroom against a downstream 50 kA-rated MCCB without forcing a larger upstream device.
The C063H4WM is a current-production item in Schneider's ComPacT NS630b...1600 new generation range.
Mechanical and electrical endurance
Rated for 10,000 mechanical cycles and up to 6,000 electrical cycles at 440 V at rated current (In), or 4,000 cycles at 690 V. At half-rated current (In/2), electrical durability extends to 6,000 cycles at 440 V and 4,000 cycles at 690 V. For a distribution board that sees a few operations per week, this endurance covers the life of the installation without contact maintenance.
IP40 front-face protection (IK07 impact resistance) suits indoor switchgear enclosures — not washdown, but fine for a dry electrical room. Neutral is on the left; connection pitch is 70 mm. Power dissipation at rated current is 19 W — negligible for panel thermal calculations but worth noting if the enclosure is densely packed.