The C10H4TM040C is a 40 A, 4-pole ComPacT NSX100H moulded-case circuit breaker from Schneider Electric's current-production ComPacT NSX line. The headline breaking capacity is 100 kA Icu at 220/240 V AC, 70 kA at 380/415 V, and still 10 kA at 660/690 V — all per IEC 60947-2. That 'H' suffix in NSX100H means the high-breaking version; in a 415 V distribution board this breaker clears a 70 kA fault without upstream fuses needing to operate, which simplifies coordination studies and lets you keep the same SCCR downstream.
Backplate-mounted, 140 mm wide × 161 mm high × 86 mm deep. Front connections both top and bottom. Neutral on the left, 4-pole with neutral protection set at 1 × Ir (full-rated neutral). Five accessory slots available for auxiliary contacts, shunt trips, or under-voltage releases. IP40 finger protection on the front face; IK07 impact resistance per IEC 62262.
Mechanical endurance is 50,000 cycles. Electrical endurance varies with load: 50,000 cycles at 440 V at half rated current, 30,000 at full rated current, and 10,000 at 690 V full load. Utilisation category A (non-frequent switching, typical for distribution rather than motor starting).
