The Schneider Electric A9S60440 is an Acti9 iSW switch disconnector — a 4-pole, 40 A device rated for isolation duty at 415 V AC. It is designed to provide visible-break isolation and control of downstream circuits in distribution boards or sub-panels, compliant with IEC 60947-3 for switch-disconnector performance. Rated 40 A in AC-22A utilisation category (EN/IEC 60947-3), it handles mixed resistive and inductive loads typical of general distribution switching — not motor starting, but isolation and load-break for lighting, heating, and small power circuits. The toggle mechanism provides local ON/OFF indication with a positive contact position indicator, confirming the visible-break isolation requirement for lockout/tagout procedures.
Snap-on DIN-rail mounting (fixed mode) with a 72 mm width footprint — occupies 8 modules of 9 mm pitch on the rail. Rated insulation voltage 500 V AC, impulse withstand 6 kV — adequate for 415 V line-to-line systems with typical surge coordination.
For a 3-phase 415 V distribution, that's roughly 28 kVA of load capacity. Electrical durability of 20,000 cycles and mechanical durability of 50,000 cycles define the expected service life under rated load. In a panel that sees daily switching, this translates to roughly 10–15 years of service before contact wear becomes a concern. Operating temperature range -20 to 50 °C with 95% relative humidity at 55 °C — the tropicalisation class 2 confirms suitability for warm, humid environments without derating.