What the 4000 A AC-23A rating means for your isolation point
The ENW24172 is a 3-pole switch disconnector from the Schneider Electric EasyPact NW range, rated 4000 A in utilisation category AC-23A at 690 V AC. Drawout mounting means the chassis slides out of its cradle for inspection or replacement without disturbing the busbars — a key feature for main incomers or tie-breakers in distribution switchboards where downtime matters.
Short-circuit performance and isolation integrity
Rated short-time withstand current (Icw) is 55 kA for 1 second or 30 kA for 3 seconds — that's the fault current the switch can carry without welding its contacts until an upstream breaker clears. Short-circuit making capacity (Icm) is 121 kA at 50/60 Hz, meaning it can close onto a bolted fault of that magnitude. The switch is certified for isolation per IEC 60947-3, with a visible contact position indicator and an impulse withstand voltage of 12 kV.
Mechanical and electrical endurance — what 20 000 cycles means on a main switch
Electrical durability under AC-23A load is 5000 cycles at 440 V or 2500 cycles at 690 V without maintenance. For a main disconnector that may be operated only a few times a year, that's effectively a lifetime component. If your application cycles it daily (e.g. as a machine isolator), the 2500-cycle figure at 690 V becomes a real planning number.
Installation footprint and environmental limits
Dimensions are 441 mm wide × 439 mm high × 395 mm deep. Rear connection terminals with a pitch of 115 mm without spreader. Mounts on a rail in a drawout cradle.