Switch disconnector for distribution, rated 250 A across AC and DC utilisation categories
It carries a conventional free-air thermal current Ith of 250 A at 50 °C and a rated operational current Ie of 250 A across AC-22A, AC-23A, DC-22A, and DC-23A utilisation categories per EN/IEC 60947-3. Rated operational voltage reaches 690 V AC 50/60 Hz and 750 V DC (3 poles in series), with an insulation voltage Ui of 800 V AC and impulse withstand Uimp of 8 kV. The device is certified for isolation (suitability for isolation per EN/IEC 60947-3) and carries a visible contact position indicator. Short-time withstand current Icw is 3.5 kA for 1 s or 3 s, and 1.35 kA for 20 s. Short-circuit making capacity Icm reaches 330 kA with an upstream protection circuit breaker, or 4.9 kA for the switch-disconnector alone.
Integration — panel mounting and environmental ratings
Fixed backplate mounting with a 35 mm connection pitch. Dimensions: 161 mm height, 105 mm width, 86 mm depth. IP40 enclosure protection (IEC 60529) and IK07 impact resistance (IEC 62262).
Electrical durability and mechanical life
Electrical durability varies by utilisation category and voltage: 15,000 cycles at 440 V AC In/2 (AC-22A/AC-23A), 7,500 cycles at 440 V AC In, 6,000 cycles at 690 V AC In/2, 3,000 cycles at 690 V AC In. DC durability: 10,000 cycles at 250 V DC In/2 (1 pole), 5,000 cycles at 500 V DC In (2 poles in series).