Overview ZW6-21 / 630-16 (20) Outdoor vacuum circuit breakers for 12KV and below, the three-phase AC 50Hz power system, mainly used for urban and rural power and points, co-load current overload current and short circuit current use can also be used for other similar places, but also as a city-level urban 12KV grid disconnect switches. Environmental conditions a surrounding air temperature: up to + 40oC, the lower limit of -40oC b Altitude: <2000m; c relative humidity:... Daily average of not more than 95%, the monthly average of less than 90%; d pressure: not more than 700Pa (equivalent to wind speed 34m / s) e degree of air contamination by GB5582 defined as grade IV;. f earthquake intensity does not exceed 8 degrees. The main technical parameters configuration tuning parameters listed in Table 1 4.1 breaker Item Unit Parameter 1 contact opening distance mm 9 ± 1 2 contact at a distance 3 ± 1 3 Average closing speed m / s 0.6 ± 0.2 4 Average opening speed 1.0 ± 0.2 5 contact through closing bounce time ms ≤2 6 the same period of the three-phase sub-gate closing time ms ≤2 7 s ≤0.1 8 opening time maximum operating voltage ≤0.06 ≤0.1 9 minimum operating voltage of each phase circuit DC resistance μΩ ≤200 10 alternate in pitch (interrupter end) mm 193 4.2 circuit breakers rated technical parameters in Table 2 No. Item Unit Parameter 1 Rated voltage KV 12 2 Rated insulation level 1min power frequency withstand dry wet KV 42 (for earth) 34 lightning impulse withstand voltage (peak) Rated current 753 A 630 4 Rated frequency Hz 50 5 Rated short-circuit breaking current KA 12.5,16,20 6 rated short-circuit current (peak) Rated Peak 31.5,40,50 7 withstand current 31.5,40,50 8 Rated short time withstand current operation sequence 4S 12.5,16,20 9 -0.3S- sub-sub-sub-10 combined points -180S- rated short circuit current breaking times 3011 Mechanical life 1000012 rated operating voltage with CT spring operating mechanism V DC24,48V AC DC110V, 220V 13 contact permission attrition thickness mm 3 14 overcurrent Rated current A 5 15 Weight kg 130 (standard)