Overview ZW7-40.5 type outdoor low-voltage vacuum circuit breakers for the exchange of 50Hz, voltage 40.5KV three-phase power system, as breaking, closing load current, overload current and short circuit current purposes. A. take important function of the vacuum interrupter, breaking to a strong, long life, the life of 10,000 times;. B construct simple, protected from, not maintenance long period; c must stretch performance, to strong anti-purifying dirty;. D. can be equipped with a spring or electromagnetic operating mechanism, performance reliable, frequent operation; no fire and explosion hazards;. e built-in current transformers, lecturer accuracy of 0.2, to complete the three mutually movable cover;. f included condensation control device to maintain the open circuit In the positive temperature, humidity firm run implications of the use of environmental conditions Part A. ambient air temperature: the upper limit of + 40oC, the upper limit of -30oC b elevation .≤2000m (For higher altitudes, the extra degree of relevant progress theaters) c wind. pressure: not more than 700Pa (equivalent to wind speed 34 /) d Amplitude: seismic intensity of 8 degrees; e-contamination level:.. Ⅲ grade f maximum daily temperature difference: no more than 25oC important skill parameters No. Parameter names Unit 1 extra voltage KV 40.5 2 extra insulation level 1min power frequency withstand dry 95 wet (to earth) 80 lightning impulse withstand voltage (peak) 1,853 additional current A 1250,1600,2000 4 additional short-circuit breaking current KA 20,6,31.5 5 additional operations order sub -0.3s combined points -180s- combined points 6 additional short-circuit breaking times 127 extra short-circuit current (peak) KA 50,63,80 8 additional peak withstand current 9 additional short time withstand current 20, 25,31.5 10 additional short interruption of continuous current s 4 11 even opening speed m / s 1.5 ± 0.2 12 uniform closing speed of 0.7 ± 0.2 13 Contact closing bounce time s ≤2 14 three consistency (sub) gateway over the same period of the time difference ≤2 15 closing time opening time ≤150 16 ≤60 17 times Mechanical life 1,000,018 additional operating voltage and assistant circuit voltage V DC220,110,24 19 extra each phase circuit DC resistance (without transformer) DC220,110, 2420 dynamic contact permission attrition thickness mm ≤100 21 weight kg 800.