ZW7-40.5 series outdoor high-voltage vacuum circuit breakerDetailed product description：

Scope of application:
The ZW7 series circuit breaker is suitable for use in three-phase AC 50Hz, 40.5kV power systems as a means of breaking and closing load currents, overload currents, and short-circuit currents. It can be used for the control and protection of power equipment and power lines in power plants and substations, as well as in places with frequent operations. It is an ideal product for the upgrading and replacement of the oil-free transformation of the 40.5kV old substation.

ZW7-40.5 series outdoor high-voltage vacuum circuit breaker model:



ZW7-40.5 outdoor high-voltage vacuum circuit breaker (hereinafter referred to as the circuit breaker) is used in three-phase power systems with AC 50Hz and voltage of 40.5kv, for breaking and closing load current, overload current, and short-circuit current.
a、 Adopting vacuum arc extinguishing, with strong breaking ability, long electrical life, and mechanical life of 10000 times:
b、 Simple structure, maintenance free, long maintenance free cycle;
c、 Good insulation performance and strong anti pollution ability;
d、 Can be equipped with spring or electromagnetic operating mechanism, reliable mechanical performance, and can be operated frequently; No fire and explosion hazards;
e、 The internal current transformer has a measurement accuracy of 0.2 level and can achieve three-phase differential protection;
f、 Equipped with a leakage controller, it can protect the circuit breaker from reliable operation under certain temperature and humidity conditions.


a. Surrounding air temperature: upper limit+40 ℃, lower limit -30 ℃ (general areas), -40 ℃ (high-altitude areas);
b. Altitude: ≤ 1000m (if altitude needs to be increased, the rated insulation level should be correspondingly raised);
c. Wind pressure: not exceeding 700pa (equivalent to a wind speed of 34m/s);
d. Amplitude: The seismic intensity does not exceed 8 degrees;
e. Pollution level: Level III;
f. Maximum daily temperature difference; Not exceeding 25 ℃

3、 Main technical parameters of ZW7-40.5 series outdoor high-voltage vacuum circuit breaker

serial number	name			unit	data
one	rated voltage			KV	forty point five
two	Rated insulation level	1-minute power frequency withstand voltage	Dry test		ninety-five
			wet test		eighty
		Lightning impulse withstand voltage (peak value)			one hundred and eighty-five
three	rated current			A	1250; 1600; two thousand
four	Rated short-circuit breaking current			KA	20;25; thirty-one point five
five	Rated operating sequence				Min-0.3s HeFen-180s HeFen
six	Rated short-circuit breaking current times			time	twelve
seven	Rated short-circuit closing current (peak)			KA	50;63; eighty
eight	Rated peak withstand voltage
nine	Rated short-time withstand current				20;25; thirty-one point five
ten	Rated short-circuit duration			S	four
eleven	Average opening speed			M/S	1.5±0.2
twelve	Average closing speed				0.7±0.2
thirteen	Contact closing bounce time			MS	≤２
fourteen	Three phase closing (opening) synchronization time difference				≤２
fifteen	closing time				≤150
sixteen	Opening time				≤60
seventeen	mechanical life			time	ten thousand
eighteen	Rated operating voltage and rated voltage of auxiliary circuit			V	DC 110/220
					AC 110/220
nineteen	Direct resistance of each static circuit (excluding transformers)			μΩ	≤100
twenty	Allowable wear thickness of dynamic and static contacts			MM	three
twenty-one	weight			KG	eight hundred

ZW7-40.5 series outdoor high-voltage vacuum circuit breaker