ZN68-12(ZN12-12) series indoor high-voltage vacuum circuit breakerDetailed product description：

1. Overview
ZN68-12 (ZN12-12) series high-voltage vacuum circuit breaker is an indoor high-voltage distribution device with three-phase AC 50Hz and rated voltage of 12kV or below. This series of products has a simple structure, strong breaking capacity, long service life, complete operating functions, and easy maintenance. It is suitable for control and protection of power transmission and distribution systems such as power plants and substations, especially for places with frequent operations.
The operating mechanism of this series of products is spring energy storage type, which can be operated by AC or DC, or manually operated.

2. Normal usage conditions
a) Altitude: not exceeding 1000m;
b) Surrounding air temperature: maximum+40 ℃, minimum -10 ℃;
c) Relative humidity: daily average not exceeding 95%, monthly average not exceeding 90%;
d) Water vapor pressure: daily average not exceeding 2.2kPa; The monthly average value is not greater than 1.8kPa;
e) A place without fire, explosion hazard, serious pollution, chemical corrosion, and severe vibration.

3. ZN68-12 (ZN12-12) series indoor high-voltage vacuum circuit breaker specifications:

rated voltage	rated power frequency tolerance voltage	rated thunder and lightning impact tolerance voltage (Peak value)	rated short circuit Disconnect current	rated short circuit close current (Peak value)	rated short circuit sustain time	rated short circuit current Disconnect frequency	machine lifespan	rated current
kV	kV	kV	kA	kA	s	time	time	one thousand two hundred and fifty one thousand and six hundred two thousand two thousand and five hundred three thousand one hundred and fifty four thousand
twelve	forty-two	seventy-five	twenty	fifty	four	thirty	ten thousand	●
twelve	forty-two	seventy-five	twenty-five	sixty-three	four	thirty	ten thousand	●
twelve	forty-two	seventy-five	thirty-one point five	eighty	four	thirty	ten thousand	● ● ● ●
twelve	forty-two	seventy-five	forty	one hundred	four	thirty	ten thousand	● ●
twelve	forty-two	seventy-five	fifty	one hundred and twenty-five	four	thirty	ten thousand	▲

4. Main technical parameters of ZN68-12 (ZN12-12) series indoor high-voltage vacuum circuit breaker:

serial number	name	unit	data
			20kA	31.5kA	40kA
one	Rated short-circuit breaking current	kA	twenty	thirty-one point five	forty
two	Rated short-circuit closing current (peak)		fifty	eighty	one hundred
three	Rated short-time withstand current		twenty	thirty-one point five	forty
four	Rated peak withstand current		fifty	eighty	one hundred
five	Rated short-circuit duration	s	four
six	Rated short-circuit breaking current breaking times	time	thirty
seven	mechanical life		ten thousand
eight	closing time	ms	≤75
nine	Opening time		≤65
ten	Single capacitor bank breaking current	A	six hundred and thirty
eleven	Back to back capacitor bank breaking current		four hundred
twelve	Rated voltage of energy storage motor	V	DC220，110； AC220，110
thirteen	Closing voltage		DC220，110； AC220，110
fourteen	Opening voltage		DC220，110； AC220，110
fifteen	Power of opening and closing coils	W	two hundred and forty-five

ZN68-12 (ZN12-12) series indoor high-voltage vacuum circuit breaker