ZN28A-12 Series of Indoor HV Vacuum Circuit Breaker for Sale

Product Description

ZN28A-12 Series of Indoor HV Vacuum Circuit Breaker

General Description
ZN28A-12 fixed type indoor HV vacuum breaker is used for many kinds of switchgear like GG-1A(F), XGN2-12(Z).
It is widely used for 12kV voltage systems which is in accordance with GB1984-2003 standards.

Structural characteristics:
1.This vacuum circuit breaker adopts air insulation, it can meet air distance and creepage under normal run condition.
2.The operating mechanism can use CD10,CD17A,CT19A or CT17G type mechanism,the outlet curve has good adaptation 
  for the requirements of vacuum interrupters. It has high reliable with characteristic of long life and easy maintenance.
3.Suitable for varies sites and the work places which have rigorous run condition,
  especially suitable for reconstruction of old-fashioned oil switch.  
 
Applying ambient conditions
1.Ambient temperature:-15~+40ºC.
2.The height above sea level:≤1000m(besides the special requirements).
3.Relative humidity:the average humidity of a day should be no more than 95%;the average humidity of a month should be no more than 90%.
4.Saturated vapor pressure:the average pressure of a day should be no more than 2.2kPa:the  average pressure of a month should be no more than 1.8kPa.
5.Earthquake intensity:not exceed 8 degrees.
6.It should be installed in the places without fire,explosion,serious filth,and chemical erosion and violent vibration.

  Main Technical Specification

S.N	Name		Unit	Data
1	Rated voltage		kV	12
2	Rated frequency		Hz	50/60
3	Rated current		A	630	630	1250	1600
				1000	1000	1600	2000
				1250	1250	2000	2500
							3150
4	Rated short circuit breaking current		kA	20	25	31.5	40
5	Rated peak withstand current		kA	50	63	80	100
6	Rated short-circuit duration		S	4
7	Rated power frequency withstand voltage	Between phases, phase to ground	kV	42
		Between gaps	kV	48
8	Rated lightning impulse withstand voltage	Between phases, phase to ground	kV	75
		Between gaps	kV	85
9	Rated operating sequence			O-0.3S-CO-180S-CO      O-180S-CO-18S-CO              (above 40kA)
10	Rated breaking current of single capacitor bank		A	630
11	Rated breaking current of bank to bank capacitor bank		A	400
12	Electrical endurance class		Cycle	30
13	Mechanical endurance		Cycle	10000
14	Clearance between open contacts		mm	11±1
15	Contact stroke of contacts		mm	4±1
16	Out of simultaneity of CO operation of three poles		ms	≤2
17	Contact bouncing duration at closing operation		ms	≤2
18	Closing time		ms	50~100
19	Opening time		ms	20~60
20	Average closing speed		m/s	0.6±0.2
21	Average opening speed		m/s	1.1±0.2
22	Main circuit resistance of each pole		μΩ	≤40		≤30
23	DC component			50%(Max.)

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