ZN28A-12-陕西西电通中电器有限公司

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ZN28A-12

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Indoor High Voltage Vacuum Circuit Breaker

ZN28A-12

1.General Description

ZN28A-12 fixed type indoor HV vacuum breaker is widely used for kinds

of switchgears such as GG-1A(F)& XGN2-12 (Z).It is widely used for I2k

V voltage systems which is accordance with G81984-2003 standards.

Structural characteristics:

1.The vacuum circuit breaker adopts air insulation.which meet air distance and creepage under normal run condition.

2.The operating mechanism is used CD10,CD17A ,CT19A or CT17G type mechanism,the outlet curve has good adaptation for requirement of vacuum interrupters.It owns high reliable ,long life and easy maintenance.

3.Suitable for varies sites and work places which have rigorous run condition.especially suit for re-construction of old-fashioned oil switch.

2.Applying conditions:

Ambient temperature;-10℃----+40℃

Relative humidity:daily average ≤95%,monthly average ≤90%

Seismic intensity ：≤8

Saturated vapor pressure：daily average ≤2.2kPa，monthly average≤1.8kPa；

Altitude：≤1000m；（Not including special requirement）

Service environment：should be avoided fire, explosion risk, serious pollution, chemical corrosion and violent vibration

3.Technical specification：

No.	Item	Unit	Data
1	Rated voltage	kV	12
2	Rated frequency	Hz	50/60
3	Rated power frequency withstand voltage/1min	kV	42
4	Rated lighting impulse withstand voltage	kV	75
5	Rated current	A	630	1250	1600	2000	2500	3150
6	Rated short circuit breaking current Rated short time withstand current(4s)	kA	20
			25	25
				31.5	31.5	31.5	31.5
					40	40	40	40
7	Rated short circuit making current(peak) Rated withstand current(peak)	kA	50
			63	63
			80	80	80	80	80
				100	100	100	100	100
8	Mechanical life	Times	10000
9	Rated duration of short circuit	s	4
10	Rated operating sequence		O-0.3s-CO-180s-CO
10	Rated operating sequence		O-180s-CO-180s-CO(40kA以上）
11	Rated short circuit breaking times	Times	30
12*	Rated single capacitor bank breaking current	A	400
13*	Rated back to back capacitor bank breaking current	A	400
14	Clearance between open contacts	mm	11 ± 1
15	Over-travel of contact	mm	4 ± 1
16	Opening &closing simultaneity of 3 phase contact	ms	≤ 2
17	Bounce time of contact closed	ms	≤ 2
18	Closing time	ms	50~100
19	Opening time	ms	20~60
20	Average closing speed	ms	0.6 ± 0.2
21	Average opening speed	m/s	1.1 ± 0.2
22	Max DC component		50%

4.Overall drawing

Overall and assembled dimensions of 2000-31.5&under

Overall and assembled dimensions of 2500-31.5（40kA)

5.Secondary connection diagram

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