PRODUCT SHOW

ZN28-12 series vacuum circult breaker

ZN28-12 series vacuum circuit breaker is a kind of indoor high-volt swithch equipment of rated volt 12KV,AC three-phase 50Hz. The structure of that can be divided into two kinds:switchgear and operating mechanism mounted unifiedly,switchgear and operating mechanism mounted separately.Unified structure is ZN28-12 basic style;sepate structure is ZN 28a-12 style,which is available in various fixed swirchgear cubicle,as G1A(Z),XGN 2A10(Z)and so on. This product can beapplied withCD17,CD10A type DC electromagnetic operating mechanism and CT17^CT19 type spring charging operating mechanism.
principle Technical Parameter

NO. Designation Unit Data
20kA 25kA 31.5kA 40kA
1 Rated Volt(KV) KV  
2 Rated Current(KA) A 630,1000 1250,1600 1250,1000 1600,1250
1250   2000,2500 3150
3 Rated short circuit breaking current kA 20 25 31.5 40
4 Rated short circuit opening & closing current(summit) kA 50 63 80 100
5 Rated summit withstand current kA 50 63 80 100
6 4S rated short circuit withstand current kA 20 25 31.5 40
7 Rated insulating level Industrial-frequency withstand voltage(Rated breaking around) KV Frature 48
Industrial withstand voltage(Rated breaking around) Frature 48
8 Rated operating seguence Open-0.3s-close&open-180s&open
9 Machanism Life Time 1000
10 Rated short circuit breaking current & times Time 30 20
11 Rated closing volt(DC)of operating mechanism V 110,220 220
12 Rated closing current(DC)of operating mechanism A 71 128
13 Rated opening volt(DC)of operating mechanism V 3.0,1.5
14 Rated opening current(DC)of operating mechanism A 110,220
15 Contactoe Distance mm 11±1
16 Extra-Stroke(contactoe spring length) mm 4±1
17 Un-meaning property of three-phase opening,closing brake ms ≤2
18 Sprang time of contactor closed ms ≤2
19 Average opening brake(6mm height) m/s 1.2±0.3
20 Average opening speed m/s 0.6±0.2
21 Opening time Under max opening volt s ≤0.08
Under min opening volt ≤0.06
22 Closing time s ≤0.02
23 Main circuit resistance if each phase μ Ω ≤40 ≤0.02
24 Permitted wear thickness of movable and stationary contactor mm 3
25 Buffering strokr of oil butter mm 10