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ZN12-40.5(3AF)
Indoor High Voltage Vacuum Circuit Breaker
1.General Description
ZN12-40.5 series of indoor HV vacuum circuit breaker is with rated voltage of 40.5kV.three-phase AC 50 (60) Hz indoor HV switch equipment.The structure of this kind of circuit breaker is simple but with strong breaking capability:it is suitable
for application in the mining industry,substations and power transmission and distribution systems for controlling and protecting the switch. Especially suitable for the industry which requires frequently operations like metallurgy fietds,electric
arc steel plant to control and protect the equipment.This kind of vacuum circuit breaker can be assembled with truck which can be suitable for many kinds of switchgears such as JYNI.GBC etc
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. Structural characteristics:
1.The operating mechanism is introduced the technique of operating mechanism from Siemens 3AF vacuum circuit breaker. the operating mechanism is integrated with vacuum circuit breaker,with characteristics of short transmission routes,less chains and high transmission efficiency.
2.This operating mechanism adopts spring type.It can be operated by AC or DC.also can be operated by manual.
4. Technical specification
No. | Item | Unit | Data | |||
1 | Rated voltage | kV | 40.5 | |||
2 | Rated frequency | Hz | 50/60 | |||
3 | Rated power frequency withstand voltage/1min | kV | 95 | |||
4 | Rated lighting impulse withstand voltage | kV | 185 | |||
5 | Rated current | A | 630 | 1250 | 1600 | 2000 |
6 | Rated short circuit breaking current | kA | 25 | 25 | ||
Rated short time withstand current(4s) | 31.5 | 31.5 | 31.5 | |||
7 | Rated short circuit making current(peak) Rated withstand current(peak) | kA | 63 | 63 | ||
80 | 80 | 80 | ||||
8 | Mechanical life | Times | 10000 | |||
9 | Rated duration of short circuit | s | 4 | |||
10 | Rated operating sequence | O-0.3s-CO-180s-CO | ||||
11 | Rated short circuit breaking times | Times | 20 | |||
12* | Rated single capacitor bank breaking current | A | 400 | |||
13* | Rated back to back capacitor bank breaking current | A | 400 | |||
14 | Supply voltage of opening&closing circuit | V | AC/DC 220/110 | |||
15 | Rated current of closing coil | A | DC220(0.89);DC110(1.91) | |||
16 | Rated current of opening coil | A | DC220(1.25);DC110(1.91) | |||
17 | Clearance between open contacts | mm | 22 ± 2 | |||
18 | Over-travel of contact | mm | 6 ± 2 | |||
19 | Opening &closing simultaneity of 3 phase contact | ms | ≤ 2 | |||
20 | Bounce time of contact closed | ms | ≤ 3 | |||
21 | Closing time | ms | ≤ 100 | |||
22 | Opening time | ms | ≤ 50 | |||
23 | Average closing speed | ms | 0.75 ~1.25 | |||
24 | Average opening speed | m/s | 1.15~1.85 | |||
25 | Max DC component | 40% | ||||
5.Overall drawing
ZN12-40.5 fixed
ZN12-40.5 handcart
6.Secondary connection diagram
Connection diagram of ZN12-40.5 fixed type
Connection diagram of ZN12-40.5 handcart type
Circuit breaker series 
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