SOJO Electric Co., Ltd.
Add.: Room 1111, Block D, Jiahua Plaza, Shangdi 3rd Street, Haidian District, Beijing
Tel.: +86-010-62983386
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Home » Products » Pole Mounted Switch » ZW8 Outdoor Pole Mounted Circuit Breaker

Outdoor Pole Mounted Circuit Breaker

The ZW8-12 outdoor pole mounted circuit breaker is for AC three phase power system (50 Hz, 12 KV). It can break and make the load current, overload current and short circuit fault circuit, making itself a controller and protector for the power network. When the breaker is combined with the insulated switch, it can also used as a section switch.

Our ZW8-12 outdoor pole mounted circuit breaker comes with two types of operating method, namely motor-driven operating method (represented by D) and manual operating method (represented by S).

Model name and its meaning

1. Disconnector
2. Rated short-circuit breaking current (kA)
3. Rated current (A)
4. Spring operating mechanism
5. Rated voltage (kV)
6. Design series
7. Outdoor type
8. Vacuum circuit breaker

Working environment
Ambient temperature: -45℃~+45℃
Wind speed: ≤ 35m/s
Altitude: ≤ 3000 m
Seismic capacity: VIII grade (seismic intensity)
Pollution class: Class IV according to GB/T5582-1993

Table 1 The main parameters of the circuit breaker
NO. Item Unit Data
1 Rated voltage kV 12
2 Rated insulating level power frequency withstand voltage (1min) Dry, phase to phase, phase to earth, across open contacts kV 42/48
Wet kV 34
  Lightning impulse peak withstand voltage Phase to phase, phase to earth, across open contacts kV 75/85
3 Rated current A 630 ,1250
4 Rated short-circuit breaking current kA 20
5 Rated operating sequence   Opening-0.3s-closing opening-180s-closing opening
6 Rated short circuit breaking current times Time 30
7 Rated peak short-circuit making current kA 50
8 Rated peak withstand current kA 50
9 Rated short time sustained current kA 20
10 Rated short time duration S 4
The shape and installation dimension of the circuit breaker
The chart of the circuit breaker’s dimension

1. Knife
2. Contact
3. Insulated pull rod
4. Brace
5. Disconnector operating handle

6. Spindle
7. Disconnector support
8. Circuit breaker
9. Open
10. Close

The circuit breaker should be installed 4 m above the ground on a pole. Installation dimension chart

1. Open
2. Close

3. Spring Charged
4. Spring Discharged

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