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ZW32-12 Outdoor high voltage vacuum circuit breaker (watchdog switch) is an outdoor high-voltage power distribution switchgear device with rated voltage of 12KV and three-phase AC of 50 Hz. The circuit breaker is mainly used for breaking and closing the load current. The circuit breaker is mainly used for breaking and closing the load current and overload current in the power system. Short-circuit. quick-break. grounding profection, optional reclosing times, local remote control and remote communication functions. suitable for protection and control in substation and industrial and mining enterprises’ distribution systems.When the internal fault of the T-type wiring of the 12Ky line occurs. or although it occurs inside the user’s incoming line switch, but the protection action time limit and the substation outlet switch protection are not proper, the substation outlet switch protection will be opened. If the fault is permanent and the substation coincides unsuccessfully, an accident in the medium voltage user community will power down the entire distribution trunk. Such common incidents in the power grid will cause significant losses to society. ZW32-12 outdoor high voltage vacuum circuit breaker (watchdog switch) (hereinafter called circuit breaker is installed in the responsibility boundary of the overhead line, that is the front section of the user incoming line. The single-phase ground fault and the phase-to-phase short-circuit fault in the user will be automatically cut off to avoid the fault in the user boundary and the power transmission trunk and ensure the safety of power users of faulty users and improve the reliability of power consumption.

 Model Meaning








Vacuum Circuit Breaker


Design number

Rated voltage (KV)

Spring operating mechanism

Working Condition

●Ambient air temperature: Max.+40℃,Min.-40℃。
●Altitude: ≤2000m.
●Wind speed:Not more than 34m/s (Equivalent to 700 Paona cylindrical surface).
●Pollution level: Ⅳ.
●No frequent violent vibration, the seismic intensity does not exceed 8 degrees.
●The place should be no fire,explosion hazard, chemical corrosion.

Technical specification

No. Ltem Unit Data
1 Rated voltage KV 12
2 Rated frequency Hz 50
3 Rated current A 630
4 Rated short circuit breaking current KA 20
5 Rated peak withstand current KA 50
6 Rated short-circuit withstand current KA 20
7 Rated short circuit closing current(peak) KA 50
8 Mechanical life Times 10000
9 Rated short-circuil breaking current breaking times Times 30
10 Power frequency withstand voltage (1 min): (wet) (dry) phase to phase, to earth/Between open contacts KV 42/48
11 Lightning impulse withstand voltage (peak) phase Io phase、to earth/ Between open contacts KV 75/85
12 Secondary circuit Imin power frequency withstand voltage KV 2

Outline overall and installing dimensions

 ZW32-12F Outdoor high voltage vacuum circuit breaker 001

1. Operation handle 8. Insulator
2. Isolate the spindle 9. The isolation
3. Manual split and close handle of circuit breaker 10. Insulation pull rod
4. Circuit breaker energy storage handle 11. Wiring board (incoming end)
5. Divide and combine instructions 12. Isolate the blade
6. Wiring plug 13.Wiring board (outgoing end)
7.Current transformer 14. The circuit breaker

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