ZW32-12kV Outdoor Pole-Mounted Vacuum Circuit Breaker

  • Vacuum Interrupter:Miniaturized vacuum chamber with ceramic shell and copper-chromium contacts, stable breaking, minimal wear, no burning or explosion risk
  • Three-Phase Separated Structure:Prevents three-phase short circuits during single-phase faults
  • Insulation Sleeve:Silicone rubber sealed, maintenance-free for 20 years, prevents condensation faults
  • Outdoor Insulation:Epoxy or silicone rubber material with excellent hydrophobicity and pollution resistance
  • Operating Mechanism:Permanent magnet or spring type with over 10,000 mechanical operations
  • Fully Sealed Box:Oil-free, rust-proof, moisture-resistant, environmentally friendly design
  • Isolation Switch:Visible isolation, mechanical interlock prevents misoperation, manual operation mode
Describe Display

ZW32-12kV outdoor pole-mounted vacuum circuit breaker is a three-phase AC 50Hz/60Hz primary switching device rated for 12kV. It is designed to break and close load, overload, and short-circuit currents, mainly used in power distribution networks of substations, industrial and mining enterprises, and rural grids with frequent operations.

 

Equipped with advanced vacuum interrupters and integrated isolation switch, it offers reliable fault isolation and protection. The product can be paired with controllers to support distribution automation and traditional recloser functions.

Product parameters
Rated Technical Parameters of Vacuum Circuit Breaker

 

No. Items Unit Value
Rated voltage kV 12
Rated current A 630, 1250
Rated frequency Hz 50/60
Rated short-circuit breaking current kA 20, 25
Rated peak withstand current 50, 63
Rated short-time withstand current (4s) 20, 25
Rated short-circuit making current (Peak) 50, 63
Number of Mechanical Operations Time 10000
Rated operating sequence   O-0.3s-CO-180s-CO
10  Rated power-frequency withstand voltage (1min):
Between phases and Phase to earth
kV 42
10  Rated power-frequency withstand voltage (1min):
Across the isolating distance.
48
11  Rated lightning impulse withstand voltage (Peak):
Between phases and Phase to earth
kV 75
11  Rated lightning impulse withstand voltage (Peak):
Across the isolating distance.
85
12  1 min power frequency withstand voltage of secondary circuit kV 2
13  Net Weight kg 85

 

 

Mechanical Properties Parameters of vacuum circuit Breaker

 

No. Items Unit Value
1 Contact spacing mm 8~10
2 Contact overtravel 2~3
3 Average closing speed m/s 0.75±0.2
4 Average opening speed 1.25±0.2
5 Contact closing bounce time ms ≤2
6 Three-phase opening Simultaneous time difference ≤2
7 Closing time ≤60
8 Breaking time 20~60
9 Each phase circuit resistance μO ≤80
10 Conductive loop resistance per phase
(With disconnecting switch)
<200
11 Distance between phases outside the box mm 340±3
12 Allowable cumulative wear thickness
of dynamic and static contacts
3

 

 

Technical Parameters of Motor and Opening-Closing Coil

 

Items Rated operating voltage(V) Rated power Rated operating current (A) Normal working range
Motor -200 40 0.5 85%-110% rated operating voltage
-110  
-48 1.8
-24 4.6
Opening and
Closing Coil
-220 372 1.69 Opening: 65%-120% rated operating voltage,
30% rated Voltage should not trip.
-110 374 3.4
-48 480 10
-24 276 11.5
Size/Installation

Features

The breaker adopts a three-phase separated column design with each phase installed in its own insulating sleeve. The vacuum interrupter uses a ceramic shell and copper-chromium contacts with a longitudinal magnetic field arc extinguishing method for reliable breaking. The vacuum chamber is sealed in a silicone rubber sleeve, ensuring 20 years of maintenance-free operation. The insulating cylinders are made of outdoor epoxy or silicone rubber, offering strong hydrophobicity and pollution resistance. The operating mechanism can be permanent magnet or spring type, installed in a fully sealed box for moisture and rust protection. External current transformers and composite controllers with anti-inrush functions are installed on phases A and C. An isolation switch with mechanical interlock is included to prevent misoperation.

Related Notes

The circuit breaker operates reliably in ambient temperatures from -40°C to +40°C, at altitudes up to 2000 meters, and under wind pressures up to 700Pa. It withstands pollution level IV and earthquakes up to 8 degrees. Regular maintenance includes inspection every 5 years, cleaning insulating parts, greasing moving parts, checking fasteners, and performing electrical tests. The breaker should be cycled several times annually if rarely operated. Safety precautions must be observed during maintenance due to stored mechanical energy in the operating mechanism. Customization is available upon request.

 

 

Customized Solutions

 

The parameters listed above are standard references. If these styles do not fulfill your specific requirements, feel free to reach out to us for a bespoke design. With strong capabilities in personalized development and production, we offer tailored solutions to clients worldwide.

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Our certification team consists of 85+ engineers with more than 20 years of professional experience
24/7 Service. Average emergency response time is limited to less than 12 hours
Suitable for substations, industrial power grids, new energy projects and other demanding scenarios
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