outdoor vacuum circuit breaker--ZW32-12

When the circuit breaker receives a tripping signal, the operating mechanism acts, causing the moving contact to move from the closed position to the open position. At the moment when the moving and fixed contacts separate, an arc is generated due to the increase in the contact resistance between the contacts.

The vacuum environment in the vacuum interrupter enables the arc to be quickly extinguished when the current crosses zero, thus achieving the disconnection of the circuit.

During the closing process, the operating mechanism makes the moving contact move towards the fixed contact until they come into contact and complete the closing operation, thereby connecting the circuit.

Product Detail

working principle

The vacuum environment in the vacuum interrupter enables the arc to be quickly extinguished when the current crosses zero, thus achieving the disconnection of the circuit.

Product Features

Strong arc extinguishing ability: It adopts a vacuum interrupter, with vacuum as the arc extinguishing and insulating medium. It can quickly extinguish the arc, and the breaking performance is stable.
High reliability: The permanent magnet operating mechanism is provided with a holding force by a permanent magnet. With fewer mechanical parts and a short transmission chain, it improves the reliability and mechanical life of the switch.
Good insulation performance: It adopts a post-type fully enclosed solid insulation structure or the technology of completely encapsulating the main body. It has good sealing performance and can adapt to harsh environments.
Easy operation: It can be operated manually or electrically, and can also be remotely controlled. It can also cooperate with a controller to achieve the "four remote" functions (remote measurement, remote control, remote signaling, and remote regulation).
Small in size and light in weight: With a compact structure, it is convenient for installation and transportation.
Low maintenance cost: It has a long mechanical life. There is no need for maintenance or adjustment within 30,000 operations, featuring maintenance-free characteristics.

Product Parameters

Rated voltage: 12kV.
Rated insulation level: 1-minute power-frequency withstand voltage, 42kV between poles and to the ground, 48kV across the open contacts; rated lightning impulse withstand voltage, 75kV between poles and to the ground, 85kV across the open contacts.
Rated current: 630A.
Rated short-circuit breaking current: 20kA.
Rated short-circuit making current (peak value): 50kA.
Rated number of short-circuit breaking operations: 30 times.
Rated thermal stability time: 4s.
Mechanical life: 30,000 times.
Rated operating voltage of the auxiliary circuit: 220V.
Rated operating sequence: Trip - 0.3s - Close and trip - 180s - Close and trip.
Contact opening distance: 9 ± 1mm.
Contact overtravel: 2 ± 0.5mm.
Three-phase closing and tripping synchronism: ≤ 2ms.
Closing contact bounce time: ≤ 2ms.
Closing contact pressure: 2000N.
Average tripping speed: 1 ± 0.2m/s.
Average closing speed: 0.6 ± 0.2m/s.
Tripping time: ≤ 50ms.
Closing time: ≤ 75ms.
Resistance of each phase main circuit: ≤ 80μΩ.
Allowable wear thickness of moving and fixed contacts: ≤ 3mm