Overview
It adopts a vacuum interrupter, air insulation, and is equipped with an electric spring operating mechanism, which gives the product strong arc-extinguishing capability, high short-circuit breaking frequency, no fire or explosion hazard, and convenient operation. It is a product with excellent performance and strong practicality.
The overall structure of this product adopts a three-phase common tank type, with bushing incoming and outgoing lines. The tank is filled with dry air. The electric spring operating mechanism is arranged on the side of the tank, enabling reliable use under harsh environmental conditions.
The vacuum interrupter of this product adopts a ceramic enclosure, cup-shaped axial magnetic field contact structure, and copper-chromium contact material, providing excellent capability for breaking and making short-circuit currents.
This product is small in size, light in weight, and aesthetically pleasing in appearance. The vacuum interrupter and insulating support bushing are compactly designed; the outgoing conductive rod is externally coated with silicone rubber, enabling adaptation to harsh climatic conditions and polluted environments.
The ZW8-12/630-20 outdoor high voltage vacuum circuit breaker is used in AC 50Hz three-phase power systems, mainly for breaking and making load current, no-load current, and short-circuit current of 10kV urban power grids. It can also serve as a branch switch for rural power grids and small power systems. It is an oil-free upgrade and replacement product for urban and rural power grids.
Main Technical Parameters
| Rated voltage | 12kV |
| Rated current | 630A |
| Power frequency withstand voltage | 42kV/48kV |
| Lightning impulse withstand voltage (peak) | 75kV/85kV |
| Rated short-circuit breaking current (RMS) | 20kA |
| Rated short-circuit making current (peak) | 50kA |
| Rated operating sequence | Open-0.3S Close-Open-180S Close-Open |
| Rated short-circuit current breaking frequency | 30 times |
| Mechanical life | 10000 times |
| Rated operating voltage (closing/opening coil) | DC220V AC220V |
| Allowable wear thickness of moving and fixed contacts | 3mm |
| Isolating gap breaking distance | >200mm |
