
Unwavering in our dedication to customers and delivering cutting-edge innovations,Bepto stands as your steadfast ally on the journey ahead.
ZW8-12 Outdoor AC High Voltage Vacuum Circuit Breaker: 12kV three-phase common box VCB, vacuum arc extinguishing, electric spring mechanism, ceramic shell, silicone rubber injection, pollution resistant, -40°C to +40°C, pollution level III.
Advanced ZW8-12 Outdoor Vacuum Circuit Breaker Series: Outdoor AC high voltage vacuum circuit breaker rated 12kV using vacuum arc extinguishing chamber, air insulation and electric spring operating mechanism, strong arc extinguishing ability with many short-circuit opening times, no fire and explosion hazard with easy operation delivering excellent performance and practical product, three-phase common box type overall structure with inlet/outlet casings, dry air inside box, electric spring operating mechanism arranged on side of box enabling reliable use under harsh environmental conditions, vacuum arc extinguishing chamber adopts ceramic shell, cup-shaped longitudinal magnetic field contact structure and copper-chromium contact materials providing excellent breaking and closing short-circuit current capabilities.
Compact Design and Pollution Resistant Features: ZW8-12 incorporates small size, light weight and beautiful appearance design, vacuum arc extinguisher and insulating support sleeve compact in design, outlet conductive rod injected with silicone rubber adapting to harsh climate conditions and dirty environments, operates reliably in -40°C to +40°C ambient temperature, altitude ≤2000m, surrounding air may be contaminated by dust/smoke/corrosive gases/steam/salt spray, wind speed ≤34m/s (700Pa), pollution level III, vibration or ground motion from switchgear/control equipment negligible, providing reliable three-phase common box vacuum circuit breaking solution for 12kV outdoor applications in harsh and polluted environments.

| ZW8-12 Outdoor AC High Voltage Vacuum Circuit Breaker Specifications | Parameter | Unit |
|---|---|---|
| Brand | Bepto Insulation Systems | – |
| Model Number | ZW8-12 | – |
| Product Type | Outdoor AC High Voltage Vacuum Circuit Breaker (12kV Three-Phase Common Box VCB) with Electric Spring Mechanism for Pollution Resistant Applications | – |
| Core Technology | Vacuum Arc Extinguishing Chamber + Air Insulation + Electric Spring Operating Mechanism + Three-Phase Common Box Type Structure + Dry Air Inside Box + Ceramic Shell Vacuum Arc Extinguishing Chamber + Cup-Shaped Longitudinal Magnetic Field Contact Structure + Copper-Chromium Contact Materials + Silicone Rubber Injection + Compact Design + Insulating Support Sleeve + Pollution Resistant | – |
| Rated Voltage | 12 | kV |
| Installation Type | Outdoor | – |
| Current Type | AC (Alternating Current) | – |
| Phases | Three-Phase | – |
| Vacuum Arc Extinguishing Chamber | Yes (Vacuum Arc Extinguishing Chamber) | – |
| Air Insulation | Yes (Air Insulation) | – |
| Electric Spring Operating Mechanism | Yes (Electric Spring Operating Mechanism) | – |
| Strong Arc Extinguishing Ability | Yes (Strong Arc Extinguishing Ability) | – |
| Many Short-Circuit Opening Times | Yes (Many Short-Circuit Opening Times) | – |
| No Fire and Explosion Hazard | Yes (No Fire and Explosion Hazard) | – |
| Easy Operation | Yes (Easy to Operate) | – |
| Excellent Performance | Yes (Excellent Performance and Practical Product) | – |
| Three-Phase Common Box Type | Yes (Three-Phase Common Box Type Overall Structure) | – |
| Inlet/Outlet Casings | Yes (Casings In and Out) | – |
| Dry Air Inside Box | Yes (Dry Air Inside the Box) | – |
| Side-Mounted Mechanism | Yes (Electric Spring Operating Mechanism Arranged on Side of Box) | – |
| Harsh Environmental Conditions | Yes (Reliable Use Under Harsh Environmental Conditions) | – |
| Ceramic Shell | Yes (Vacuum Arc Extinguishing Chamber Adopts Ceramic Shell) | – |
| Cup-Shaped Longitudinal Magnetic Field Contact | Yes (Cup-Shaped Longitudinal Magnetic Field Contact Structure) | – |
| Copper-Chromium Contact Materials | Yes (Copper-Chromium Contact Materials) | – |
| Excellent Breaking Capability | Yes (Excellent Breaking Short-Circuit Current Capability) | – |
| Excellent Closing Capability | Yes (Excellent Closing Short-Circuit Current Capability) | – |
| Small Size | Yes (Small in Size) | – |
| Light Weight | Yes (Light in Weight) | – |
| Beautiful Appearance | Yes (Beautiful in Appearance) | – |
| Compact Design | Yes (Vacuum Arc Extinguisher and Insulating Support Sleeve Compact in Design) | – |
| Silicone Rubber Injection | Yes (Outlet Conductive Rod Injected with Silicone Rubber) | – |
| Harsh Climate Conditions | Yes (Can Adapt to Harsh Climate Conditions) | – |
| Dirty Environments | Yes (Can Adapt to Dirty Environments) | – |
| Pollution Resistant | Yes (Pollution Resistant Design) | – |
| Ambient Air Temperature | -40°C to +40°C | °C |
| Altitude | ≤2000 | m |
| Air Contamination | Yes (Surrounding Air May Be Contaminated by Dust, Smoke, Corrosive Gases, Steam or Salt Spray) | – |
| Wind Speed | ≤34 (equivalent to 700Pa on cylinder surface) | m/s |
| Vibration or Ground Motion | Negligible (Vibration or Ground Motion from Switchgear and Control Equipment Can Be Ignored) | – |
| Pollution Level | Level III | – |
| Key Advantages | Three-Phase Common Box, Vacuum Arc Extinguishing, Electric Spring Mechanism, Ceramic Shell, Cup-Shaped Longitudinal Magnetic Field Contact, Copper-Chromium Contacts, Silicone Rubber Injection, Compact Design, Light Weight, Pollution Resistant, Harsh Climate Adaptation, No Fire/Explosion Hazard, Easy Operation, Wide Temperature Range | – |
| Primary Applications | 12kV Outdoor AC High Voltage Applications, Harsh Environmental Conditions, Dirty Environments, Dust/Smoke/Corrosive Gases/Steam/Salt Spray Contamination, Three-Phase AC Systems, Pollution Level III Environments, Short-Circuit Current Breaking/Closing | – |
Bepto is a leading Chinese company in electrical insulation, focused on developing advanced solutions for future power systems. We support transmission and distribution safety and growth, with long-term partners including State Grid, ABB, Schneider, Siemens, and GE. Our services reach clients in over 22 countries.

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Bepto focuses on the global market and provides our clients with products suitable for the local market:
Unwavering in our dedication to customers and delivering cutting-edge innovations,Bepto stands as your steadfast ally on the journey ahead.