ZW8-12/F(G)630-20 Outdoor High Voltage AC Vacuum Circuit Breaker

A compact, pole-mounted solution for 12kV outdoor networks, engineered for reliable performance in all weather conditions.

The ZW8-12F(G)-630/20 is an outdoor high-voltage vacuum circuit breaker specifically designed for overhead 12kV distribution systems, especially in rural grids, mining operations, and remote substations. It provides fast, arc-free interruption of fault currents and supports automatic reclosing when paired with intelligent controllers.

This model features a fully sealed stainless steel enclosure, ensuring consistent performance in challenging weather conditions like snow, rain, dust, and high humidity.

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Technical Specifications

Parameter	Specification
Model	ZW8-12F(G)-630/20
Rated Voltage	12kV
Rated Current	630A
Rated Short-Circuit Breaking Current	20kA
Rated Frequency	50Hz
Lightning Impulse Withstand	75kV
Power Frequency Withstand	42kV
Mechanical Life	10,000 operations
Closing/Open Time	≤ 100ms
Operating Mechanism	Spring or Permanent Magnetic Actuator
Protection Grade	IP65 (Fully Sealed Tank)
Standard Compliance	GB 1984, IEC 62271-100

Key Advantages

Why choose our ZW8-12 circuit breaker?

• Stainless Steel Sealed Tank: Effectively prevents condensation, dust, and corrosion, ensuring long-term operation in harsh outdoor environments and significantly reducing maintenance costs.

• Remote Operation Compatible: Seamlessly integrates with RTUs, SCADA, and automatic recloser systems to help you easily upgrade to a smart grid, enabling remote monitoring and control.

• Arc-Free Interruption: Vacuum interrupter technology ensures safe, rapid disconnection, eliminating fire or explosion hazards.

• Modular Design for Easy Maintenance: The control and drive modules are separate, allowing for faster field servicing and minimizing downtime.

• Customizable Control Schemes: Offers manual, motorized, or intelligent control units, providing flexible configuration based on your project needs and preparing you for future expansion.

Case Study

• Client Challenge: How to quickly identify and resolve faults in a large, climate-variable mountainous grid to reduce outage time.

• Solution: We supplied 50 ZW8-12F(G) breakers for the project, which integrated seamlessly with the client's FTU controllers.

• Results: Successfully reduced the average line fault recovery time from hours to just minutes, significantly improving power supply reliability.

Application Scenarios

• High-voltage overhead distribution lines for rural and urban grids

• Incoming feeders for wind and solar farms

• Pole-mounted recloser setups and section switches

• Outdoor substations for mining and industrial use

• Temporary emergency switching points in disaster zones

What Our Global Users Say

🔹 Carlos M., Distribution Supervisor – Eletropaulo, Brazil "We installed ZW8-12 breakers on 20 poles in the Amazon outskirts. Flawless operation during rainy seasons." 

🔹 Anna B., Grid Engineer – Enedis, France "It performed better than expected with remote closing functions during storm faults." 

🔹 Dave S., Utility Technician – Western Power, Australia "Best cost-performance ratio for remote substations. It just works." 

🔹 John K., EPC Contractor – Kenya Power "Highly durable housing. The built-in current transformers make site wiring more efficient." 

🔹 Marissa T., Project Manager – Pacific Light, Philippines "We paired it with an FTU controller and reduced line outages significantly. Highly recommended for developing grids."

Frequently Asked Questions

• Is the ZW8-12F(G) suitable for automated recloser applications?

• Yes. It supports FTU/DTU integration and SCADA-based remote commands.

• What’s the main difference between ZW8-12F and ZW32 models?

• The ZW8-12F uses a sealed tank structure and is more compact, while the ZW32 has external bushings and is better suited for higher breaking currents.

• Can it operate in snowy or desert areas?

• Yes. With IP65 protection and a sealed tank, it’s suitable for all climates.

• Is the installation complex?

• No. The pole-mounted setup is quick with a hot-dip galvanized base and plug-in connectors.

• Are there type test reports available?

• Yes, including breaking capacity, insulation, mechanical endurance, and IEC 62271-100 certification.

Get a Custom Quotation or Technical Support

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Thor – Electrical Engineer, Wei Shoe Elec 

📞 Tel: +86-0577-62788197 

📱 WhatsApp: +86 159 5777 0984 Contact us today to receive product data sheets or to discuss integration support for your smart grid platform with our engineers.