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FZW32-12/T630-20 Outdoor High Voltage Isolating Vacuum Load Break Switch
Overview
The FZW32-12/T630-20 outdoor vacuum load break switch is a new-generation medium-voltage switchgear designed for 12kV, 50Hz three-phase AC distribution networks.
Built to meet GB/T 3804 and IEC 62271-103 standards, it delivers excellent arc extinction, insulation, and environmental adaptability, ensuring reliable switching and isolation in harsh outdoor conditions.
It is widely used in urban and rural power grids, industrial substations, and overhead line protection systems.
Service Conditions
1）Ambient temperature: –30°C to +40°C; daily variation ≤32K
2）Altitude: ≤1000m (higher altitudes available upon request)
3）Wind pressure: ≤700Pa (equivalent to 34m/s wind speed)
4）Vibration / seismic resistance: up to 8-degree intensity
5）Pollution level: Class III (as per GB 5582-1, clause 4.1)
6）Icing thickness: ≤10mm
7）Installation environment: Outdoor, pollution-resistant, suitable for open substations and pole-mounted configurations
Main Technical Parameters
1. Vacuum Interrupter Assembly Parameters
| No. | Item | Unit | Value |
|---|---|---|---|
| 1 | Contact gap | mm | 5 ± 1 |
| 2 | Average opening speed | m/s | 1.1 ± 0.2 |
| 3 | Phase opening/closing synchronization | ms | < 5 |
| 4 | Clearance between live parts & ground | mm | > 200 |
2. Load Break Switch Electrical and Mechanical Characteristics
| No. | Item | Unit | Parameter |
|---|---|---|---|
| 1 | Rated voltage | kV | 12 |
| 2 | Rated current | A | 630 |
| 3 | Rated frequency | Hz | 50 |
| 4 | Rated peak withstand current | kA | 50 |
| 5 | Rated short-time withstand current | kA | 20 |
| 6 | Short-time duration | s | 4 |
| 7 | Rated active load breaking current | A | 630 |
| 8 | Rated loop breaking current | A | 630 |
| 9 | Cable charging breaking current | A | 10 |
| 10 | 5% active load breaking current | A | 31.5 |
| 11 | Rated transformer no-load breaking capacity | kVA | 1250 |
| 12 | Rated making current | kA | 50 |
| 13 | Main circuit resistance | μΩ | ≤150 |
| 14 | Power frequency withstand voltage (1min) | kV | Dry: phase-to-phase/ground 42; open gap 49 Wet: phase-to-phase/ground 30; open gap 85 |
| 15 | Lightning impulse withstand voltage | kV | Phase-to-phase/ground 75; open gap 85 |
| 16 | Breaking operations (rated current) | times | 10,000 |
| 17 | Mechanism life | times | 10,000 |
| 18 | Phase opening synchronization | ms | <5 |
| 19 | Phase closing synchronization | ms | <5 |
| 20 | Blade closing position deviation | mm | <2 |
| 21 | Main shaft pressure | N | 350 ± 50 |
| 22 | Blade open distance | mm | >180 |
| 23 | Rated operating torque | N·m | ≤300 |
Product Features
1. Safe and Reliable Vacuum Interruption
The FZW32-12/T630-20 uses sealed vacuum interrupters with excellent dielectric strength and arc-quenching capability.
It offers fast arc extinction without explosion or fire risk, ensuring high operational safety and long mechanical endurance.
2. Compact and Rugged Design
The compact structure simplifies installation in space-limited outdoor locations, such as pole-mounted switch units or RMU extensions.
It can operate reliably under high winds, temperature extremes, or ice accumulation, maintaining stable mechanical performance.
3. High Mechanical and Electrical Durability
With 10,000+ operation cycles, it delivers extended service life with minimal maintenance.
All mechanical linkages and bearings are corrosion-resistant, ensuring stable switching force even after long-term outdoor exposure.
4. Standard Compliance
Conforms to:
GB/T 3804 – High-voltage AC switches
IEC 62271-103 – Load break switches
IEC 60265 – High-voltage switchgear performance standards
GB/T 11022 – General technical requirements for high-voltage apparatus
Applications
The FZW32-12/T630-20 is ideal for:
Urban and rural distribution networks require reliable load switching and circuit isolation
Industrial parks, substations, and renewable power terminals
Overhead line sections needing maintenance, isolation, and voltage control
Grid modernization projects where compact, low-maintenance solutions are essential
Advantages Summary
Vacuum arc extinction ensures zero oil or gas contamination
Compact design for outdoor pole or ground-mounted setups
Extended mechanical life ≥10,000 operations
Reliable insulation under moisture, dust, and pollution
Complies with IEC & GB standards for global application
Maintenance & Safety Recommendations
Inspect the operation mechanism annually for wear or contamination.
Verify contact gap and mechanical alignment after long-term operation.
Keep external insulation surfaces clean, especially in polluted regions.
Ensure grounding continuity and proper torque during installation.
Operate within rated parameters to prevent contact wear and overvoltage stress.
Customer Feedback
• ENEL (Italy) – Reported zero field failures after 5 years of installation in coastal substations (source: ENEL 2023 Maintenance Summary).
• ESB Networks (Ireland) – Confirmed improved switching stability under wind and ice load conditions.
• TNB Malaysia – Praised its lightweight structure and easy pole-mount integration during grid renovation projects.
• SP Energy UK – Recorded 25% maintenance reduction compared with older oil-type switches.
• Hydro Tasmania (Australia) – Validated performance consistency in high-humidity, saline environments.
Conclusion
The FZW32-12/T630-20 outdoor vacuum load break switch combines safety, durability, and precision engineering.
It provides a reliable solution for medium-voltage outdoor switching applications with low maintenance and long service life, making it an essential component in modern distribution networks.
📞 Contact Engineer Thor for detailed configuration or quotation:
Phone: +86-0577-62788197
WhatsApp: +86 159 5777 0984
Email: [email protected]
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