ZW7-40.5 outdoor High Voltage vacuum circuit breaker is used for AC three-phase power system with 50Hz and voltage of 40.5KV, which is used for breaking, closing load current, overload current and short circuit current.
1. Vacuum arc extinguishing, strong breaking capacity, long electrical life and 10,000 mechanical life;
2. Simple structure, maintenance-free, long maintenance period;
3. Good insulation performance and strong anti-pollution ability;
4. It can be equipped with spring or electromagnetic operating mechanism, with reliable mechanical performance and frequent operation; no fire and explosion hazard;
5. Built-in current transformer, the lecturer’s precision reaches 0.2, which can realize three-phase interactive protection;
6. With condensation controller, it can keep the circuit breaker running reliably under certain temperature and humidity.
1. Ambient air temperature: upper limit +50 ° C, lower limit -30 ° C;
2. Altitude: ≤3000m (If the altitude is to be increased, the rated insulation level will increase accordingly);
3. Wind pressure: no more than 700Pa (equivalent to a wind speed of 34m / s;
4. Amplitude: seismic intensity of 8 degrees;
5. Pollution level: Level III;
6. Large daily temperature difference: no more than 35 °C.
NO Item Unit Value 1 Rated voltage KV 40.5 2 Rated insulation level Power frequency withstand voltage Dry test 95 Wet test 80 Lightning impulse withstand voltage (peak) 185 3 Rated current A 1250,1600,2000 4 Rated short-circuit breaking current KA 20,25,31.5 5 Rated operation sequence 0-0.3s-combination-180s-combination 6 Rated short circuit current breaking times times 12 7 Rated short circuit closing current (peak) KA 50,63,80 8 Rated peak withstand current 9 Rated short-time withstand current KA 20,25,31.5 10 Rated short circuit continuous current S 4 11 Average opening speed m/s 1.5±0.2 12 Average closing speed 0.7±0.2 13 Contact closing bounce time s ≤2 14 Three-phase combined (minute) gate synchronous time difference ≤2 15 Closing time ≤150 16 Opening time ≤60 17 Mechanical life 次/times 10000 18 Rated operating voltage and auxiliary circuit rated voltage V DC220,110,24 AC220,110,24 19 DC resistance per phase circuit (without transformer) μΩ ≤100 20 Dynamic and static contacts allow wear thickness mm 3 21 weight kg 800
The ZW7-40.5KV Outdoor High Voltage vacuum circuit breaker is an advanced outdoor high-voltage switching device designed for reliable protection and control of electrical power networks. Featuring vacuum interruption technology, robust insulation, and weather-resistant construction, it ensures safety, operational continuity, and low maintenance.
This comprehensive guide provides fault troubleshooting, accessory details, warranty policies, and core advantages, making it essential for engineers, operators, and procurement professionals.
Overview of ZW7-40.5KV Vacuum Circuit Breaker
Core Advantages
Accessory and Component Description
Technical Specifications
Installation Guidelines
Operation Principles
Maintenance and Inspection
Fault Troubleshooting
Warranty and Support Policy
Certifications and Compliance
Conclusion
The ZW7-40.5KV circuit breaker is designed for outdoor high voltage applications, providing:
Vacuum Interruption Technology: Eliminates arcing, reducing wear on contacts.
High Voltage Operation: Rated at 40.5 kV for medium- to high-voltage networks.
Robust Outdoor Design: Weather-resistant, durable, and low maintenance.
Automatic and Remote Control Options: Supports local and remote operations.
IEC Compliance: Ensures global safety and performance standards.
The ZW7-40.5KV circuit breaker delivers multiple benefits for outdoor high-voltage applications:
| Advantage | Description |
|---|---|
| Vacuum Interruption | Provides arc-free switching and long service life |
| Solid Insulation | Enhances reliability and reduces maintenance |
| Outdoor Durability | Weather-resistant for harsh environmental conditions |
| Automatic Reclosing | Ensures operational continuity and reduces outage duration |
| Compact Design | Saves installation space and facilitates integration with existing infrastructure |
| Remote Monitoring Capability | Allows SCADA or automated system integration |
| High Mechanical Reliability | Ensures long-term stability in outdoor applications |
The ZW7-40.5KV vacuum circuit breaker consists of key components designed for safe and efficient operation:
| Component | Function | Specification/Notes |
|---|---|---|
| Vacuum Interrupter | Interrupts fault current | Rated 40.5 kV, IEC compliant |
| Operating Mechanism | Opens and closes contacts | Manual, spring, or motor-operated |
| Control Panel | Signals, control, and monitoring | Digital/analog options |
| Insulated Housing | Provides protection and insulation | High-dielectric solid insulation |
| Indicators and Meters | Voltage, current, and status display | LED, analog, or digital |
| Grounding System | Ensures operator safety and system protection | IEC standard compliant |
| Bushings | Connects incoming/outgoing lines | Porcelain or composite |
| Mounting Hardware | Secures breaker in outdoor environment | Galvanized or stainless steel |
| Specification | Parameter |
|---|---|
| Rated Voltage | 40.5 kV |
| Rated Current | 630–2500 A |
| Short-Circuit Breaking Capacity | 20–40 kA |
| Insulation Level | AC 50 Hz / 42 kV withstand voltage |
| Lightning Impulse Withstand | 185 kV |
| Operating Mechanism | Spring or motor-operated |
| Ambient Temperature | -10°C to +40°C |
| Relative Humidity | ≤95% |
| Protection Grade | IP54 / IP65 (depending on enclosure type) |
Stable, level foundation with adequate drainage
Minimum clearance for operation and maintenance
Avoid areas with corrosive gases, high vibration, or flooding risk
Place the breaker in its designated location.
Secure with anchor bolts and check for level alignment.
Connect incoming and outgoing conductors following wiring diagrams.
Install grounding system per IEC standards.
Verify mechanical operation of all switches and interlocks.
Conduct insulation resistance and functional tests before energization.
| Step | Status/Notes |
|---|---|
| Foundation Stability | Confirmed |
| Mechanical Fastening | Tightened and secure |
| Electrical Connections | Verified |
| Grounding/Earthing | Connected and tested |
| Functional Testing | Completed successfully |
The ZW7-40.5KV breaker operates on automatic fault detection and vacuum interruption principles:
Fault Detection: Monitors short-circuit or overload conditions.
Trip Mechanism: Activates vacuum interrupter to interrupt fault current.
Automatic Reclosing: Restores power if fault is temporary.
Manual Operation: Provides emergency control for operators.
Lockout Function: Prevents reclosing under persistent fault conditions.
Routine maintenance ensures reliable operation and extended service life.
| Task | Frequency | Description |
|---|---|---|
| Visual Inspection | Monthly | Check for corrosion, dust, or mechanical wear |
| Mechanical Operation Test | Quarterly | Test open/close mechanisms |
| Insulation Resistance Measurement | Bi-Annually | Ensure proper insulation condition |
| Lubrication of Moving Parts | Bi-Annually | Maintain smooth operation |
| Component Replacement | As Needed | Replace worn or damaged parts |
Avoid moisture and dust accumulation.
Tighten electrical connections regularly.
Verify proper functioning of interlocks and safety devices.
| Issue | Possible Cause | Recommended Action |
|---|---|---|
| Breaker fails to operate | Mechanical obstruction or misalignment | Inspect and adjust mechanism |
| Trip failure | Faulty sensor or control circuit | Test and replace sensors or wiring |
| Abnormal voltage or current | Loose connections or damaged contacts | Tighten or replace connections |
| Noise during operation | Worn moving parts | Lubricate or replace components |
| Failure to reclosing | Control logic or relay fault | Check control wiring and relays |
The ZW7-40.5KV breaker is backed by a comprehensive warranty and technical support:
Warranty Period: Typically 12–24 months depending on supplier terms.
Coverage: Includes defects in materials, workmanship, and functional performance.
Exclusions: Damage due to misuse, improper installation, or natural disasters.
Technical Support: Available for installation, troubleshooting, and maintenance.
Spare Parts Supply: Guaranteed availability of key components.
The ZW7-40.5KV breaker meets international standards:
IEC 62271 Series: High-voltage switchgear standard
ISO 9001: Quality management certification
CE Marking: Safety and environmental compliance
RoHS Directive: Restriction of hazardous substances
Optional local/national certifications based on market requirements
The ZW7-40.5KV Outdoor High Voltage Vacuum Circuit Breaker is a reliable, maintenance-friendly, and IEC-compliant solution for outdoor medium and high voltage networks. With vacuum interruption, solid insulation, and automatic reclosing, it ensures operational continuity, safety, and long-term durability.
Proper installation, maintenance, and adherence to safety protocols guarantee optimal performance, making it ideal for substations, industrial networks, and outdoor high-voltage applications.
Phone: +8613736779975
E-mail: sales@vcbbreaker.com
Address: 66 Punan Road, Yueqing Economic Development Zone, Zhejiang, China
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