The LW36-40.5 SF6 circuit breaker has an outdoor porcelain post-type structure, equipped with the CT35 spring operating mechanism. The mechanism is arranged in a “T” configuration with the body, making the entire unit compact, lightweight, simple in structure, with low operating power, and easy installation and commissioning. The mechanical life is 10,000 operations, making it suitable for frequent operations. It adopts a compressed air arc-extinguishing chamber with excellent breaking performance, and its electrical life reaches 20,000 operations.
The sealing performance is reliable, with static seals using “O”-shaped sealing rings and dynamic seals using “V”-shaped sealing rings with spring pressure compensation structures. The secondary wiring board for the current transformers is produced using pressure injection molding, providing strong anti-aging performance and ensuring an annual leakage rate of <0.5%.
The installation frame and support are made from rolled steel plates, using high-strength standard components, ensuring high mechanical reliability. The internal or external current transformers use microcrystalline alloy materials with high magnetic conductivity, and the accuracy class can reach 0.2 or 0.2S. The product can be equipped with 2 to 4 current transformers per phase.
No. Parameter Name Unit Parameter Value 1 Rated voltage kV 40.5 2 Rated current A 1600 / 2000 3 Rated insulation level kV 95 (Grounded) / 185 (Contact gap) 4 Rated short-circuit breaking current kA 25 / 31.5 5 Rated out-of-step breaking current kA 7.9 / 10 6 Different-phase ground fault breaking current kA 27.4 / 34.8 7 Rated breaking current of single capacitor bank A 400 8 Rated operating sequence – O—0.3s—CO—180s—CO* 9 SF6 gas rated pressure (20℃ gauge pressure) MPa 0.45 10 Opening time (rated voltage) ms 30 ≤ t ≤ 40 11 Closing time (rated voltage) ms 60 ≤ t ≤ 80 12 Rated short-circuit making current (peak) kA 63 / 80 13 Rated short circuit duration s 4 14 Rated short-time withstand current kA 25 / 31.5 15 Rated peak withstand current kA 63 / 80 16 Mechanical life test Times 10,000 17 Accumulated breaking times (31.5kA/40kA short-circuit) Times 20 18 Rated current cumulative breaking times Times 2000 19 SF6 gas annual leakage rate % ≤0.5 20 SF6 gas trace moisture content ppm (V/V) ≤150×10⁻⁶ 21 External insulation leakage specific distance mm/kV ≥25 / ≥31** 22 Circuit breaker weight kg 1000
The LW36-40.5 Outdoor High Voltage AC SF6 Circuit Breaker is designed to provide reliable, durable, and high-performance electrical protection for outdoor substations and high-voltage networks. With advanced SF6 gas insulation, this breaker ensures efficient arc-quenching, minimal maintenance, and long operational life, making it an ideal solution for industrial grids, power transmission systems, and critical infrastructure.
This article covers core advantages, storage conditions, troubleshooting, and technical advantages, providing a complete guide for engineers, maintenance teams, and procurement specialists.
The LW36-40.5 circuit breaker is rated for 40.5kV AC systems and is suitable for outdoor high-voltage applications, offering secure interruption of overloads, short circuits, and fault currents. Its design ensures durability under extreme environmental conditions, maintaining reliable performance even in harsh climates.
Rated Voltage: 40.5kV
Rated Current: 1250A / 2000A / 3150A / 4000A
Insulation Medium: SF6 gas for optimal arc-quenching
Outdoor Durability: Resistant to dust, UV, humidity, and temperature extremes
Maintenance-Friendly Design: Minimal inspection requirements with long service intervals
| Parameter | Value |
|---|---|
| Product Model | LW36-40.5 Outdoor High Voltage AC SF6 Circuit Breaker |
| Rated Voltage | 40.5 kV |
| Rated Current | 1250A / 2000A / 3150A / 4000A |
| Rated Short-Circuit Current | Up to 31.5 kA |
| Insulation Medium | SF6 Gas |
| Arc Quenching | SF6 Gas Chamber |
| Mechanical Endurance | ≥ 10,000 operations |
| Operating Temperature | -40°C to +50°C |
| Applications | Outdoor substations, power transmission networks |
The LW36-40.5 breaker offers several key advantages for outdoor high-voltage applications:
Ensures stable operation under load and fault conditions.
Minimizes the risk of unplanned outages in critical substations.
Corrosion-resistant housing and components suitable for extreme outdoor environments.
SF6 insulation maintains integrity over long-term operation, reducing the risk of failures.
SF6 gas quickly extinguishes arcs during current interruption.
Reduces wear on contacts and moving components, extending breaker lifespan.
Minimal inspection intervals compared to older oil or air-insulated breakers.
Simplifies lifecycle management, reducing maintenance costs and operational downtime.
Suitable for urban and rural substations, industrial grids, and renewable energy installations.
Supports both load switching and fault isolation with reliable performance.
Proper storage is critical to ensure the LW36-40.5 breaker maintains performance and longevity before installation.
Environment: Store in a dry, dust-free, and temperature-controlled environment.
Humidity: Keep relative humidity below 85% to prevent condensation.
Protection: Avoid direct sunlight, water exposure, and corrosive chemicals.
Positioning: Keep the unit upright; avoid placing heavy objects on the breaker.
SF6 Gas Monitoring: Check pressure periodically to ensure no leakage occurs during storage.
Even with robust design, occasional issues may arise. Here’s a guide to common troubleshooting and solutions:
| Issue | Possible Cause | Recommended Solution |
|---|---|---|
| Breaker fails to close | Mechanical obstruction or misalignment | Inspect operating mechanism, clear blockage |
| High contact resistance | Contact erosion or contamination | Clean or replace contacts, verify torque |
| SF6 gas pressure drop | Leakage or seal failure | Check seals, refill certified SF6 |
| Erratic operation | Improper lubrication or mechanism wear | Lubricate moving parts, inspect mechanism |
| Audible arcing or sparks | Faulty insulation or damaged contacts | Inspect arc chamber, replace damaged parts |
Visual Inspection: Check housing, terminals, and insulation for cracks or corrosion.
Electrical Tests: Measure insulation resistance, contact resistance, and dielectric strength.
Mechanical Tests: Verify operating mechanism, spring tension, and movement speed.
SF6 System Check: Ensure gas integrity and pressure are within recommended limits.
The LW36-40.5 breaker incorporates advanced engineering features to optimize performance:
Provides high dielectric strength and excellent arc-quenching.
Maintains performance under extreme weather and outdoor conditions.
High-conductivity copper or copper alloy contacts ensure efficient current flow.
Robust design minimizes pitting and wear, reducing maintenance frequency.
Motor or spring-driven system enables rapid and reliable switching.
Mechanically tested for ≥ 10,000 operations, ensuring durability.
Components are easily accessible for inspection and maintenance.
Modular construction allows for efficient replacement of parts, minimizing downtime.
Corrosion-resistant housing withstands humidity, dust, UV exposure, and temperature extremes.
Sealed SF6 chamber maintains insulation and arc-quenching performance for long-term outdoor operation.
Correct installation is essential for Safe Operation:
Ensure the substation foundation and grounding comply with electrical standards.
Transport breaker using shock-resistant packaging.
Mount upright on a stable base; secure terminals and busbars.
Check SF6 gas pressure and chamber integrity before energizing.
Test mechanical and electrical operations before connecting to the grid.
The LW36-40.5 breaker undergoes comprehensive testing to guarantee reliability:
| Test Type | Purpose |
|---|---|
| Dielectric Test | Verify insulation withstand voltage |
| Short-Circuit Test | Confirm interruption capability at fault current |
| Current Carrying Test | Ensure continuous operation at rated current |
| Mechanical Endurance Test | Validate long-term switching durability |
| Environmental Simulation Test | Confirm operation under humidity, temperature, and dust |
Certified test reports are provided with each breaker to ensure compliance with IEC 62271 and GB/T 11022 standards.
Proper packaging protects the LW36-40.5 breaker during transport:
| Packaging Component | Description |
|---|---|
| Outer Crate | High-strength, moisture-proof wooden crate |
| Cushioning | Shock-absorbing padding to prevent mechanical damage |
| SF6 Gas Safety | Sealed and factory-tested SF6 chamber |
| Labeling | Model, voltage rating, and handling instructions |
| Export Compliance | ISPM 15 and international shipping standards |
Shipping options include air freight, sea freight, and land transport, with anti-vibration stabilization for long-distance delivery.
“The LW36-40.5 breaker ensures stable outdoor operation under extreme conditions. Its reliability and SF6 insulation reduce maintenance needs and improve grid uptime.”
“Durable design and efficient arc-quenching allow safe operation in high-voltage networks. Maintenance intervals are long, saving both labor and operational costs.”
“Our solar and wind substations rely on LW36-40.5 for stable, reliable switching. Even under fluctuating loads, these breakers perform consistently and safely.”
Reliable Operation: Handles 40.5kV AC systems with minimal risk of failure.
Durable Construction: Resistant to outdoor environmental stressors.
Maintenance-Friendly: Low frequency of inspections and servicing.
Global Compliance: IEC and GB/T certified.
Technical Support: Full after-sales service and professional guidance.
The LW36-40.5 Outdoor High Voltage AC SF6 Circuit Breaker is a premium solution for outdoor substations and high-voltage networks, providing reliable, durable, and efficient electrical protection. Its robust SF6 insulation, long-term mechanical endurance, and proven reliability make it ideal for industrial, utility, and renewable energy applications.
With comprehensive performance testing, modular design, environmental resistance, and technical support, LW36-40.5 ensures safe, stable, and long-term protection of critical power transmission infrastructure.
Phone: +8613736779975
E-mail: sales@vcbbreaker.com
Address: 66 Punan Road, Yueqing Economic Development Zone, Zhejiang, China
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