The LW36-145/3150-40 self-powered SF6 circuit breaker is an outdoor type product, suitable for use in power grids with a maximum voltage of 145 kV, operating at 50 Hz and altitudes not exceeding 3000 meters, with an ambient temperature no lower than -40°C, and environmental pollution levels not exceeding level IV.
It is designed to disconnect rated current, fault current, or switch lines, achieving control and protection of the power system. It can also be used as a link circuit breaker.
This product uses SF6 gas as the arc-extinguishing and insulating medium, and incorporates the most advanced self-powered arc-extinguishing technology. It is equipped with a new type of spring operating mechanism, offering features such as long electrical life, low operating force, low noise, and high reliability.
Its simple structure, compact size, and long maintenance intervals make it an ideal choice for high-altitude regions or 132 kV Power Systems. It can replace similar imported products.
The circuit breaker adopts a three-phase porcelain column-type single-break structure, with a single spring operating mechanism shared by the three phases. It is centrally arranged with three-phase interlocking, giving it an innovative and refined appearance.
The circuit breaker uses SF6 gas as both the insulating and arc-extinguishing medium. During operation, the three poles of the breaker are connected via SF6 gas, and a pointer-type density relay is used to monitor its pressure and density progress. Due to the use of self-powered arc-extinguishing technology and optimized design in the breaker’s motion system, the mechanical efficiency is effectively improved, minimizing the operating force. The breaking performance is excellent, and the electrical life is long.
The installation base and support frame are made of high-quality steel plates, formed by overall bending. The surface is treated with hot-dip galvanizing, and all exposed fasteners are made from high-strength materials, either hot-dip galvanized or made of stainless steel. The mechanism box casing is made of stainless steel, ensuring excellent corrosion resistance, high mechanical reliability, and the ability to withstand frequent operations.
| No. | Parameter Name | Unit | Value |
| 1 | Rated voltage | kV | LW36-126KV |
| 2 | Insulation level | kV | See Table 2 |
| 3 | Rated frequency | Hz | 50 |
| 4 | Rated current | A | 3150 |
| 5 | Rated short-circuit breaking current | kA | 40 |
| 6 | Rated short-time withstand current | kA | 40 |
| 7 | Rated peak withstand current | kA | 100 |
| 8 | Rated short-circuit duration | s | 3 |
| 9 | Rated short-circuit making current (peak) | kA | 100 |
| 10 | Near-zone fault breaking current | kA | 36/30 |
| 11 | Rated line charging breaking current | A | 31.5 |
| 12 | Rated out-of-step breaking current | kA | 10 |
| 13 | Cumulative short-circuit breaking operations | times | 20 |
| 14 | First pole-to-clear factor | – | 1.5 |
| 15 | SF6 gas pressure (20°C) | MPa | 0.5 |
| 16 | Rated voltage of control/auxiliary circuits | – | DC220V / DC110V* |
| 17 | Rated operating sequence | – | O-0.3s-CO-180s-CO |
| 18 | Mechanical characteristics | μΩ | See Table 5 |
| 19 | Rated main circuit resistance | μΩ | ≤55 |
| 20 | Mechanical endurance | times | 10000 |
| 21 | Terminal static pull force | N | Horizontal longitudinal：1250 |
| Horizontal lateral: 750 | |||
| Vertical direction: 1000 | |||
| 22 | SF6 gas annual leakage rate | % | ≤1 |
| 23 | SF6 gas moisture content (V/V) | ppm | ≤150±4 |
| 24 | Contact travel | mm | 150±4 |
| 25 | Contact closing travel | mm | 25+3 |
The LW36-145 Outdoor SF6 Circuit Breaker 40.5kV is an advanced solution for automatic power distribution and high-voltage electrical protection in outdoor substations. Combining SF6 gas insulation with high-voltage switching capability, this breaker ensures reliable, durable, and efficient protection against overloads, short circuits, and fault currents in power distribution networks.
This article provides a comprehensive guide covering installation instructions, product highlights, performance characteristics, and quick installation tips, making it an essential reference for engineers, maintenance teams, and procurement professionals.
The LW36-145 is designed for outdoor 40.5kV AC networks, supporting automatic switching and high-reliability fault protection. Its SF6 insulation provides superior arc-quenching and enhanced operational safety, while the robust outdoor design ensures durability under extreme weather conditions.
Rated Voltage: 40.5kV
Rated Current: 1250A / 2000A / 3150A / 4000A (depending on configuration)
Insulation Medium: SF6 gas for efficient arc quenching
Automatic Operation: Remote control and automatic switching capabilities
Durable Construction: Resistant to dust, humidity, UV exposure, and corrosion
Maintenance-Friendly: Minimal inspection requirements with long service intervals
| Parameter | Value |
|---|---|
| Product Model | LW36-145 Outdoor SF6 Circuit Breaker |
| Rated Voltage | 40.5 kV |
| Rated Current | 1250A / 2000A / 3150A / 4000A |
| Rated Short-Circuit Current | 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, automatic power distribution networks |
The LW36-145 breaker incorporates several advanced features to ensure high performance:
Provides high dielectric strength and efficient arc quenching.
Minimizes wear on contacts, extending operational life.
Supports remote operation via SCADA or control systems.
Enables quick fault isolation and load management without manual intervention.
Weather-resistant housing protects against UV, dust, humidity, and corrosion.
Sealed components prevent moisture ingress and maintain performance.
Capable of handling 31.5kA short-circuit currents safely.
Ensures reliable protection for critical power infrastructure.
Minimal inspection and lubrication requirements.
Easy access to key components for routine checks and repairs.
The LW36-145 delivers reliable and high-performance operation under demanding conditions:
| Feature | Description |
|---|---|
| Arc Quenching | SF6 gas chamber ensures fast and safe arc extinction |
| Operating Mechanism | Motor or spring-operated for rapid switching |
| Contact System | High-conductivity copper alloy contacts minimize wear |
| Mechanical Endurance | ≥ 10,000 operations under rated load |
| Environmental Resistance | Resistant to temperature extremes, moisture, and dust |
| Safety Interlocks | Prevents accidental operation under unsafe conditions |
Proper installation ensures safe and reliable operation of the LW36-145 breaker.
Verify foundation stability and proper grounding.
Ensure adequate clearance for operation and maintenance.
Confirm environmental conditions are within specified operating range (-40°C to +50°C).
Use shock-resistant packaging during transport.
Avoid dropping or impacting the SF6 tank.
Ensure handling equipment supports the weight and dimensions of the breaker.
Place the breaker on a level, solid foundation.
Secure terminals and busbars according to manufacturer torque specifications.
Align breaker with incoming and outgoing feeders accurately.
Connect power, control, and monitoring circuits securely.
Check phase alignment and insulation resistance before energization.
Verify all interlocks and safety devices are operational.
Measure SF6 gas pressure to ensure it is within the manufacturer’s recommended range.
Inspect seals and joints for leakage or damage.
| Task | Recommendation |
|---|---|
| Foundation | Level and stable, suitable for outdoor mounting |
| Breaker Positioning | Upright orientation, ensure accessibility |
| Terminal Connections | Torque to manufacturer specifications |
| SF6 Pressure Check | Confirm within recommended range |
| Mechanical Test | Operate manually before energizing |
| Electrical Test | Insulation and continuity checks |
| Control System Verification | Test remote operation and interlocks |
Conduct visual inspection for damage or dirt.
Verify SF6 pressure, operating mechanism, and interlocks.
Record baseline readings for contact resistance and insulation resistance.
Use remote control or automatic switching for load and fault management.
Avoid frequent manual switching under load to extend contact life.
Monitor temperature, vibration, and audible indicators during operation.
Follow manual override procedures if automatic controls fail.
Ensure load is disconnected safely before manual operation.
Use rated tools and protective equipment for high-voltage operation.
Regular maintenance ensures reliable and long-term performance.
Inspect housing, terminals, and SF6 chamber monthly.
Check mechanical linkages, spring tension, and operation speed.
Verify contact resistance and insulation resistance quarterly.
Disassemble key components for inspection.
Clean and lubricate moving parts as needed.
Refill or replace SF6 gas if pressure or purity is outside specifications.
| Issue | Possible Cause | Recommended Solution |
|---|---|---|
| Breaker fails to open | Mechanical obstruction or spring failure | Inspect mechanism, replace springs |
| SF6 pressure low | Leakage or seal damage | Locate leak, refill certified SF6 |
| High contact resistance | Contact erosion or contamination | Clean or replace contacts |
| Erratic operation | Electrical control issue or misalignment | Check control circuits, realign mechanism |
| Abnormal noise or vibration | Loose or worn components | Tighten connections, inspect moving parts |
SF6 Arc Quenching
Rapidly extinguishes arcs, reducing wear and enhancing safety.
Automatic Control
Enables remote operation and automatic fault response.
Durable Construction
Withstands extreme weather, corrosion, and UV exposure.
High Interrupting Capacity
Handles short-circuit currents up to 31.5kA.
Maintenance-Friendly Design
Easy access to moving parts and minimal lubrication requirements.
| Component | Description |
|---|---|
| Outer Crate | High-strength wooden crate, moisture-proof |
| Internal Cushioning | Shock-absorbing padding to prevent damage |
| SF6 Chamber | Factory-sealed and pressure-tested |
| Labeling | Model, voltage rating, handling instructions |
| Export Compliance | ISPM 15 and international shipping standards |
Air Freight: For urgent installations
Sea Freight: Bulk shipments with protective stabilization
Land Transport: Shock-absorbing supports for long-distance delivery
“The LW36-145 breaker provides stable automatic switching in our outdoor substations. SF6 insulation ensures minimal maintenance and reliable performance even under heavy load conditions.”
“Durable and efficient, this breaker simplifies our power distribution management while providing high reliability for critical circuits.”
“Our GIS substations rely on LW36-145 for safe, automatic load management. Its quick installation and robust performance make it a dependable choice.”
Reliable Operation: Ensures safe switching under high-voltage conditions.
Durable Construction: Long-lasting outdoor performance with minimal maintenance.
Automatic Functionality: Supports remote and automatic operation for efficiency.
Technical Compliance: IEC and GB/T certified.
Professional Support: Installation guidance, after-sales support, and training available.
The LW36-145 Outdoor SF6 Circuit Breaker 40.5kV provides high-reliability electrical protection for outdoor substations and power distribution networks. Its SF6 insulation, automatic operation, durable construction, and maintenance-friendly design ensure efficient fault management, safe load distribution, and long-term performance.
With quick installation guides, technical advantages, and performance reliability, LW36-145 is ideal for industrial, utility, and renewable energy applications, offering safe, efficient, and long-lasting electrical protection.
Phone: +8613736779975
E-mail: sales@vcbbreaker.com
Address: 66 Punan Road, Yueqing Economic Development Zone, Zhejiang, China
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