This product uses SF6 gas as the arc-extinguishing and insulating medium and incorporates the world’s most advanced self-energy arc-extinguishing technology. Equipped with a new type of spring operating mechanism, it features long electrical life, low operating force, low noise, high reliability, a simple structure, compact size, and an extended maintenance-free period. In the current trend toward oil-free and high-capacity power equipment, this product can fully replace similar imported products.
The circuit breaker adopts a three-phase porcelain column single-break structure, with a spring operating mechanism for each phase. The three-phase electrical interlock gives it a sleek and sophisticated appearance. The breaker uses SF6 gas as an insulating and arc-quenching medium and is monitored for pressure and density by a pointer-type density relay.
Due to the self-energy arc-extinguishing principle and optimized design of the breaker’s mechanical system, the mechanical efficiency is significantly improved, and the operating power is minimized. The breaker offers excellent breaking performance and a long electrical lifespan.
Each pole is mounted on an individual mechanism box, which is centrally installed on the base. Inside the box, there is a spring operating mechanism and an electrical control unit. The output rod of the mechanism is connected to the operating lever. The mechanism box bracket is treated with hot-dip galvanizing, and the fasteners are also hot-dip galvanized. The box housing is made of stainless steel, providing excellent corrosion resistance.
The breaker boasts high mechanical reliability and is capable of frequent operations. Thanks to the inherent high insulation strength of SF6 gas and the optimized contact movement of the circuit breaker, it can interrupt capacitive currents without re-ignition. The external insulation has a high creepage distance and excellent resistance to pollution. It also has strong current-carrying capacity. During a temperature rise test conducted at 1.2 times the rated current of 4000A, there is still a significant margin for temperature rise at each point. The overall appearance of the product is compact, easy to install and debug on-site, and requires minimal maintenance.
NO. Name Unit Parameter 1 Rated voltage 252 2 Rated power frequencywithstand voltage (1 min) Contact gap KV 460
460+1463 Grounded 4 Rated lightning impulse withstand voltage Contact gap 1050
1050+2065 Grounded 6 Rated frequency HZ 50 7 Rated current A 4000 8 Initial pole factor 1.3 9 Rated short-circuit breaking current KA 50 10 Rated short-circuit making current (peak value) KA 125 11 Rated short circuit withstand current KA 50 12 Rated peak withstand current 125 13 Rated short circuit duration S 3 14 Rated out-of-step breaking current KA 12.5 15 Short-line fault breaking current KA 90%lk,75%lk 16 Rated line charging switching current A 200 17 Rated operating sequence 0-0.3s-CO180S-CO 18 Main circuit resistance μ Ω ≤55 19 Rated SF6 gas pressure (20°C gauge pressure) MPA 0.6 20 Alarm/Minimum functional pressure (20°C gauge) MPA 0.55±0.015/0.50±0.015 21 Annual leakage rate of SF6 gas ≤0.5% 22 Gas moisture content (V/V) PPM ≤150 23 Mechanical life Second 10000 24 Radio Interference Level μV ＜500 25 Creepage Distance Break distance mm ≥8660 26 Earth ≥6900 27 Weight ofeach unit filled with SF6 gas kg 240 28 Weight of each circuit breaker kg 1500
The LW-252/4000-50 Outdoor SF6 Circuit Breaker is a high-voltage electrical protection device designed for outdoor substations, power distribution networks, and critical industrial applications. With a rated voltage of 252kV, current capacity of 4000A, and short-circuit interrupting capability of 50kA, it ensures reliable and durable protection against electrical faults.
This article provides a comprehensive guide covering applicable scenarios, troubleshooting procedures, cleaning methods, and core advantages, making it an essential reference for engineers, substation operators, and procurement professionals.
The LW-252/4000-50 is specifically designed for high-voltage outdoor applications, combining SF6 insulation technology with advanced mechanical operation. Its robust design ensures long-term reliability, minimal maintenance, and high operational efficiency.
Rated Voltage: 252kV
Rated Current: 4000A
Interrupting Capacity: 50kA
Insulation Medium: SF6 gas for efficient arc-quenching
Outdoor Durability: Resistant to dust, humidity, UV, and extreme weather
Low Maintenance: Minimal routine inspection requirements
Automatic and Manual Operation: Flexible control options for substation integration
| Parameter | Value |
|---|---|
| Product Model | LW-252/4000-50 Outdoor SF6 Circuit Breaker |
| Rated Voltage | 252 kV |
| Rated Current | 4000A |
| Rated Short-Circuit Current | 50 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, industrial power networks |
The LW-252/4000-50 breaker is suitable for a wide range of high-voltage applications, including:
Outdoor Substations
Provides reliable electrical protection for transmission lines and distribution networks.
Operates efficiently under extreme weather conditions, including high winds, humidity, and temperature variations.
Industrial Power Distribution
Protects high-power industrial equipment from overloads and short-circuits.
Supports automated control systems for safe and efficient load management.
Renewable Energy Integration
Suitable for solar, wind, and hydroelectric power substations.
Ensures safe switching and fault interruption in distributed energy networks.
Critical Infrastructure
Protects data centers, airports, and large commercial facilities requiring high-reliability power distribution.
Troubleshooting ensures continuous, Safe Operation of the breaker. Common issues and solutions include:
| Issue | Possible Cause | Recommended Solution |
|---|---|---|
| Breaker fails to close | Mechanical obstruction or misalignment | Inspect operating mechanism, adjust alignment |
| Breaker fails to open | Spring or actuator failure | Check spring tension, repair actuator |
| SF6 gas pressure low | Leakage or seal damage | Locate leak, refill certified SF6 gas |
| High contact resistance | Contact erosion or contamination | Clean or replace contacts |
| Erratic operation | Control circuit malfunction | Inspect control wiring, replace faulty components |
| Abnormal noise or vibration | Loose or worn mechanical components | Tighten connections, replace worn parts |
Regular cleaning and maintenance are critical for high-voltage reliability.
External Housing
Wipe with a soft, lint-free cloth.
Avoid abrasive materials that could damage insulation or paint.
Insulators and Terminals
Use dry, non-conductive brushes to remove dust or debris.
For stubborn contamination, use approved SF6-compatible cleaning solutions.
Arc Chambers and Contacts
Inspect copper alloy contacts for wear or oxidation.
Clean contacts with non-abrasive materials and ensure proper alignment.
| Frequency | Task |
|---|---|
| Monthly | Visual inspection of housing, terminals, and SF6 chamber |
| Quarterly | Mechanical operation tests, lubrication of moving parts |
| Annually | Full inspection: contacts, SF6 seals, arc chamber, and control circuits |
The LW-252/4000-50 breaker offers several distinct advantages:
Designed for continuous operation under harsh outdoor conditions.
SF6 insulation ensures rapid arc extinction and reduced contact wear.
Rated to handle 50kA short-circuit currents, ensuring safe operation in high-stress scenarios.
Weather-resistant housing protects against UV radiation, dust, humidity, and corrosion.
Long mechanical lifespan of over 10,000 operations.
Supports automatic and manual control, integrating with SCADA and substation automation systems.
Reliable switching reduces the risk of downtime and electrical faults.
Easy access to contacts, arc chambers, and operating mechanisms for quick inspection and repair.
Minimal lubrication requirements reduce operational costs.
Proper installation is essential to maximize performance and lifespan:
Verify foundation stability and proper grounding.
Ensure sufficient clearance for operation, maintenance, and ventilation.
Check environmental conditions are within -40°C to +50°C.
Use shock-resistant packaging and lifting equipment.
Avoid impacts on the SF6 tank and mechanical components.
Install the breaker on a level, solid foundation.
Connect busbars and terminals per torque specifications.
Align phases accurately to incoming and outgoing feeders.
Verify SF6 pressure is within manufacturer’s recommended range.
Inspect all seals and joints for leakage or damage.
Perform insulation resistance, contact resistance, and continuity tests.
Verify control circuits, interlocks, and monitoring systems.
| Feature | Description |
|---|---|
| Arc Quenching | SF6 gas chamber for fast, safe arc extinction |
| Mechanical Operation | Spring or motor mechanism for rapid switching |
| Contact System | Copper alloy contacts for high conductivity |
| Environmental Resistance | Weatherproof, UV and dust-resistant housing |
| Safety Interlocks | Prevent accidental operation under unsafe conditions |
| Control Options | Supports SCADA, remote, and manual operation |
“The LW-252/4000-50 breaker provides excellent reliability and safety in our high-voltage outdoor substations. Minimal maintenance and robust design make it ideal for long-term operation.”
“Our industrial power distribution networks benefit from high-current capacity and fast fault interruption. LW-252/4000-50 is durable and easy to maintain.”
“Deploying LW-252/4000-50 ensures safe, reliable protection for our solar and wind substations. Its SF6 insulation and robust construction are perfect for harsh outdoor environments.”
Reliable High-Voltage Protection: Handles 252kV and 50kA fault conditions safely.
Durable Outdoor Design: Resistant to weather, dust, and corrosion.
Maintenance-Friendly: Minimal routine inspections with easy access to critical components.
Flexible Operation: Automatic and manual control for SCADA and substation integration.
Compliance: IEC and GB/T certified for global applications.
Professional Support: Installation guidance, technical support, and after-sales service.
The LW-252/4000-50 Outdoor SF6 Circuit Breaker 252kV 4000A 50kA provides high-performance electrical protection for outdoor substations, industrial networks, and critical infrastructure. Its SF6 insulation, durable construction, high interrupting capacity, and maintenance-friendly design make it an ideal solution for reliable, safe, and long-term power distribution protection.
With applicable scope, troubleshooting guidance, cleaning methods, and core advantages, LW-252/4000-50 ensures safe, efficient, and durable operation in demanding high-voltage applications.
Phone: +8613736779975
E-mail: sales@vcbbreaker.com
Address: 66 Punan Road, Yueqing Economic Development Zone, Zhejiang, China
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