The LW36-126T High Voltage AC SF6 Tank Circuit Breaker integrates the circuit breaker and current transformer into a single unit. The arc-extinguishing chamber is horizontally mounted inside a grounded aluminum alloy housing and is paired with a CT26-type spring operating mechanism. The design features fewer components, a simple and compact layout, and a robust, durable structure, meeting the requirements for oil-free switches. With excellent mechanical properties and high reliability, all critical components are processed using CNC machining centers. The bearings used are imported international brands (e.g., IKO, INA, SKF). The mechanical life can reach up to 10,000 operations.
This circuit breaker is suitable for outdoor high-voltage switchgear in three-phase 50Hz AC systems and is used for control and protection in 72.5 (126) kV power transmission and distribution systems. It can also be used for circuit breaker connections and for switching capacitor banks.
The circuit breaker uses a three-phase porcelain pillar single-break structure, with a spring-operated mechanism centrally arranged and linked across the three phases, giving it an elegant and compact appearance. SF6 gas serves as both the insulating and arc-quenching medium. During operation, the three poles of the circuit breaker are interconnected with SF6 gas, and a pointer-type density relay monitors the pressure and density of the gas.
Thanks to the use of the self-energy arc-extinguishing principle and optimization of the breaker’s mechanical system design, mechanical efficiency is greatly improved, reducing operating power to a minimum. The breaker has excellent interrupting performance and a long electrical life.
The installation base and support frame are made from high-quality steel plates, with the surface treated using hot-dip galvanizing. All exposed fasteners are made from high-strength materials, with either hot-dip galvanizing or stainless steel components. The mechanism box is made from stainless steel, providing excellent corrosion resistance and high mechanical reliability for frequent operation.
With the inherent high insulating strength of SF6 gas and optimal contact movement, the breaker is capable of interrupting capacitive currents without re-ignition. The external insulation is designed with a large creepage distance (>31mm/kV), ensuring excellent resistance to contamination, allowing it to operate safely in harsh environments.
The breaker also has a strong current-carrying capacity: under a current of 1.2 times the rated value (3150A × 1.2 = 3780A), temperature rise tests show a considerable safety margin. The product’s overall appearance is compact, making on-site installation and commissioning easy with minimal maintenance required.
No. Parameter Name Unit Parameter Value 1 Rated voltage kV 126 2 Rated power frequency withstand voltage (1min) – Grounded kV K – 230 – Contact gap kV K – 265 3 Rated lightning impulse withstand voltage – Grounded kV K – 550 – Contact gap kV K – 630 4 Power frequency withstand voltage of SF6 gas at zero gauge pressure (5min) Hz K – 95 5 Rated frequency Hz 50 6 Rated current A 3150 7 First pole to clear factor – 1.5 8 Rated short-circuit breaking current kA 40 9 Rated short-circuit making current (peak) kA 100 10 Rated short-circuit withstand current kA 40 11 Rated peak withstand current kA 100 12 Rated short-circuit duration s 4 13 Rated out-of-step breaking current kA 10 14 Short-line fault breaking current kA 90% lk, 75% lk 15 Rated line charging switching current A 31.5 16 Rated operating sequence – O-0.3s-CO-180s-CO 17 Main circuit resistance μΩ ≤500 18 Rated SF6 gas pressure (20℃ gauge pressure) MPa 0.5 19 Alarm/minimum function pressure (20℃ gauge pressure) MPa 0.45±0.03 20 SF6 gas annual leakage rate – <0.5% 21 Gas moisture content (V/V) ppm ≤150×10⁻⁶ 22 Mechanical life Times 10000 23 Radio interference level μV ≤500 24 Creepage distance mm 3906/3150 25 Weight of SF6 gas per unit kg 15 26 Weight of each circuit breaker kg 2200
The LW36 126T3150 40 High Voltage AC SF6 Tank Type Circuit Breaker is engineered for high-voltage substations and power distribution systems, delivering reliable, durable, and efficient electrical protection. Featuring GIS (Gas-Insulated Switchgear) technology and SF6 insulation, it provides superior arc-quenching, minimal maintenance, and stable performance under challenging conditions.
This guide covers operating tips, safety procedures, usage precautions, and step-by-step methods, making it an essential reference for engineers, technicians, and power utility managers.
The LW36 126T3150 40 is a tank-type SF6 circuit breaker rated for 126kV AC systems, designed to handle high currents and fault conditions in substations. Its GIS design reduces space requirements while enhancing operational reliability and environmental protection.
Rated Voltage: 126kV
Rated Current: 3150A
Interrupting Capacity: Up to 40kA
Insulation Medium: SF6 gas for efficient arc quenching
Compact Design: Ideal for GIS substations
Durability: Resistant to corrosion, dust, and humidity
Safety: Built-in interlocks and monitoring systems
| Parameter | Value |
|---|---|
| Product Model | LW36 126T3150 40 High Voltage AC SF6 Circuit Breaker |
| Rated Voltage | 126 kV |
| Rated Current | 3150A |
| Rated Short-Circuit Current | 40 kA |
| Insulation Medium | SF6 Gas |
| Arc Quenching | SF6 Gas Chamber |
| Mechanical Endurance | ≥ 10,000 operations |
| Operating Temperature | -40°C to +50°C |
| Applications | Outdoor/Indoor substations, GIS, power distribution |
Correct operation ensures long-term reliability and safety:
Pre-Operation Check
Inspect housing and terminals for cracks, corrosion, or mechanical damage.
Verify SF6 gas pressure is within the manufacturer’s recommended range.
Ensure mechanical linkages and spring mechanisms are properly tensioned.
Normal Operation
Operate the breaker only from the control panel or authorized remote systems.
Avoid frequent switching under load to reduce wear on contacts.
Confirm interlocks are engaged before energizing the circuit.
Shutdown Procedure
Disconnect load gradually before full opening.
Ensure all phases are de-energized before performing maintenance.
Follow manufacturer guidelines for manual closing or opening in emergency scenarios.
Safety is critical for high-voltage operations.
Wear insulated gloves, safety goggles, and protective footwear.
Maintain safe distance from live components.
Ensure all tools are rated for high-voltage use.
Implement LOTO procedures before maintenance.
Verify zero voltage using calibrated instruments.
Apply warning tags and isolation devices to prevent accidental energization.
SF6 is non-toxic but heavier than air; ensure proper ventilation.
Avoid direct inhalation and monitor for leaks with certified detectors.
Follow proper handling, storage, and disposal procedures for SF6.
To maintain performance and extend lifespan, observe these precautions:
Avoid Moisture Ingress
Keep seals and joints intact to prevent water or condensation entry.
Prevent Mechanical Damage
Handle the breaker carefully during transport and installation.
Avoid impacts on SF6 chambers and operating mechanisms.
Monitor Electrical Parameters
Regularly check contact resistance, insulation resistance, and arc voltage.
Detect early anomalies in operation to prevent failures.
Temperature Considerations
Operate within the specified -40°C to +50°C range.
Protect breaker from extreme heat sources or direct sunlight for prolonged periods.
Transport the breaker using shock-resistant packaging.
Place on a level foundation with proper grounding.
Connect busbars and terminals securely and torque per specifications.
Check SF6 gas pressure and seals before energization.
Perform mechanical operation tests without load.
Conduct electrical testing: insulation resistance, contact resistance, and dielectric withstand.
Verify control system communication and interlocks.
Energize slowly while monitoring for abnormal sounds, temperature, or vibration.
Operate breaker from control panel or SCADA system.
Limit switching frequency to manufacturer recommendations.
Record each operation in maintenance logs for performance tracking.
Regular maintenance ensures safe and reliable operation:
Visual inspection of housing, terminals, and operating mechanism.
Verify SF6 gas pressure and leakage.
Electrical tests: contact resistance and insulation resistance.
Mechanical tests: spring tension and linkage operation.
Full disassembly and inspection of contacts, arc chambers, and SF6 seals.
Lubrication of moving components.
Update technical records and performance certificates.
| Issue | Possible Cause | Recommended Solution |
|---|---|---|
| Breaker fails to open | Mechanical obstruction, worn spring | Inspect and lubricate mechanism, replace springs |
| SF6 pressure low | Gas leak or seal failure | Locate leak, refill certified SF6 gas |
| Contact welding | High fault current or frequent operation | Inspect contacts, replace if eroded |
| Erratic operation | Electrical control failure or misalignment | Check control circuits, realign mechanism |
| Abnormal noise or vibration | Loose components or mechanical wear | Tighten connections, inspect moving parts |
GIS Compact Design
Reduces space requirements while improving safety and accessibility.
High Interrupting Capacity
Handles 40kA short-circuit currents efficiently.
SF6 Insulation
Provides excellent dielectric strength and arc-quenching.
Durable Contacts
Copper alloy contacts ensure high conductivity and long-term performance.
Monitoring and Interlocks
Built-in systems for remote monitoring, safety interlocks, and operation status.
| Component | Description |
|---|---|
| Outer Crate | High-strength, moisture-resistant wooden crate |
| Internal Cushioning | Foam padding for shock absorption |
| SF6 Chamber | Sealed and factory-tested |
| Labeling | Model, voltage rating, handling instructions |
| Export Compliance | Meets ISPM 15 international shipping standards |
Air Freight: Fast delivery for urgent orders
Sea Freight: Suitable for bulk shipments
Land Transport: Anti-vibration support for stability
“LW36 126T3150 40 GIS breakers provide reliable performance in high-voltage networks. Maintenance is minimal, and SF6 insulation ensures safety even in extreme weather.”
“The breaker delivers smooth and stable switching. Our high-voltage distribution system has improved reliability and efficiency since installation.”
“Using LW36 126T3150 40 in our GIS substations ensures safe and continuous operation. We trust it for critical power distribution needs.”
Reliable Operation: Handles high voltage and fault currents safely.
Durable Construction: Long-term resistance to environmental stress.
Maintenance-Friendly: Extended intervals between inspections.
Certified Compliance: IEC and GB/T standards.
Professional Support: Technical guidance and after-sales service.
The LW36 126T3150 40 High Voltage AC SF6 Tank Type Circuit Breaker provides premium GIS protection for substations and power distribution networks. With robust SF6 insulation, durable contacts, and reliable mechanical operation, it ensures safe, efficient, and long-term electrical protection.
Its compact GIS design, monitoring features, and safety interlocks make it suitable for industrial, utility, and renewable energy applications, while rigorous maintenance procedures and technical support guarantee uninterrupted operation.
Phone: +8613736779975
E-mail: sales@vcbbreaker.com
Address: 66 Punan Road, Yueqing Economic Development Zone, Zhejiang, China
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