The LW16-40.5 Outdoor SF6 Circuit Breaker is designed for use in a 50 Hz three-phase AC power system and is suitable for control and protection in industrial enterprises, power plants, and substations. This product is capable of frequent operations and can be used as a link circuit breaker and for switching capacitor banks or reactor banks. The internal current transformers can be used for measurement and protection. It can directly replace the SW2-35 oil circuit breaker and, with the addition of an overcurrent bracket, can replace various models of oil circuit breakers. It is an ideal oil-free circuit breaker for 35 kV Power Systems.
Note: When the circuit breaker is in hot standby mode, surge arresters must be installed on the fault side of the breaker.
No. Parameter Name Unit Parameter Value 1 Rated voltage kV 40.5 2 1-Minute power frequency withstand voltage kV 95 (Grounded) / 185 (Contact gap) 3 Rated frequency Hz 50 4 Rated current A 1600, 2000 5 Rated short-circuit breaking current kA 25 (reclosing), 31.5 (single separation) 6 Rated short-circuit making current (peak) kA 63 7 Rated short-time withstand current kA 25 8 Rated short circuit duration s 4 9 Rated peak withstand current kA 63 10 Rated operating sequence – O—0.3s—CO—180s—CO 11 Rated switching current for a single capacitor bank A 400 12 Rated out-of-step breaking current kA 6.3 13 Rated out-of-phase breaking current kA 21.75 14 Mechanical life test Times 3000 15 Rated cumulative breaking times (rated current) Times 2000 16 Rated cumulative breaking times (25kA short-circuit) Times 21 17 Tripping time s ≤0.06 (rated/max voltage) / ≤0.10 (min voltage) 18 Closing time s ≤0.15 19 SF6 gas rated pressure (20℃ gauge pressure) MPa 0.60±0.015 20 SF6 gas refill alarm pressure (20℃ gauge pressure) MPa 0.55±0.015 21 SF6 gas minimum functional pressure (20℃ gauge) MPa 0.52±0.015 22 SF6 gas annual leakage rate %/Year ≤1 23 SF6 gas trace moisture content ppm (V/V) ≤150×10⁻⁶ 24 CT14-A mechanism coil rated voltage V DC: 110/220; AC: 220/380 25 SF6 gas weight kg Normal: 2.5; CT: 6; Elevated CT: 8 26 Circuit breaker weight kg 1000 27 External insulation leakage specific distance mm/kV ≥31 28 Porcelain insulator leakage distance mm ≥1255
Notes:
O: Open operation
CO: Close-Open operation
s: Seconds
ppm: Parts per million
CT: Current Transformer configuration
Values with tolerances (e.g., ±0.015) and conditional parameters (e.g., reclosing/single separation) are explicitly stated.
Units standardized (e.g., “kV” for kilovolts, “MPa” for megapascals).
Scientific notation corrected (e.g., “≤150×10⁻⁶” instead of “X10-6”).
Combined entries (e.g., tripping time under different voltages) are merged for clarity.
The LW16-40.5 Outdoor SF6 Circuit Breaker is a high-voltage switching device designed for reliable, durable, and efficient electrical protection in power transmission systems and outdoor substations. Engineered with SF6 gas insulation, it provides superior arc-quenching, stable operation, and long-term reliability.
This article explores the product structure, maintenance techniques, quality control procedures, and main functions, helping engineers, technical managers, and purchasing professionals understand the full advantages of the LW16-40.5 breaker.
The LW16-40.5 is intended for 40.5kV outdoor high-voltage networks, offering safe and efficient fault interruption. Its design ensures reliable operation under harsh environmental conditions, making it ideal for substations, industrial grids, and transmission networks.
Rated Voltage: 40.5kV
Rated Current: 1250A / 2000A / 3150A (customizable options)
Insulation Medium: SF6 gas for high-performance arc quenching
Outdoor Durability: Resistant to dust, humidity, temperature extremes, and UV exposure
Long Service Life: Designed for thousands of mechanical and electrical switching operations
| Parameter | Value |
|---|---|
| Product Model | LW16-40.5 Outdoor SF6 Circuit Breaker |
| Rated Voltage | 40.5 kV |
| Rated Current | 1250A / 2000A / 3150A |
| 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 LW16-40.5 Outdoor SF6 Circuit Breaker features a modular and robust design to withstand high-voltage and outdoor environmental challenges.
Circuit Interrupter: Equipped with SF6 gas chamber to extinguish arcs efficiently.
Operating Mechanism: Spring or motor-driven mechanism ensures fast and reliable switching.
Insulated Support: Porcelain or composite insulation for structural and electrical safety.
Current and Voltage Terminals: High-conductivity copper or alloy terminals for efficient power transmission.
Provides superior insulation and arc-quenching.
Equipped with pressure monitoring system to ensure optimal performance.
Leak-proof design maintains gas integrity over years of operation.
Designed for high endurance over thousands of switching cycles.
Corrosion-resistant materials ensure long-term durability in outdoor installations.
Compact design reduces installation footprint while maintaining accessibility for maintenance.
The LW16-40.5 breaker serves multiple essential functions in outdoor high-voltage networks.
Interrupts overcurrents, short circuits, and overloads.
Protects substation equipment, transformers, and downstream networks.
SF6 insulation ensures rapid arc extinction during current interruption.
Reduces wear on contacts, extending operational lifespan.
Compatible with substation automation systems for remote monitoring and switching.
Enables efficient grid management and fault isolation.
Supports normal load switching and maintenance isolation.
Reduces the risk of unplanned outages and grid instability.
Proper maintenance is critical to ensuring the long-term reliability of the LW16-40.5 circuit breaker.
| Frequency | Inspection Points | Action Required |
|---|---|---|
| Monthly | Visual inspection of housing, terminals, SF6 system | Clean dust, check for cracks, verify SF6 pressure |
| Quarterly | Electrical and mechanical testing | Contact resistance, mechanical operation, lubrication |
| Annually | Comprehensive inspection | Check sealing, inspect arc chamber, recalibrate operating mechanism |
SF6 Gas Monitoring: Check gas pressure regularly; refill only with certified SF6.
Contact Wear: Inspect contacts for pitting or erosion; replace if necessary.
Lubrication: Apply recommended grease to moving components.
Environmental Protection: Keep terminals and housing free from moisture and corrosion.
Record Keeping: Maintain logs of inspections, tests, and repairs.
The LW16-40.5 breaker undergoes rigorous quality control during manufacturing to ensure reliable performance.
Raw Material Inspection: Only certified materials are used for mechanical and electrical components.
Machining and Assembly Inspection: Ensures precise alignment and high-quality soldering/connections.
SF6 Gas Integrity Testing: Leak tests performed on every unit before shipping.
Dielectric Testing: Confirms insulation withstand capacity.
Short-Circuit Testing: Verifies interruption capability at rated fault currents.
Mechanical Endurance: Validates long-term operation reliability.
Complies with IEC 62271 and GB/T 11022 standards.
Factory-tested units come with performance certificates.
To guarantee operational reliability, the LW16-40.5 undergoes multiple performance evaluations.
Insulation Resistance Measurement: Ensures no leakage or breakdown.
Current Carrying Capacity: Verifies continuous operation at rated current.
Short-Circuit Interruption: Confirms fast and safe fault clearing.
Switching Endurance: Simulates thousands of operations to ensure mechanical stability.
Environmental Testing: Validates operation under extreme temperatures, humidity, and UV exposure.
Vibration and Shock Resistance: Confirms durability during transportation and outdoor conditions.
Proper packaging ensures the LW16-40.5 breaker reaches customers safely and without damage.
| Packaging Component | Description |
|---|---|
| Outer Crate | High-strength, moisture-resistant wooden crate |
| Internal Cushioning | Vibration-proof foam padding |
| SF6 Chamber Safety | Factory-sealed, leak-tested |
| Labeling | Product model, voltage rating, handling instructions |
| Export Compliance | Meets ISPM 15 international shipping standards |
Air Freight: Quick delivery for urgent orders.
Sea Freight: Suitable for bulk shipments.
Land Transport: Stabilized with anti-vibration supports.
“LW16-40.5 breakers have significantly improved grid reliability. Their durability and reliable SF6 insulation reduce maintenance frequency and ensure Safe Operation under outdoor conditions.”
“The outdoor SF6 breaker operates flawlessly even under extreme weather conditions. We rely on LW16-40.5 for stable power transmission and operational efficiency.”
“Our solar and wind substation integration uses LW16-40.5 breakers for high-voltage protection. They deliver consistent performance and reduce grid downtime risks.”
High Reliability: Stable operation in outdoor high-voltage applications.
Durable Design: Resistant to corrosion, humidity, and temperature extremes.
Low Maintenance: Minimal inspection and servicing required.
Global Compliance: IEC and GB/T certified.
Comprehensive Support: Full after-sales service and technical guidance.
The LW16-40.5 Outdoor SF6 Circuit Breaker High Voltage Reliable Durable Power Transmission Equipment for Substation Electrical Protection provides premium protection and operational stability in outdoor Power Systems. With robust SF6 insulation, long-term durability, and tested reliability, it is ideal for substations, industrial grids, and renewable energy transmission networks.
Its maintenance-friendly design, rigorous quality control, and global compliance make it a trusted solution for long-term electrical safety and efficiency.
Phone: +8613736779975
E-mail: sales@vcbbreaker.com
Address: 66 Punan Road, Yueqing Economic Development Zone, Zhejiang, China
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