The LN2-40.5 Indoor SF6 Circuit Breaker is an indoor device designed for use in 50 Hz three-phase AC systems. It is suitable for industrial enterprises, power plants, and substations for protection and control purposes and can be used in locations requiring frequent operations. It can also be used as a link circuit breaker and for switching capacitor banks.
The LN2-40.5 model is equipped with the CT10-A spring operating mechanism but can also be paired with the CD101G electromagnetic operating mechanism.
No. Parameter Name Unit Parameter Value 1 Rated voltage kV 40.5 2 Maximum working voltage kV 40.5 3 Rated insulation level kV 185 (lightning impulse, full wave) /
95 (power frequency, 1 min)4 Rated frequency Hz 50 5 Rated current A 1250 6 Rated short-circuit breaking current kA 25 7 Rated operating sequence – O—0.35s—CO—180s—CO* 8 Rated short-circuit making current (peak) kA 63 9 Rated dynamic stability current (peak) kA 63 10 Rated thermal stability current kA 25 11 Rated thermal stability duration s 4 12 Switching current for a single capacitor bank A 400 13 Rated out-of-step breaking current kA 6.3 14 Accumulated breaking times (rated current) Times 2000 15 Accumulated breaking times (rated short-circuit) Times 16 16 Mechanical life – With CT10-A spring mechanism Times 6000 – With CD10IIG electromagnetic mechanism Times 5000 17 Closing time – Spring mechanism s ≤0.15 – Electromagnetic mechanism s ≤0.2 18 Inherent opening time (rated voltage) – Minimum operating voltage s ≤0.10 – Maximum operating voltage s ≤0.07 19 SF6 gas rated pressure (20℃ gauge) MPa 0.65 20 SF6 gas alarm pressure (20℃ gauge) MPa 0.42 21 SF6 gas lock pressure (20℃ gauge) MPa 0.4 22 SF6 gas annual leakage rate %/Year ≤1 23 SF6 gas moisture content ppm (V/V) ≤150 24 Rated operating voltage (CT10-A spring mechanism) – Closing coil V (DC) 48, 110, 220 – Opening coil V (DC) 48, 110, 220 – Motor V (DC) 110, 220 25 Rated operating voltage (CD10IIG electromagnetic mechanism) – Closing coil V (DC) 110, 220 – Opening coil V (DC) 48, 110, 220 26 Weight – Circuit breaker body kg 135 – SF6 gas kg 1.5
The LN2-40.5 Indoor SF6 Circuit Breaker High Voltage Reliable Durable Electrical Protection for Switchgear Substation is a high-performance switching device designed to provide safe, efficient, and long-lasting electrical protection in medium- to high-voltage applications. With its advanced SF6 gas insulation, the breaker delivers exceptional arc-quenching ability, mechanical endurance, and operational stability, making it an essential component in modern substations and switchgear systems.
This detailed article explores the product uses, maintenance techniques, packaging information, and customer reviews, helping engineers, purchasing managers, and technical specialists make informed decisions when selecting LN2-40.5 circuit breakers for demanding electrical networks.
The LN2-40.5 SF6 Circuit Breaker is designed for 40.5kV class switchgear applications. It is capable of handling high fault currents, ensuring reliable circuit interruption and protection against overloads, short circuits, and operational surges.
Rated Voltage: 40.5kV
Rated Current: 1250A–2500A (customizable options available)
Insulation Medium: SF6 gas for excellent arc-quenching performance
Applications: Indoor switchgear, substations, industrial and utility Power Systems
Reliability: Tested for long service life and durability under demanding load conditions
| Parameter | Value |
|---|---|
| Product Model | LN2-40.5 Indoor SF6 Circuit Breaker |
| Rated Voltage | 40.5 kV |
| Rated Current | 1250A / 2000A / 2500A |
| Rated Short-Circuit Current | Up to 31.5 kA |
| Frequency | 50/60 Hz |
| Insulation Medium | SF6 Gas |
| Arc Quenching | SF6 Arc Extinguishing Chamber |
| Mechanical Endurance | ≥ 10,000 operations |
| Applications | Switchgear, Substations, Industrial Power Systems |
The LN2-40.5 Indoor SF6 Circuit Breaker is versatile and designed to meet multiple industrial and utility needs.
The breaker provides primary protection in 40.5kV substations, ensuring stability and preventing faults from spreading across the grid.
Heavy industries such as steel plants, oil refineries, and manufacturing facilities rely on LN2-40.5 breakers for continuous operation under high demand.
Utilities use the breaker for grid reinforcement and load management, ensuring safe distribution and minimized downtime.
Large infrastructure projects such as metro systems, airports, and data centers depend on the breaker’s reliable fault-clearing capability.
Proper maintenance of the LN2-40.5 Indoor SF6 Circuit Breaker ensures extended service life and optimal performance.
| Frequency | Inspection Points | Action Required |
|---|---|---|
| Monthly | Visual inspection of housing, terminals, and joints | Clean dust, check for cracks or discoloration |
| Quarterly | Gas pressure levels | Verify SF6 gas levels are within safe limits |
| Annually | Contact resistance measurement | Conduct resistance tests and lubricate moving parts |
| Every 5 Years | Comprehensive overhaul | Replace seals, check arc chamber, recalibrate mechanisms |
SF6 Gas Monitoring: Always monitor SF6 levels; refill only with certified gas.
Lubrication: Apply recommended grease on moving mechanical parts.
Contact Wear Check: Inspect for pitting or erosion due to arc operations.
Electrical Testing: Perform insulation resistance and contact resistance tests regularly.
Record Keeping: Maintain a log of maintenance schedules, test results, and any part replacements.
For global export, the LN2-40.5 Indoor SF6 Circuit Breaker is packaged with safety and protection in mind.
| Packaging Component | Description |
|---|---|
| Outer Packaging | High-strength wooden crate with moisture-proof lining |
| Internal Protection | Foam cushioning and vibration-resistant padding |
| Gas Safety Sealing | SF6 chamber sealed and factory-tested before shipment |
| Labeling | Product model, serial number, voltage rating, and safety instructions |
| Export Compliance | Meets ISPM 15 international shipping standards |
Air Freight: For urgent deliveries, packaged in lightweight protective crates.
Sea Freight: Heavy-duty crating for large-volume orders.
Land Transport: Secured with vibration-resistant fasteners.
“After installing the LN2-40.5 Indoor SF6 Circuit Breaker, our substations have experienced fewer faults and enhanced reliability. The breaker’s durability and arc-quenching performance make it our first choice.”
“The breaker operates flawlessly under continuous heavy load conditions. Maintenance intervals have been reduced, saving significant operational costs.”
“Our solar integration substation required reliable 40.5kV breakers. LN2-40.5 units provided stable protection and efficient switching, even during variable power surges.”
High Reliability: Proven performance in demanding high-voltage environments.
Durable Design: Long service life with robust mechanical endurance.
Safe Operation: Superior SF6 arc-extinguishing properties minimize risks.
Cost-Effective: Reduced maintenance needs lower long-term costs.
Global Standards: Fully compliant with IEC and GB/T regulations.
The LN2-40.5 breaker supports 1250A–2500A, depending on model selection.
Gas levels should be checked quarterly to ensure arc-quenching capability.
Yes, custom designs for high-altitude, humid, or corrosive environments are available.
With proper maintenance, the breaker can operate 15–20 years or more.
The LN2-40.5 Indoor SF6 Circuit Breaker meets global certification requirements:
IEC 62271 – High-voltage switchgear standard
GB/T Standards – National compliance for China power equipment
ISO 9001 – Manufacturing quality management system
The LN2-40.5 Indoor SF6 Circuit Breaker High Voltage Reliable Durable Electrical Protection for Switchgear Substation is a trusted solution for modern power systems. Its robust design, advanced SF6 insulation, and proven durability make it suitable for substations, industrial networks, and critical infrastructure worldwide.
With comprehensive maintenance practices, reliable packaging, and excellent customer feedback, this breaker provides long-term safety, efficiency, and stability—meeting the growing demands of global power distribution.
Phone: +8613736779975
E-mail: sales@vcbbreaker.com
Address: 66 Punan Road, Yueqing Economic Development Zone, Zhejiang, China
Copyright © 2025 Yangmei Electric Group All rights reserved
This website uses cookies to ensure you get the best experience on our website.
Español
Portugues
Pусский
العربية
Türk dili
Indonesia
Tiếng Việt
қазақ
فارسی
українська
беларускі
Filipino
o'zbek
български
тоҷикӣ
kiswahili
Монгол
አማራ
Ilocano
Phone