LW16-40.5 Outdoor SF6 Circuit Breaker | 40.5kV Medium Voltage Solution
LW16-40.5 Outdoor SF6 Circuit Breaker is designed for reliable switching and protection in 40.5kV medium-voltage power transmission and distribution systems. Using SF6 gas as the insulation and arc-extinguishing medium, it provides excellent breaking performance, stable dielectric strength, and long-term operational reliability. Equipped with a reliable spring operating mechanism and optimized arc-extinguishing technology, the circuit breaker is suitable for outdoor substations, industrial power networks, renewable energy collection systems, and other medium-voltage applications requiring safe and efficient power protection.
Get a QuoteOverview
The LW16-40.5 outdoor SF6 circuit breaker is designed for 40.5kV medium-voltage power transmission and distribution systems, providing reliable switching, fault protection, and safe operation in outdoor environments. With excellent electrical performance, low maintenance requirements, and long service life, it is suitable for substations, industrial power networks, mining facilities, and other demanding distribution applications.
The circuit breaker adopts SF6 gas as the insulation and arc-extinguishing medium, utilizing its excellent dielectric strength and arc-quenching capability to ensure reliable interruption performance. Equipped with a CTB-1 spring operating mechanism, the LW16-40.5 provides stable mechanical operation and high endurance, with a mechanical life of more than 10,000 operations.
Features
Advanced Arc-Extinguishing Technology
The LW16-40.5 features a thermal expansion combined with gas-blast arc-extinguishing system. During the interruption process, the generated gas flow effectively cools and extinguishes the arc, enabling rapid contact separation, reducing arc duration, and minimizing electrical stress on the equipment.
With its sealed SF6 insulation structure, optimized operating mechanism, and reliable switching performance, the LW16-40.5 ensures long-term and stable operation in outdoor power systems.
Typical Applications
The LW16-40.5 outdoor SF6 circuit breaker is widely used in 40.5kV medium-voltage power transmission and distribution systems, providing reliable switching and protection solutions for various outdoor electrical installations.
It is suitable for medium-voltage outdoor substations, renewable energy collection systems including wind power and photovoltaic projects, and utility distribution networks. The circuit breaker can also be applied in industrial power systems such as mining, petrochemical, and other heavy-load facilities where stable fault interruption and reliable operation are required.
With its strong environmental adaptability and low maintenance characteristics, the LW16-40.5 is also suitable for remote rural electrification projects and areas with limited maintenance conditions, ensuring continuous and safe power supply.
Technical Data
| Item | Unit | Parameter |
| Rated Voltage | kV | 40.5 |
| Rated Current | A | 1600 / 2000 / 2500 |
| Rated Frequence | Hz | 50 |
| Rated Short-Circuit Breaking Current | kA | 31.5/40(some models support 50) |
| Rated Short-Circuit Duration | s | 3 |
| Rated Lightning Impulse Withstand Voltage | kV | 185(to ground) / 215(fracture) |
| Rated 1-Minute Power Frequency Withstand Voltage | 95(to ground) / 110(fracture) | |
| Rated SF6 Gas Pressure (at 20℃, Gauge Pressure) | MPa | 0.4-0.45 |
| Operating Energy (Spring Mechanism) | J | 800-1000 |
| Mechanical Life | Times | ≥5000 |
| Current for Making/Breaking Capacitor Banks | A | 500-630 |
| Annual Gas Leakage Rate | % | ≤0.3 |
Overall and mounting dimensions(mm)
Typical Project Applications
The LW16-40.5 outdoor SF6 circuit breaker has been widely applied in medium-voltage power distribution projects where high reliability, stable insulation performance, and low maintenance operation are required.
Utility Substation Modernization
In power grid upgrading projects, the LW16-40.5 can be used to replace traditional switching equipment, improving fault interruption capability, reducing maintenance requirements, and enhancing the overall reliability of outdoor substations.
Industrial Power Distribution Systems
For industries such as mining, metallurgy, and chemical processing, the circuit breaker provides reliable protection against short-circuit faults and load switching events. Its sealed SF6 insulation structure enables stable operation under harsh environmental conditions, including dust, wind, and temperature variations.
Renewable Energy Collection Systems
The LW16-40.5 is suitable for wind power and photovoltaic collection stations, supporting reliable switching and protection between renewable energy generation units and the power grid. Its fast interruption capability helps improve grid connection safety and operational stability.
Installation and Commissioning Guidelines
The LW16-40.5 SF6 circuit breaker should be installed on a suitable concrete foundation or steel support structure according to the installation requirements.
During installation, the following procedures should be completed:
- Secure the circuit breaker firmly to the foundation and verify mechanical alignment.
- Connect incoming and outgoing conductors using appropriate terminals and ensure reliable electrical contact.
- Check SF6 gas pressure and verify the accuracy of the density monitoring system before operation.
- Complete wiring of the CTB-1 spring operating mechanism and test local/remote control functions.
- Perform mechanical opening and closing tests, insulation checks, and necessary commissioning tests before energizing the equipment.
Proper installation and commissioning ensure reliable operation, extend service life, and maintain the designed electrical and mechanical performance of the circuit breaker.
