LW36-40.5 Outdoor High Voltage AC SF6 Circuit Breaker – Technical Description The LW36-40.5 is a high-voltage alternating current (AC) circuit breaker designed for outdoor applications in electrical power systems. Rated at 40.5 kV, it utilizes sulfur hexafluoride (SF6) gas as the primary insulating and arc-quenching medium, ensuring reliable performance under demanding conditions. This circuit breaker is engineered to protect and control high-voltage networks, offering superior interrupting capability, mechanical endurance, and environmental resilience. Design and Construction The LW36-40.5 features a three-phase, single-pole operated design with a robust, weatherproof enclosure suitable for outdoor installation. The breaker’s housing is constructed from corrosion-resistant materials, ensuring long-term durability in harsh environments. The SF6 gas insulation provides excellent dielectric strength, enabling compact dimensions while maintaining high electrical performance. The breaker employs a spring-operated mechanism for rapid and reliable switching operations. Its modular design simplifies maintenance, with accessible components for inspection and servicing. The arc-extinguishing chamber is optimized for efficient interruption of high fault currents, minimizing contact erosion and extending operational life. Key Features - Rated Voltage: 40.5 kV - Rated Current: Up to 2500 A (depending on configuration) - Short-Circuit Breaking Capacity: Typically 25 kA or higher - SF6 Gas Pressure Monitoring: Integrated gas density sensors for real-time status indication - Mechanical Endurance: Over 10,000 mechanical operations - Operating Mechanism: Spring-assisted, motor-charged for quick, low-energy operation - Environmental Compliance: Sealed SF6 gas system with minimal leakage, meeting international standards Operational Performance The LW36-40.5 ensures fast and reliable fault clearance, with a total breaking time of less than 60 milliseconds. Its auto-reclosing capability enhances grid stability by enabling temporary fault recovery. The breaker is compatible with remote monitoring and control systems, supporting integration into smart grid infrastructures. Applications This circuit breaker is widely used in: - Substations (transmission and distribution networks) - Renewable energy plants (wind, solar) - Industrial power systems - Railway electrification Advantages - High reliability with minimal maintenance requirements - Compact and lightweight compared to oil or vacuum breakers - Eco-friendly design with controlled SF6 gas handling - Adaptability to diverse climatic conditions (-30°C to +40°C) Conclusion The LW36-40.5 Outdoor SF6 Circuit Breaker is a high-performance solution for modern high-voltage networks, combining advanced arc-quenching technology, robust construction, and operational efficiency. Its design prioritizes safety, longevity, and environmental sustainability, making it a preferred choice for utility and industrial applications worldwide.