Indoor Fixed Vacuum Circuit Breaker

At 40.5kV, cabinet space can be limited. Juhui Power Equipment Co., Ltd. manufactures the Indoor Fixed Vacuum Circuit Breaker at its plant in Yueqing, Zhejiang. The company has nine years of experience in high voltage equipment manufacturing. The factory covers 1,500 square meters, with a dedicated research team working on site. Global brand customers have also placed orders with the company. This model is designed for 40.5kV power systems and is used in industrial plants, power plants, and substations. It switches load current, overload current, and fault current. The breaker and operating mechanism are arranged vertically rather than side by side, which helps reduce the overall unit depth. Three separate epoxy resin cylinders surround the arc chambers and live connections, forming an additional insulation path. The structure provides the required air clearance and creepage distance while keeping the unit compact. Production can follow customer drawings, and a single piece is enough to start.

Each cylinder contains a vacuum interrupter together with the fixed and moving conductive connections. The phase-to-phase spacing is 300mm. All main circuit connections are securely bolted to reduce the risk of loosening caused by vibration. A dedicated spring operating mechanism is installed in the lower part of the frame below the cylinders. Its operating characteristics match the requirements of 40.5kV switching duty. The vertical arrangement keeps the structure compact and allows smooth, quick operation. Electrical performance remains stable during operation, and the mechanism is suitable for long-term service. The operating mechanism requires no routine maintenance, which helps reduce service work. The unit is suitable for applications involving frequent switching and demanding operating conditions.

The unit complies with GB1984-2003, GB/T11022-1999, and IEC62271-100. The permissible ambient air temperature is up to 40°C, with a daily average of no more than 35°C. The minimum temperature is -15°C. Daily average relative humidity is no more than 95%, while the monthly average is no more than 90%. Daily average water vapor pressure is no more than 2.2kPa, and the monthly average is no more than 1.8kPa. The installation altitude is below 1,000 meters. The installation site should be free from obvious dust, smoke, corrosive or flammable gases, steam, and salt spray. External vibration and ground movement should not be significant. Secondary circuit electromagnetic interference is no more than 1.6kV. For special conditions, such as an altitude above 1,000 meters, temperatures outside the specified range, or condensation, customized configurations are available.

The Indoor Fixed Vacuum Circuit Breaker uses a reliable insulation cylinder as the main insulating structure. A vacuum interrupter handles arc interruption. A solid-sealing process is available as an option. The standard configuration uses a WL-35855X interrupter, while a coil-type axial magnetic field interrupter is also available as an option. The ceramic shell and copper-chrome contacts provide compact dimensions, high insulation performance, strong arc-extinguishing capability, long electrical life, and reliable short-circuit breaking performance.

The main conductive circuit can also use the solid-sealing process. The interrupter is cast inside the insulation cylinder, increasing the overall insulation strength. The cylinder, interrupter installation, and fixed and moving conductive connections are checked separately during production. Shipment is made only after the required inspections are completed. The structure also provides convenient service access, while the operating mechanism requires no routine maintenance. The unit is suitable for applications with frequent switching. Third-party inspection is welcome, and every unit is checked before packing. The product carries a one-year warranty.

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