Indoor Withdrawable Vacuum Circuit Breaker

A 40.5kV indoor breaker can be installed on a withdrawable cart instead of being fixed in place. Juhui Power Equipment Co., Ltd. manufactures the Indoor Withdrawable Vacuum Circuit Breaker at its plant in Yueqing, Zhejiang. The factory covers 1,500 square meters and has been operating for nine years. The company has an engineering team with field experience and has supplied global brand customers. Model ZN85C-40.5/T2000-31.5 is designed for three-phase AC 50Hz systems at 40.5kV. It is used in industrial plants, power plants, and substations. Load current, overload current, and fault current pass through the main contacts. The breaker and operating mechanism are arranged vertically, which helps reduce the cabinet depth. Production can follow customer drawings. Trial orders can start from one set.

Three separate epoxy resin barriers 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 overall unit compact. Each barrier contains a vacuum interrupter and 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 inside the lower frame. Its operating characteristics match the requirements of 40.5kV switching duty. The vertical arrangement keeps the structure compact while allowing smooth and quick operation. Electrical performance remains stable during operation, and the mechanism is suitable for long-term service. The operating mechanism requires no routine maintenance, helping reduce service work. The unit is suitable for applications with frequent switching and demanding operating conditions. Production can follow customer samples, and a single piece is enough to start.

This Indoor Withdrawable Vacuum Circuit Breaker has a rated voltage of 40.5kV and a rated frequency of 50Hz. The 1-minute power frequency withstand voltage is 95kV, and the peak lightning impulse withstand voltage is 185kV. Rated current options are 1250A, 1600A, and 2000A. The 4-second short-time withstand current is 25kA or 31.5kA, while the peak withstand current is 63kA or 80kA. Short-circuit breaking current is 25kA or 31.5kA, and short-circuit making current is 63kA or 80kA.

The rated operating sequence is 0-0.3s-CO-180s-CO. Short-circuit breaking capacity allows 20 operations, and the capacitor bank breaking current is 630A. Mechanical endurance reaches 10,000 operations. The cart structure matches the corresponding handcart cabinet. It is suitable for applications requiring frequent switching and operation under demanding conditions. Before ordering, confirm the cabinet model, cart dimensions, and secondary plug. Third-party inspection is welcome. Every unit is fully tested before shipment, and the product carries a one-year warranty.

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