Indoor Vacuum Circuit Breaker--ZN85-40.5

Product description

The ZN85 - 40.5 indoor high - voltage vacuum circuit breaker is suitable for three - phase AC 50Hz power systems with a rated voltage of 40.5kV. It can be used as a protection and control device in industrial and mining enterprises, power plants, and substations, and is suitable for occasions with frequent operations.

Product parameters

• Rated voltage: 40.5kV
• Rated frequency: 50Hz
• Rated current: Specifications such as 1250A, 1600A, and 2000A are available.
• Rated insulation level: 1 - minute power - frequency withstand voltage is 95kV; lightning impulse withstand voltage (peak value) is 185kV.
• Rated short - circuit breaking current: Values such as 20kA, 25kA, and 31.5kA are available.
• Rated short - circuit making current (peak value): Values such as 50kA, 63kA, and 80kA are available.
• Rated peak withstand current: Values such as 50kA, 63kA, and 80kA are available.
• Rated short - time withstand current: Values such as 20kA, 25kA, and 31.5kA are available, with a rated short - circuit duration of 4s.
• Rated operating sequence: Open - 0.3s - Close and open - 180s - Close and open
• Breaking time: ≤80ms
• Rated short - circuit breaking current breaking times: Generally 20 times.
• Mechanical life: 10,000 times or more.
• Single - capacitor - bank breaking current: 630A
• Back - to - back capacitor - bank breaking current: 400A

Product features

• Compact structure3: It adopts an integrated and modular design with an upper - lower arrangement. The arc - extinguishing chamber is on the upper part, and the interlocking and operating parts are on the lower part. The overall structure is simple and reasonable, effectively reducing the depth of the circuit breaker.
• Good insulation performance3: The three - phase conductive circuit's vacuum arc - extinguishing chambers are arranged in a closed insulation cylinder made of reliable electromechanical materials through a mature vacuum casting process. This not only significantly improves the insulation performance between phases but also isolates each phase circuit from the harsh external environment, preventing dust and foreign objects from entering the main circuit and reducing the overall size of the circuit breaker.
• Strong arc - extinguishing ability1: It uses a vacuum arc - extinguishing chamber with a ceramic shell and copper - chromium contact material. It has the advantages of a small size, high insulation level, strong arc - extinguishing ability, long electrical life, and excellent performance in breaking and closing short - circuit currents.
• Reliable operation1: The special spring - air operating mechanism is used, which requires no adjustment and has stable and reliable actions. The mechanical life can reach 10,000 times or more, and it can meet the requirements of frequent operations.
• Easy maintenance3: The mechanism is maintenance - free, reducing the maintenance cost and workload. Users only need to regularly clean the dust on the surface of the insulating parts and check the vacuum degree of the vacuum arc - extinguishing chamber by the power - frequency withstand voltage method.
• High - degree of intelligence3: It can be equipped with intelligent control equipment to achieve remote operation, monitoring, and protection functions, improving the automation level of the power system.