Zhejiang Donghua Electrical Appliance Co., Ltd.
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ZN85‑40.5 Indoor High‑Voltage AC Vacuum Circuit Breaker

The ZN85‑40.5(3AV3) indoor vacuum circuit breaker is jointly designed and manufactured by our company and Xi’an High‑Voltage Apparatus Research Institute. It is indoor high‑voltage equipment rated at 40.5 kV, three‑phase AC 50 Hz. It is used for control and protection of electrical equipment in industrial & mining enterprises, power plants and substations, and suitable for applications requiring frequent operations.

    Features

    ‑ The circuit breaker adopts an overall layout with vacuum interrupter on the top and operating mechanism at the bottom, convenient for commissioning. ‑ Adopts air‑solid composite insulation, featuring compact design and light weight. ‑ Compatible with vacuum interrupters from Cutler‑Hammer and domestic ZMD vacuum interrupters. Both types employ axial‑magnetic‑field arc‑extinguishing technology, with low chopping current and excellent asymmetrical breaking performance. ‑ Simple spring operating mechanism, with mechanical endurance of 10,000 operations. ‑ Lead‑screw driving mechanism, with good efficiency, balance and self‑locking performance.