I. Overview 
The JCZ5 series indoor AC high-voltage vacuum contactors are available in two types: mechanical latching for closing and electromagnetic holding. This contactor is suitable for use in three-phase AC 50Hz power systems with rated voltages up to 12kV and rated currents up to 630A. It is designed for remote connection and disconnection of circuits, controlling high-voltage motors, transformers, capacitive loads, and other electrical equipment. It is particularly suitable for various applications requiring frequent operations. The contactor features a compact size, light weight, and adopts the internationally popular top-bottom arranged modular structure, ensuring ease of use, maintenance, and facilitating integration into F-C loop complete equipment.
II. Environmental Conditions
a) Ambient air temperature: upper limit +40°C, lower limit: -25°C; altitude not exceeding 2000m;
b) Humidity: daily average relative humidity not exceeding 95%, monthly average not exceeding 90%; daily average water vapor pressure not exceeding 2.2kPa, monthly average not exceeding 1.8kPa; the surrounding air should be free from significant pollution by corrosive gases, water vapor, etc.;
c) No frequent severe vibrations; during operation, the installation plane should not be inclined more than 5° from the horizontal;