JCZ7-12 series AC Vacuum Contactor 3 polesis suitable for the AC electric system, of which the frequency is 50~60 Hz, rated working voltage of 12 kV (or 7.2 kV), for direct or remote on-off control of the main circuits.
This series of vacuum contactors main used below the rated current from 160A-630A power network systems for remote making and breaking and frequent starting and control of AC motors, transformers and capacitor banks and other occasions.
WORKING CONDITIONS
1) Ambient temperature:
- Maximum ambient air temperature not exceeds ＋40℃;
- averaged air temperature within 24 hours not exceeds ＋35℃;
- minimum ambient temperature to be not lower than -15℃.
2) Altitude above sea level: altitude above sea level of the installation place not exceeds 1,000 m.
3) Relative humidity: relative humidity of the atmospheric air not exceeds 50% when the ambient air temperature is ＋40℃; higher relative humidity is allowed when the air temperature is lower, daily averaged relative humidity not exceeds 95%; maximum monthly averaged relative humidity is 90% when the averaged air temperature is ＋20℃in most humid months. Having taken into account the condensation dew on the surface of the product due to the temperature variation.
4) Working conditions: the places where are without the invasion of rain or snow, without open fire and explosive danger, without chemical corrosions and strong vibration.
WORKING PRINCIPLES
The high voltage main circuit and low voltage control circuit are arranged in upper and lower sections. This arrangement mode looks apparently, safe, reliable and convenient for installing and maintaining. The moving current-conducting rod of three-phase vacuum arc-extinguishing chamber is connected with the connecting lever by means of three insulators; the connecting lever and the moving armature is fixed/secured on the square axle. For the electric holding type, attracting and releasing of the armature by the electro-magnetic coil drives the making and breaking process of the moving contacts in the vacuum switch tube. As making/breaking process of the contacts is carried out in the vacuum space, therefore, it has excellent switching characteristics, with long lifetime, both safe and reliable. Its control circuits provide the rectifying equipment and the changeover of picking up and holding of the electro-magnetic coil. It also provides the auxiliary switch of 3a＋2b for the user.
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