Vacuum contactor is one of the most commonly used types of contactor, widely used in coal mine, electric power, metallurgy, textile. High-rise buildings and other various industry sectors. The vacuum contactor is mainly composed of the vacuum interrupter chamber and the operating mechanism. Have the users understood the specific composition knowledge? The following Xiaobian will specifically introduce the composition of the vacuum contactor.
summarize
Low voltage vacuum AC contactor is suitable for AC: 50HZ, rated voltage: 1140V, rated current 63 to 630A feed network, for long-distance connecting and disconnecting circuit, as well as frequent start and stop AC motor. It is especially suitable for assembling flameproof electromagnetic starter with various protective devices.
Make up
The vacuum contactor is mainly composed of a vacuum interrupter chamber and an operating mechanism. The vacuum arc extinguishing chamber has two functions of reliable arc extinguishing through normal working current and frequent cutting off working current. But can not cut off the overload current and short circuit current. The operating mechanism is composed of a holding coil with an iron core and an armature. The coil is energized, the armature is attracted, and the contactor is closed. The coil is out of power and the contactor is disconnected. The holding coil generally has two forms, DC and AC.
The shell of the vacuum interrupter is made of glass or ceramic insulation material, and the internal vacuum degree is usually above 0.01Pa. Because there is less air in the shell, the opening distance of the contact can be made very small, and the arc is easier to be extinguished. Contact materials are generally made of copper, antimony, osmium and other alloys. The function of the shielding cover in the arc extinguishing room is that when the current is broken, the metal steam diffused in the gap of the contact is condensed, which helps to extinguishes the arc, and can also prevent the metal steam from sputtering onto the insulation shell to reduce its insulation strength. The moving contact is connected with the lower end of the shell with a corrugated pipe, and the moving contact can move up and down without air leakage.
