Crompton Vacuum Contactor MVC400 3Pole

A “Vacuum Contactor” is a “switching device” which makes and breaks the current in a chamber known as the “Vacuum Interrupter Tube” (VI). A breaking arc is formed between the fixed and moving contacts of the VI. At current zero the arc extinguishes and the circuit voltage is isolated internally by the rapid build up of dielectric strength between the fixed and moving contacts. The special contact material used in the VI ensures low chopping current and low switching over voltage thereby enhancing the life of the connected load (viz. motors, transformers, capacitors etc).