Medium Voltage Vacuum Contactor

Medium voltage is used for the economical and efficient transmission of large amounts of power. According to electrical principles, for a given amount of power transmitted, higher voltage results in lower required current. Reducing the current significantly cuts energy loss on the lines (loss is proportional to the square of the current) and allows for the use of thinner conductors, thereby saving substantial materials and costs. Therefore, high voltage levels are essential in high-power applications such as power systems and large-scale industries.

These medium voltage vacuum contactors are primarily used in scenarios requiring the control and protection of high-power equipment. They serve as core switching components in power systems (e.g., motor control, capacitor switching), heavy industries (e.g., large machinery in mining and metallurgy), and critical infrastructure (e.g., traction power supply for rail transit), ensuring safe and reliable operation at voltages ranging from several kilovolts to tens of kilovolts.

Conclusion:​ At 7.2kV and above, air contactors are completely incapable​ of handling the arc quenching task. While SF6 technology is viable, its environmental drawbacks are leading to its gradual replacement by vacuum technology. Vacuum technology, with its superior arc quenching, high safety, compact size, and maintenance-free operation, has become the undisputed mainstream choice for medium and high-voltage switching apparatus.