vaakumkontaktorid

A vacuum contactor is an electrical switch that uses a vacuum interrupter as its arc extinguishing medium. These devices are designed to handle high-voltage and high-current switching operations, particularly in applications where frequent switching or demanding conditions are present. The vacuum interrupter consists of two electrical contacts enclosed in a sealed vacuum-tight envelope. When the contacts are opened, the arc that forms between them is rapidly extinguished due to the absence of gas molecules in the vacuum. This rapid arc extinction is a key advantage of vacuum contactors, as it minimizes contact erosion and prolongs the lifespan of the device. Vacuum contactors are commonly used in medium-voltage power systems, such as motor control circuits, capacitor banks, and power distribution networks. They offer a reliable and durable solution for switching inductive and capacitive loads. Their compact size and low maintenance requirements also contribute to their popularity. The operating principle involves an electromagnet or a pneumatic actuator that drives the movement of the contacts within the vacuum interrupter. The design of the contacts and the internal structure of the vacuum interrupter are crucial for achieving effective arc quenching and preventing restrikes.