A vacuum relay is an electrical switch that operates inside a vacuum chamber. The vacuum prevents electric arcs from forming when the relay switches on or off, allowing it to handle high voltages more effectively and with less wear on its contacts. This also enables the relay to switch faster than relays in air. Vacuum relays are durable, compact, and operate quietly. They are typically used in applications that require rapid switching and control of high voltage circuits, such as in radio frequency transmission and power distribution systems.

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