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High voltage relay

A high voltage relay is used to operate at high voltages. Relays are used in a number of different applications, such as instrumentation systems and process control. Relays may be electromechanical, electrical, or electronic in nature. Electromechanical switching relays operates by passing a current through a wire wound coil to create a magnetic field which is used to close the relay. Thus, relays act as electromechanical switches. The relay is opened and/or closed by energizing an electromagnet to either attract or repel a metal contact on a movable strip of metal. Electromechanical relays are the standard means for switching high frequency signals. Compared with over solid-state relays, electromechanical relays have the lower ON resistance (when the relay contacts are closed) and higher isolation (when the contacts are open) at high frequencies. However, electromechanical relays are large, noisy, require relatively large power to operate, and are slow to operate. Advances in solid state switching technology have made possible the replacement of many electromechanical switching and relay assemblies. Solid state devices provide the power control systems in which they are incorporated with long life, quiet operation and other associated advantages.

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