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Relays are electromechanical devices, which permit a small amount of current to control a much larger amount of current. They generally contain a coil and set of contacts. Their spectrum applications include electric vehicles and rapid transit, undersea cable branching systems, scientific & test equ ipment, silicon wafer processing equipment, oil well "Downhole" applications, battery backup and UPS systems. High voltage relays transfer power in high voltage, in medical equipment such as defibrillators, in aerospace applications, like high frequency antenna couplers and radar and in commercial applications like electric vehicles and rapid transit. Electromechanical relays have applications in automated test equipment (ATE). Reed relays and solid state relays have applications in matrix and multiplexes modules. Time delay relays and solid-state timers include input controls and displays. Output specifications include the switch type, number of contacts, contact configuration, and pole and throw specifications. Various types of relays available are alternating voltage relays, control relays, electromechanical relays, reed relays, mercury relays, monitoring relays, motor starter control, overload relays, power relays, pneumatic relays, timer controls etc. A wide range of relays is manufactured by a host of manufacturers.
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