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Test Structures for Benchmarking the Electrostatic
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... Organization of this handbook This manual contains instructions on the operations to be performed on EMAX circuit-breakers E2.2E4.2-E6.2 throughout their life cycle, from reception to installation, and from commissioning to subsequent maintenance during operation, with particular attention to the en ...
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... the act that more and more of the generated voltage is required to force the increasing current through the windings of the armature; i.e., the armature IR drop increases. This leaves a smaller part of the total emf for brush emf, and when the brush voltage falls, there is a slight decrease in the f ...
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Relay



A relay is an electrically operated switch. Many relays use an electromagnet to mechanically operate a switch, but other operating principles are also used, such as solid-state relays. Relays are used where it is necessary to control a circuit by a low-power signal (with complete electrical isolation between control and controlled circuits), or where several circuits must be controlled by one signal. The first relays were used in long distance telegraph circuits as amplifiers: they repeated the signal coming in from one circuit and re-transmitted it on another circuit. Relays were used extensively in telephone exchanges and early computers to perform logical operations.A type of relay that can handle the high power required to directly control an electric motor or other loads is called a contactor. Solid-state relays control power circuits with no moving parts, instead using a semiconductor device to perform switching. Relays with calibrated operating characteristics and sometimes multiple operating coils are used to protect electrical circuits from overload or faults; in modern electric power systems these functions are performed by digital instruments still called ""protective relays"".
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