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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, or where several circuits must be controlled by one signal.
The theory and application of these protective devices is an important part of the education of an electrical engineer who specializes in power systems. The need to act quickly to protect circuits and equipment as well as the general public often requires protective relays to respond and trip a breaker within a few thousandths of a second. In some instances these clearance times are prescribed in legislation or operating rules. A maintenance or testing program is used to determine the performance and availability of protection systems.
· Equipped with microprocessor
· Fixed / adjustable unbalance settings
· Fixed / adjustable settings for under / over voltage, current & load
· Fixed / adjustable trip delays
· Highly efficient
· Safe in use
· Long service life
· Proximity Sensors
· Motor Protection Relays
· Numerical Protection Relays
· Genset Protection Relays
· PID Controllers
· Transducers and isolators