Electromagnetic Relay . Electromagnetic relays uses an electromagnet to operate a switching mechanism mechanically. Electromagnetic Relay. Modern electrical protection relays are mainly micro processor based, but still electromagnetic relay holds its place. Electromagnetic Attraction: Current through a coil with an iron core produces a magnetic attraction. It will take much longer time to be replaced the all electromagnetic relays by micro processor based static relays. The data is given in chart form similar to Figure 2. Electromagnetic Attraction type relay Electromagnetic attraction relays can be actuated by both AC & DC quantities. The maximum switching capacity of EMRs substantially derates with regard to maximum voltage or current capabilities. The movement of this contact is generated using electromagnetic forces from the low-power input signal, allowing the completion of the circuit that contains the high-power signal. Relay Internal Diagram. In addition, relay users apply derating beyond the recommendations of the manufacturer in an effort to extend the contact life of the relay. Modern electrical protection relays are mainly micro processor based, but still electromagnetic relay holds its place. Electromagnetic Induction: Relies on the reaction between two magnetic fields to apply a torque on a movable disc or cup that allows rotation and hence closing of contacts. It also provides isolation between low power circuit and high power circuits. The advantage and disadvantages of Magnetic Latching Relay Pulished on Aug. 03, 2020 Magnetic Latching Relay is developed in recent years, and it is also a new type automatic switch.Like other electromagnetic relays, it has the functions of automatically switched on and cutting off. The main part of a relay is the electromagnet. Electromechanical Relay (EMR) An electromechanical relay uses a physical moving part to connect contacts within the output component of the relay. Electromagnetic relays are those relays which are operated by electromagnetic action. A solid-state relay is less-commonly referred to by its acronym, SSR.It is sometimes regarded as an optocoupler, but in this encyclopedia the two components have separate entries.An optocoupler is a relatively simple device consisting of a light source (usually an LED) and a light sensor, in one package.It is used primarily for isolation rather than to switch a high current. solid-state relay . When discussing the advantages and disadvantages of MP device, they often do this in comparison with electromechanical protection devices (EM device). It can be operated by the movement of a piece of iron (electromagnet) when it is attracted by the magnetic field produced by a coil or a plunger being drawn into a solenoid. A motor overload relay consists of a current-sensing unit and a mechanical activated by the sensing unit that Opens the motor circuit If a low voltage and high voltage cables must be placed in parallel runs, they should be separated by at least 6" in order to protect low Volt. Disadvantages or demerits: High burden level instrument transformers are required (CTs and PTs of high burden is required for operating the electromagnetic relays compared to static relays) The directional feature is absent in electromagnetic relays; Requires periodic maintenance and … This is probably due to the fact that so far the overwhelming number of relay protection and automation devices in operation at Russian energy facilities is precisely EM relay protection. provided in the relay data sheet. It will take much longer time to replace all electromagnetic relays by micro processor based static relays. The construction and working of a relay can be understood from the above diagram. 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