Electromechanical Relay

 Electromechanical relay are the high power switching device. Electromechancal relays are widely used in various application in industry.  Electromechanical relay contain electronics part for switching between input and output. They are widely used in medical, military and industrial application. 

Sugar cube Relay

The Relay generally refers to a device that provides an electrical connection between two or more points in response to the application of a control signal. The most widely used type of relay is the Electromechanical Relay or EMR.

Relays are fundamentally electrically operated switches that come in many shapes, sizes and power ratings suitable for all types of applications. Such relays are used in general electrical and electronic control or switching circuits either mounted directly onto PCB boards or mounted on Panel with/ without base.

Electromechanical Relays are Electro-Magnetic devices that convert a magnetic flux produced by the applying an electrical control signal (AC /DC current), forcing mechanical contacts to move within relay. Basically electromechanical relay consists of an energizing coil called the "Primary Circuit" wound around a permeable iron core. It has both a fixed portion called the Yoke, and a movable spring loaded part called the Armature, that completes the magnetic field circuit by closing the air gap between the fixed electrical coil and the movable armature. This armature is pivoted and is free to move within the generated magnetic field closing the electrical contacts that are attached to it. Connected between the yoke and armature is normally a spring (or springs) for the return stroke to "Reset" the contacts back to their initial rest position when the relay coil is in the "de-energized" condition, i.e. Turned "OFF".

Relay Contact Configuration 

As well as the standard descriptions of Normally Open, (NO) and Normally Closed, (NC) used to describe how the relays contacts are connected, relay contact arrangements can also be classed by their actions. Electromechanical relays are made up of one or more individual switches with each "switch" being referred to as a Pole. Each one of these switches or poles can be connected or "thrown" together by energizing the relays coil and this gives rise to the description of the contact types as:

Applications

Relays are used in almost all products and applications. Applications can be categorized under following relay categories.

 Telecommunication

Fax machine, Telephone, Cordless phone, Server, Modem, Office machine, Security system, telecommunications products, card readers, Medical Instruments, Flight Simulator, sensor controls, Data loggers.

 Automotive

Power windows, Seat Adjustment, Doors locking system, Alarm system, Wiper control, Car Control Box, Lamp control system Central locking system, Power sunroof, Power antenna, Air conditioning, Car flasher, Gas conversion kit, Anti-locking brake system, Car Air conditioner and Security system.

 Industrial Control

Control panels, Industrial automation, Robotics, Industrial Interface Network, Data logger, Thermal control Application, Temperature controller, Testing instruments, PLC, Factory automation, Industrial control units , Actuating driver, Heating Control, Industrial appliances, Industrial ventilating and conditioning system, Vending machine.

General Control

UPS, inverter, Vending machine, Timer and controller, card reader, Power supplies, 1phase & 3 phase synchronizer / compensator, Air Conditioner, Controlling equipment, Relay Modules, Attendance Machine, biometrics, office Automation, General control, Measuring instruments, Lamp control, General power and switching, Remote control.

How relay works ?