Though the main electromechanical design having a coil is still used in very large quantities, other varieties have also been developed as the requirements demand more & more compactness & less and less current consumption. They are also small in size, widely used in small miniature relay Manufacturerscurrent applications. This has necessitated the development of DC relays having small footprint, capable of switching high current & able to withstand high temperature and vibration.Reed Relays - Reed relay also have coil as other relay but instead of a spring mechanism, the coil is wounded around a reed switch.
Read switch consists of two small contacts sealed in a small glass tube. For USB relay board & other electronic kits please visit www. They are mainly used in latest vehicles. They are relatively bulky but are extensively used for high power controlling situations. They not only provide high degree of isolation between controlling signal & controlled power but also can be operated at high frequency to finely tuned regulation of high power. Though they are the earlier versions of Relays, they are still used for their ruggedness. Relay types can be broadly categorized as follows- 1. This is mainly made up using electronic components like Optocouplers & Triacs.
These relays have small output current capability.They are also used to operate their AC counterparts this way a small relay can be used to control very high power.Photo relays- This relay is using Light Emitting Diode (LED), to transmit the input signal through transparent barrier, which triggers the Triac as final output.
They are relatively small in size & use less current to operate.com. This kind of relay is able to operate at a speed of hundreds of times in a second but can switch only small amount of current (around 500 mA). This is called Solid State Relay. But some situations like temperature controlling demand power to be switched at high speed. Telecom relays - This kind of DC relays are very small in size, operate with relatively low currents and switches low power. 4.AC relays- These relays are operated through use of AC voltage & current. We have to select the required relay as per our requirement and the design needs. 2.