Motor protection relay helps to restrict the motor burn when there is any blunder in motor that may generate more current than motor capacity is moving or for some reason, more energy is supplied than the designated voltage. In both examples, it prevents the engine from burning.

A programmable logic controller (PLC) is a short, modular hard state computer with customized guidance for performing a particular task. PLCs, which are used in industrial control systems (ICS) for a wide variety of industries, have largely replaced automatic relays, drum sequencers, and cam timers.

Smart relays have further in common with programmable logic controllers (PLCs) than conventional relays. Yet, the term 'smart relay' is used to differentiate them and emphasize the lower price compared with even the smallest of traditional PLCs. People are processed either appropriating pushbuttons and a small screen on the front panel or via a computer.…