I want assembly language program for overcurrent relay which I could compile in proteus...plz send the program as well as how to generate the input current signal logic and simulation model in proteus..
A relay is an electrical switch that turns on or off, based on an external electrical signal. It's like a normal switch we see in our homes. The only difference is that instead of being switched on or switched off by a human being, switching is controlled by an external electrical signal. When the external signal is applied, the relay is turned on and the switch is on, and when the external electrical signal is removed, the relay is deactivated and the switch is off.
There are two types of relays - mechanical, which rely on a coil and solid state. For most hobby work, it will take care of mechanical relays as they are cheap and readily available compared to the solid state relay.
A relay is an electromechanical switch, which carries out ON and OFF operations without any human interaction. The general representation of the double-contact relay is shown in the figure: