Circuit Diagram Relay Switch. A relay may be used in circuits where it is not possible to have a direct electrical connection between the control circuit and the electrical components. We strongly suggest developing software with v disconnected.
Ac supply relay switch circuit diagram. Relay terminology the iso mini relay we have looked at above has 4 pins or terminals on the body and is referred to as a make break relay because there is one high current circuit and a contact that is either open or closed depending upon whether the relay is at rest or energised. It take a relatively small amount of power to operate the coil but this itself can be used to control motors heaters lamps or ac circuits which themselves can draw a lot more electrical power.
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There are 2 types of 4 pin relay available. Relay switch pin diagram. Basic schematic circuit diagram of relay the following schematic shows the basic circuit. The magnetic coil is connected between bias through switching transistor.