A general-purpose relay is a type of switch that is activated by an electrical current to control the operation of another electrical circuit. The basic function of a relay is to isolate different parts of a system, preventing high currents from directly affecting sensitive components. A general-purpose relay consists of an electromagnet, a set of contacts, and a spring mechanism. When current flows through the coil of the electromagnet, it generates a magnetic field that causes the contacts to open or close, depending on the design of the relay.

    GPRs are widely used due to their ability to handle different types of electrical loads, ranging from simple ON/OFF operations to more complex switching functions. These relays come in various forms, including electromechanical and solid-state relays, each suitable for different applications and environments.