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About Relays

Relays and contactors are devices used to switch or interrupt the flow of electrical current in one or more circuits, using a control signal which is galvanically isolated from the circuit(s) being controlled, with various sub-groups demarcated along lines of device construction or intended application. Traditionally and still-commonly based on the use of an electromagnet to open or close a set of mechanical switch contacts, newer devices using solid-state technologies are also widely available, with both types having characteristics to recommend them under different application conditions.

Image of Relay, SPDT schematic symbol Image of Relay, DPST schematic symbol Image of Relay, DPDT schematic symbol Image of Relay, SPST schematic symbol