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Signal relays are a type of electrically operated mechanical switch. They are operated by electrical impulses with the primary function to open and close a circuit. Relays can also be referred to as industrial switches. There are 2 main types of relay category available, latching and non–latching relays.
Relays are used within PCBs for switching purposes. Signal relays are designed for low currents and low voltages. They can be used for up to 2A switching. Power relays are another type of relay which is suitable for high currents and voltages.
Both types of relays in similar in design and function, however, a significant difference between them is that a latching relay will remain in the last position it when it was last powered, whereas a non-latching goes back to its normal position. This makes each more type of relay suitable for different applications.
When choosing a relay, it is important to consider a number of specifications to ensure it is fit for purpose, some factors include:
