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Why use a relay and not a switch?
While a relay does add an extra step to the switching process, the main advantage is that you can leave the actual switching of high-power circuits for things like off-road lights or air compressors in the engine compartment, and control that switching with a much smaller amperage circuit that energizes the relay’s …
Where are SPST switches used?
The SPST is a basic ON/OFF switch, that is used to connect or break the connection between two terminals. The power supply for the owl circuit is given by this switch. A simple PST switch is shown below. The application of SPST switch is light switch given below and it is also called as a toggle switch.
Is there an alternative to an electromechanical relay?
A solid state relay (SSR) is an alternative, but SSR modules tend to be expensive. For low currents (~1A) there are affordable SSRs, however, this one costs USD 1.38. An SSR for minimum 5A will already cost you three times as much, so there the electromechanical relay is pretty much the cheapest solution.
Is there an alternative to a 5A relay?
This can switch 5A @ 250V AC, but you may have to derate it if your load is reactive (capacitive or inductive). A solid state relay (SSR) is an alternative, but SSR modules tend to be expensive. For low currents (~1A) there are affordable SSRs, however, this one costs USD 1.38.
Which is the most common solid state relay?
Keep in mind that for both electromechanical and solid state relays a few extra components are required, but they won’t cost that much. By far, the most common silicon device to drive AC loads connected to mains voltage is the triac, according to ST app note AN3169,
Do you need a multi stage driver for a microcontroller relay?
For the higher currents you may need to have a multi-stage driver which uses a small BJT to switch the larger MOSFET, and of course there may be heatsinking needed. Unless you really need galvanic isolation I wouldn’t bother with relays (solid state or otherwise) and optocouplers and such.