Using a SSR for power switching

Using Arduino Motors, Mechanics, Power and CNC
1

I am considering using a SSR to control the output from an SMPS, however I do not know how to use one.
Regarding the picture below, am I right to assume that applying voltage to pin 1 turns on the relay, with 2 returned to ground. Additionally, am I right to assume that pin 3 is connected to the output of the SMPS, with 4 connected to the input of my circuit?

Additionally, regarding switching of the relay, can I simply just connect a switch between the SMPS output and pin 1 to switch the load on and off?

Help would be appreciated.

(This is intended for switching DC loads up to 1.5A at 12V).

relay
relay745×380 10.8 KB

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With the assumption that your SMPS means Switch Mode Power Supply, then yes to all the questions.
The input to a SSR, DC or AC, is a LED that is turned on or off to control the relay. The output on a DC relay is a MOSFET to turn the second circuit on or off.

1 Like
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Thank you for the response. Do I need a resistor in series at pin 1 to limit how much current flows into the switch? If so, how big?

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It depends on the exact part number you are using.some types do need one but with most you do not. Look at the data sheet of the part you have.

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