I love these lighted rocker switches! You definitely want a 5-pin switch instead of a 3-pin switch. Basically, I see the difference that the 3-pin lights up when the device is on, while the 5-pin has an on backlight. When pin 5 is on, another light will illuminate below the image. It makes sense to me to use a backlit plug if you're using lights. If you're using a 3-pin switch, you'll have to look for the switch in the dark. Oh, make sure you use a relay when starting something with a significant draw.
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