If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.
Skill Level: Noob - You don't need to reference a datasheet, but you will need to know basic power requirements.
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Based on 3 ratings:
Good quality round switch, easy to install due round package and spade connectors (5mm wide ones), no soldering required. There is small notch that must be taken account during installation, but that's good to leave as it is, prevents switch spinning around in hole. Also, 6A/250VAC, not well seen from picture.
A very tactile, stable, and satisfying switch I've used in several projects. However, I've never been able to install this in a 20mm hole without breaking off the bits on the side with a pair of pliers? Is there some trick I'm missing here?
Sorry, I'm not familiar with any tricks. You might size up your hole slightly, though too much and you might end up with a loose fitment. Sorry I don't have any better tips. Happy hacking!
This is a great little AC rated switch - no frills. Easy to put in a box because you just drill a round hole - then cut a little notch in the side of the hole for the key (on the other side of the switch in the photo) with a little file. Be advised, this baby can be a little stiff! But all in all a great value for the price!