Wiring illuminated switches

[Slocumotion]

I have 3 new switches to wire in. They are latching push-buttons with an illuminated ring around the button. I was hoping for instructions but not so, neither on the ebay listing nor in the bag when they came. I have asked the seller but no reply yet.

Contacts are labelled:-

+

C NO NC

_

I can find continuity only between NO and NC when the button is out, NO and C when in. So I'm struggling even to make sense of the "normally open " and "normally closed" designations (if that is indeed what they are)

I assume that the switches can be wired so that either the ring is permanently lit, or lit when on. Any ideas how?

 

[VicS]

I have 3 new switches to wire in. They are latching push-buttons with an illuminated ring around the button. I was hoping for instructions but not so, neither on the ebay listing nor in the bag when they came. I have asked the seller but no reply yet.

Contacts are labelled:-

+

C NO NC

_

I can find continuity only between NO and NC when the button is out, NO and C when in. So I'm struggling even to make sense of the "normally open " and "normally closed" designations (if that is indeed what they are)

I assume that the switches can be wired so that either the ring is permanently lit, or lit when on. Any ideas how?

I would have expected continuity between C and NC or C and NO .......... not between NC and NO

If that is so then ITYWF


+ and - are the connections to the illumination ( LED ????)

C is the common switch connection

NO is the normally open connection

NC is the normally closed connection

You can feed + from C, NO or NC depending upon whether you want the illumination on all the time, when the switch is on or when the switch is off

 

[VicS]

If however there is continuity between NO and NC when the button is out, NO and C when in you will have to wire you supply to NO and the load to NC, assuming you just want to use the switch as an on/off switch, and + to NO, NC or C depending upon how you want the illumination to operate.

You dont explain, however, what you are using the switch for or why you bought a changeover ( SPDT ) switch rather than a simple ON/OFF (SPST) switch.

 

[Hadenough]

https://www.google.co.uk/search?q=a...ved=0ahUKEwj5nbyo4uLKAhWIlxoKHc3hDm4Q_AUIBygB

 

[superheat6k]

If you are wiring into the positive feed to the piece of equipment you can simply use the positive feed to + then connect a negative feed to - . Depending upon the internal switch contact layout this will either light all the time or when the switch is on.

If the former then you can change it to switch the light on only when the switch is on by taking the +ve feed from the load side of the switched feed.

Assuming this is simply On / Off then the switch will be C and NO.

Your description suggests the NO and C have been muddled in the labelling.

If the + & - puts the backlight on all the time you have the option of taking a feed for this from your instrument backlighting circuit.

 

[ianj99]

Best to check the leds are designed for 12v (ie have a built in resistor) before you connect them.

With a couple of diodes and a resistor you could wire the led so it glows dim when the instrument panel illumination is on, and then more brightly when the button is pressed.

 

[VicS]

Best to check the leds are designed for 12v (ie have a built in resistor) before you connect them.

With a couple of diodes and a resistor you could wire the led so it glows dim when the instrument panel illumination is on, and then more brightly when the button is pressed.

Hopefully the OP has bought a switch with a spec suitable for his intended use.. It might even be marked with the voltage.

 

[Slocumotion]

Thanks for all that. Great help -diagrams and all!
Yes I did buy 12v switches . They are intended for lighting options.
Nothing in the description suggests they are changeover types ,but then the listing says they have "screw clamp terminals" - ( which they do not, and there is a view of the backs showing solder tags). I guess that's Chinglish for "backnut " ( And there is your thread drift starter should you need one)

 

[Slocumotion]

I was right to ask here (though I should have done a better Google image search first).
This is the reply from the seller -

"Thank you for your mail and sorry for the problem.

Sorry we have no instruction for it. Could you please refer to the item link or ask someone professional? Sorry for the inconvenience.

Any question, please contact us, and we will try our best to solve it.

Have a nice day.

best regards."

 

[PCUK]

At least they are nice and polite - and honest about it!