Can someone ID thing button for me? I need to replace it and not sure what to buy.

It's burned out so i cannot with a meter to figure it out - it's not doing what it's suppose to.

enter image description here

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    \$\begingroup\$ You can take it apart to see. And question, is it a double action switch (as in you push it in half way, it does one thing, push it in harder/all the way, it does a second thing, like go faster?) \$\endgroup\$ – Passerby Jun 26 '13 at 23:30
  • \$\begingroup\$ Also, the type/model/manufacturer of table would help. Is this a industrial table, used in an industry? Can you take the foot switch apart, as you would need to do it anyway? \$\endgroup\$ – Passerby Jun 26 '13 at 23:31
  • \$\begingroup\$ Its a push button toggle switch rated at about 2A. ON-COMMON-ON \$\endgroup\$ – JIm Dearden Jun 26 '13 at 23:32

You didn't provide an image of the mechanical side of the switch, so it's hard to say whether it is a slide or a toggle or another kind.

Because it has three terminals, it's probably a SPDT (single pole, double throw) switch. This means that it has a single "input" and two possible "outputs" depending on the position of the switch. (Or you can think of it as two inputs with one output, but the function is the same.)

The "N/O" markings mean "Normally Open" which would be commonly found on a momentary switch, meaning the switch contacts are open unless the switch is actuated. Without more information, it's hard to say what this means for this specific switch. My guess would be that the switch has a center position that is normally open, and you actuate the switch in one of two directions to connect to one or the other throw.


Oops I missed that you said "button" in your text. If it's really a button, the N/O does not make sense. Since it is SPDT, the pole is connected to one throw in the disengaged position, and when pushed, the pole is connected to the other throw. There is no "normally open" about it.

Sometimes switches will have extra terminals that aren't connected (or placeholders for pins), so it's possible that the switch is normally open with an unused terminal, but the fact that all terminals in the photo have wires attached indicates to me that the "N/O" designation is probably false.

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  • \$\begingroup\$ the other side is a button.. I cannot show it because the inside is inside a table stand and it's all covered with a metal cover that makes up a foot petal .. it gets attached to a motor that rises a table and the other switch (with only two wires) lowers the table.. maybe thats helpful? THANKS! \$\endgroup\$ – theMezz Jun 26 '13 at 22:33
  • \$\begingroup\$ I cannot show all the wiring either because its inside the metal part of the table riser \$\endgroup\$ – theMezz Jun 26 '13 at 22:33
  • \$\begingroup\$ Buttons are either momentary or push-on/push-off. If the button springs back after you release it, it's momentary. Look for a panel mount SPDT pushbutton switch that matches the action type of your existing button. Also measure the diameter of the panel opening, as you'll want to match it. Finally (and most importantly) make sure you select one with electrical ratings that meet or exceed what the switch is operating. \$\endgroup\$ – JYelton Jun 26 '13 at 22:39
  • \$\begingroup\$ It's also possible that it's an illuminated switch. That would correlate well with the fact that it has three leads. Two for the switch, and a third for power. \$\endgroup\$ – Connor Wolf Jun 26 '13 at 22:51
  • \$\begingroup\$ thank you. any good websites that has a nice variety of buttons? \$\endgroup\$ – theMezz Jun 26 '13 at 22:52

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