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Hi,

Looking for a bit of advice on the correct type of switch. I have a sprung vending machine coin return pull, the end of the rod (inside the machine) needs to operate a 12v on/off momentary type switch. So when the lever is in its normal position, then end is pushing the switch in & it's off, when it's pulled, the rod travels enough to release the switch & turn it on, when the lever is let go because its sprung the rod presses back on the switch, turning it off.

The ideal thing would a momentary switch (like a bell push) but the opposite way round so its off when its pressed in, on when its released.

Could I wire a micro switch to do something similar? I've seen latched switches, but from what I can work out, they don't return like a momentary switch?

Thanks in advance,
 
A 3 contact micro switch has a normally closed contact that is opened when the switch is pressed.
Another possibility is a reed switch which is closed when a magnet is in close proximity to it. These are used for door contacts by intruder alarms. By adjusting the magnets position it could probably do what you want.
 
As above, the term you are looking for is 'normally closed.' Still a momentary switch, but one that opens when pressed. Not as common in conventional pushbutton form, but widely available as microswitches, contact blocks for modular switches, etc. A changeover switch contains both normally-open and normally-closed contacts and is equally suitable.
 
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As above, the term you are looking for is 'normally closed.' Still a momentary switch, but one that opens when pressed. Not as common in conventional pushbutton form, but widely available as microswitches, contact blocks for modular switches, etc. A changeover switch contains both normally-open and normally-closed contacts and is equally suitable.
Thanks Lucien,

Aha, yes that was the term I need.

Thanks again,
 

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