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I've DESTROYED 3 piezo buttons :((((

gubavac111

New Member
So, I've damaged 3 piezo buttons...

This is the piezo button: https://uk.rs-online.com/web/p/piezo-switches/1241087

Datasheet: https://docs.rs-online.com/9e69/0900766b8152fb83.pdf

Quick explanation on what MPZI019/F/BL/24 is:

MPZI - Illuminated piezo switch
019 - 19mm diamater
F - Flat head
BL - color of illumination, in this case it is blue
24V - illuminating LED voltage

Also, it is a momentary switch, not latching.

This is the pinout:


1.JPG




This is how I connected it:

2.JPG



If you look at the datasheet, the switching contact is rated at 24VACDC 1 A.

1656667043247.png




It seems that I have destroyed 3 buttons.

There is a short between brown and yellow.


What did I do wrong???
 
Solution
That series of switches includes ones without LEDs; they do not require power to work (other than the "latching toggle" one).

The LED is a totally separate indicator lamp in the momentary type.

The switching device is triggered by voltage from a piezo transducer & also possibly powered by stored energy - they probably draw a few microamps when open circuit & charge a small capacitor to hold the switch on for a short time when pressed.

Once you have found the LED wires, ignore them for now.

Just use the other two. Connect to power with a simple load in series - eg. a 24V led & resistor combination.
Try both polarities in case it only works one way.

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