Most push buttons have a momentary action. Latching types (ON/OFF or “maintained” actuation) are often larger, deeper in body, slightly more expensive, and often not available in the style you want to use. So you can get stuck in your development if you need a small on/off switch to lock power to a load. In this “design ideas” we show you how you can use a simple momentary SPNO (single pole, normally open) push button switch to lock out power to a load.
It is essential for any HMI application to choose the LED with a luminous intensity that is compatible with its working environment: in
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