Under normal circumstances, a 4 pins push button typically refers to a push button switch with one pair of switch pins and one pair of LED pins for illuminated push buttons. In another scenario, with two pairs of switch pins, the button switch can simultaneously control two circuits. You can distinguish between these two types of push buttons by examining whether they have an indicator light on the exterior.
Here is a wiring diagram for illuminated buttons(The picture above). Before wiring, please ensure that your power supply matches the LED indicator on the button.
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