A tactile switch is a make-contact with 4 legs. Pay attention to the pin orientation: pins are grouped 2 by 2, so you can measure with a multimeter which pins are connected. The pins that are not connected when the button is not pressed encompass the make-contact.
- Rated voltage. These switches are low voltage only devices (maximal 15 V).
- Rated current. These switches can only switch low currents (maximal 20 mA).