LB Non-Illuminated Pushbutton w/ Protective Guard NKK Switches LB Non-Illuminated Pushbutton with Protective Guard is a Single Pole Double Throw (SPDT) non-illuminated pushbutton with a snap-in panel mount module. This non-illuminated pushbutton is rectangular in shape with a solder lug and silver contacts that facilitate quick electrical connection. The LB non-illuminated pushbutton includes a polyamide protective guard that opens to 90° and offers a manual closing function. This protective guard reduces the depth of the switch behind the panel by 0.5mm.