Self-cleaning, double-break, snap action switching system (with contact gap 2 x 0.5 mm). 1 normally closed or 1 normally open contact per element.Snap-action switching elements with soldering terminals at the sides: up to 4 switching element can be on a pushbutton (max. 4 normally closed and 4 normally open contacts). Snap-action switching element with axial plug-in terminals 2.8 mm stackable, only 1 switching element can be on a pushbutton.