The illuminated push switches have a changeover mechanism & may be used as switches or pushbuttons. Installed using metal fixing nuts for control panel thicknesses up to 6.5 mm. Housing & front panel made from black thermoplastic with protection degree IP 40. The contact elements (gold contacts) can be attached to both sides of the housing (1 element per side) & are locked centrally by a quarter turn of the red locking pin. Both standard contact elements (1O + 1C) & double contact elements (2O + 2C) can be used (see note).