Includes: a changeover mechanism (see diagram A, page 694) & may be used as switches or push buttons (no illumination). Mounted with metal fixing nuts for control panel thicknesses up to 15 mm. The contact elements (max. 2) can be attached to both sides of the housing & are locked centrally by a quarter turn of the red locking pin (see diagram B, page 694). Additional contact elements may be ordered separately (see contact elements).