one key only This Eaton C22S-WS3-MS1-K11 keyed selector switch has a black 3-position bezel that twists for momentary operation. The bezel actuates a normally open (NO) and a normally-closed (NC) single-pole, single-throw (SPST) contact and the switch mounts through a 22.5 mm diameter control panel hole. It is Underwriters Laboratories Listed (UL), Canadian Standards Association (CSA) certified, and European Conformity (CE) compliant for quality assurance and meets the Ingress Protection (IP) 66 standard for protection against dust and liquids. This emergency pushbutton is suitable for use in applications such as in manufacturing process control systems. Three-position twist bezel actuator unit for momentary operation Keyed, twist-to-select selector switch 1 NC + 1 NO contacts, single-pole, single throw Mounts through 22.5 mm diameter control panel hole UL Listed, CSA certified, and CE compliant and meets IP 66 standard 091518-01