The 5140 series switches are fully adjustable to allow activation by most cylinder cams. Single and double gang plates are available for flush wall or surface box mounting. A narrow switch plate is offered for mounting on hollow metal or aluminum door frames. Switch plates are furnished in satin finish, stainless steel or anodized aluminum. Key operated mortise cylinder switches can restrict use of electrically operated entrance control systems, alarms, electric locking devices and other similar equipment. Actuation of switch controls can be limited to authorized key carrying personnel. Ideal for after hours access into buildings, such as apartment entrances with magnetic locks and time controlled locking systems. Key switches can also be used to authorize by-passing or shunting of door alarms and delayed release exit control systems. Other applications are security interlock override to restricted areas. The mode selection of day/ night automatic door operating systems can be controlled with key switches. Key switches may be combined with LEDs to provide door status or other conditions. The sounder option can be used with other logic controls to alert personnel of an alarm condition and then be reset from the key switch. Switch actions can be momentary, maintained or alternate action. A pneumatic time delay module can be used to provide adjustable delayed switching of auxiliary contacts. Key switches may combine multiple operating modes, such as maintained and momentary action, in the same assembly. A combination of this configuration would typically have a center off position with the action being left for momentary and right for maintained. Additional security can be provided with the optional concealed tamper switch. This can be used to signal an alarm monitoring device of attempts to defeat the key switch. Tamper resistant, socket hex head screws with security pins, are also available as an option to further enhance security.