Seco-Larm - Mortise Cylinder Key Switch - Momentary AR_ExitDevices An astragal is a piece

An astragal is a piece of hardware that is used on a pair of doors to seal the gap between the doors when they are closed

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Seco-Larm - Mortise Cylinder Key Switch - Momentary AR_ExitDevices An astragal is a pieceSingle Gang, Keyed mortise cylinder (2 keys included) If a keypad or proximity card reader fails to activate an electronic lock, the user can switch between normally closed (N. C.) and normally open (N. O.) contacts using the Single Gang Mortise Cylinder Key Switches (available with either momentary or maintained outputs), forcing the door to open. This acts as a backup for access control systems, so that the system does not rely on the integrity of a