Trapped key systems use a series of mechanical locks and key(s) to control the access of gates or doors to running equipment or machines for safety. Rotary key or push-pull style tongue sets include a main station and multiple lock/key modules; solenoid locking versions are also available.
A trapped key system uses a series of mechanical locks and keys to control the access to running equipment or machines, ensuring safe access to those machines. These systems rely on the transfer of keys between a power isolation switch (or control switch) and a mechanical locking mechanism fixed on a guard.
The essential feature of the system is that a removable key is literally trapped either in the guard lock or in the control switch. The lock on the guard is arranged so that the key can be released only when the guard has been closed and locked.
Where there is more than one guard on a machine, an exchange box will accommodate the equivalent number of access keys. A series of operations has to be carried out in a pre-determined sequence for the current key to be exchanged for the next key in the sequence. Human operation of locking/unlocking provides first hand, observable safety.
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Rotary trapped key interlock switch systems control access to dangerous equipment with locks and mechanical coded rotary keys.
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Push-pull trapped key systems utilize slide in/ slide out keys and their corresponding modules to safeguard dangerous equipment.
The purchaser/installer is solely responsible for the application of these components and ensuring all necessary steps have been taken to assure each application and use meets all performance and applicable safety requirements and/or local, national and/or international safety codes as required by the application. AutomationDirect cannot certify that our products used solely or in conjunction with other AutomationDirect or other vendors products will assure safety for any application.
Any person using or applying any products sold by AutomationDirect is responsible for learning the safety requirements for their individual application and applying them, and therefore assumes all risks, and accepts full and complete responsibility for the selection and suitability of the product for their respective application.
AutomationDirect does not provide design or consulting services, and cannot advise whether any specific application or use of our products would ensure compliance with the safety requirements for any application.