The K Lock is a key operated mechanical bolt interlock that is suitable for the control of electrical switchgear. The standard unit comes with a 15.88 mm diameter bolt available in various lengths, that is used to control the rotation or movement of operating handles or toggles of electrical switchgear. Many suppliers of switchgear equipment have mounting kits available for Castell interlocks. The lock is manufactured in brass or stainless steel.
The K bolt interlock safety component is used as a part of an integrated safety system.
While power supply to the system is switched on, the access doors to the hazardous area are locked closed.
Key A is trapped in the disconnector K bolt intertlock (1) while the process is on.
To enter the hazardous area, the disconnector is turned to the off position and key A is turned and released, locking the disconnector in the disengaged position.
Key A is then taken to the grounding switch. Key A is inserted in the second K lock (2) which retracts the bolt enabling the cammed switch lever to be rotated to engage the ground. Once rotated, the recess in the cam aligns with the next K lock (3) with key B trapped in its lock. Key B can now be removed from K lock (3), which now locks the lever in place ensuring that the ground connection cannot be broken.
The system is now disconnected and grounded, key B can be taken to operate the access interlock on the door of the hazardous area to gain access into it.