Mechanical Interlocks

Interlock	Function of interlock	Method of operation of interlock
Between truck and low-voltage connector	The truck cannot be actuated unless the low-voltage connector is inserted .	The opening for the moving crank handle is locked.
Between truck and earthing switch	The truck cannot be racked in if the earthing switch is ON.	The moving crank handle is uncoupled automatically.
Between truck and earthing switch	The earthing switch can no longer be switched on if the truck has left its disconnected position.	The rotary movement of the earthing switch lever is blocked. Do not apply force!
Between the circuit breaker and the truck	Circuit breaker cannot be racked in or racked out while it is switched on.	The opening for the moving crank handle is locked.
Between the circuit breaker and the truck	Circuit breaker cannot be switched on unless it is completely in its disconnected or service position and the operating crank for the rack in mechanism has been removed	The circuit breaker cannot be switched on or off
Between the cable compartment cover and the earthing switch (optional)	The cable compartment cover can only be removed if the earthing switch is ON.	The cable compartment cover is locked mechanically by means of a sheet metal plate.
Between the truck and the front door (optional)	The front door can only be opened if the truck is in its disconnected position.	The front door cannot be lifted via the opening handle unless the truck is in disconnected position.
Between the truck and the front door (optional)	If the front door is opened, the truck cannot be moved into service position.	The crank of the truck cannot be inserted if the front door is open.