Mitsubishi Electric C Series Handling And Maintenance page 69

(2) Lock cover (LC)
The lock cover is a plug-in type handle mechanism that can prohibit operation readily without
applying any lock. A "Warning Tag" can be attached to it.
One can safely use this mechanism since it may trip with its handle locked at ON position if any
overcurrent flows.
The wiring work shall be performed with the master circuit-breaker OFF even if the unit is
locked into OFF position. Since an electric shock is to be apprehended, always confirm that
there is no current flowing before proceeding to the wiring.
1 Use the circuit-breaker always with the lock cover fully inserted. (Insert once again if the circuit-
breaker trips.)
2 Never try to trip by the trip button with the circuit-breaker locked into OFF position. Otherwise,
the internal mechanism may be destructed.
67
Inoperable
CAUTION