Siemens SENTRON 3WL10 Series Manual page 81

Mechanical operating cycles counter (MOC)
Unlike the communication link accessories, the mechanical operating cycles counter MOC
does not have a remote signaling option. It displays the number of mechanical switching
operations performed by the circuit breaker directly on the front of the circuit breaker.
Note
Because the number of operating cycles performed influences the maintenance intervals,
the mechanical operating cycles counter MOC can provide the necessary basis for defining
them.
You will find information on maintenance in Chapter Service and maintenance (Page 169)
The MOC can only be installed in conjunction with a spring charging motor.
Air circuit breaker 3WL10
Manual, 11/2017, L1V30499596002-01
Accessories
3.2 Electronic accessories
79