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Performance
   
Rated Torque 1 – 125 Nm 126-1000 Nm 1001-4000 Nm
Class A
On-Off
Cycles per houra
15 10 5
Class B
Inching
Starts per hourb
120 60 30
Class C
Modulating
Starts per hourc
1200 600 300
Notes for the table can be found in the draft standard:

To a) : One cycle consists of nominal 90o angular travel in both directions ( i.e  90o to open and 90o to close), based on an averaged load of at least 30 % of the rated torque with the ability to transmit 100 % of the rated torque for at least 5 % at each end of travel, with a cumulative operating time not exceeding 15 minutes in one hour.

To b) : One start consists of a movement of at least 1o in either direction, with a load of at least 30 % of the rated torque. The cyclic duration factor  ( i.e. the ratio between the running period and total period ) shall not be less than 25 % (e.g. 1 sec. running and 3 sec. resting ).

To c) : One start consists of a movement of at least 1o in either direction, with a load of at least 30 % of the rated torque.