This technical factor defines the maximum period of time during which a drive can be operated without interruption. A pre-set currentless time must also be maintained following operation. Both time values are shown as a ratio which indicates the intermittent duty data (ID). A factor of 10% is now standard in the furniture sector - this means that a 2-minute period of uninterrupted operation must be followed by a break of 18 minutes or max. 5 switching cycles per minute. Of course, in the event of operation for a shorter period of time, the break can be correspondingly shorter. It is vital for the operator to follow the instructions regarding intermittent duty, otherwise possible overloading might result in the activation of the protective devices.