FASEC 33 is an instrument designed to control speed and is particularly suitable for fan applications.

Its standard version provides a triac output to drive a load up to 2.5 A, while a special version allows regulation of loads up to 7 A. The latter version contemplates the use of an LC filter fitted outside the instrument.  Such filter is necessary to reduce conducted emissions and radio frequency due to the type of regulation.

The temperature probe is galvanically insulated from the power voltage.

Another special model is available for speed regulation in ZHIEL motors.