Opens and closes the contact according to a time that can be set between 1 and 7 minutes at 50 Hz （48 seconds to 5.6 minutes at 60 Hz）
This timer has a 2-position switch on the front panel： automatic operation： timer （after 20 s of operation, pressing the push-button restarts the timer）
forced operation： constant lighting
Time can be set in 15-second intervals using the thumb wheel.
