The National Time 3M series clock mechanisms employ worm/worm gear drive technology to provide smooth and continuous advancement of the hands. In addition, this technology protects the clock mechanism from nature's harshest elements such as wind shear, snow and ice. 

3MR

The 3MR employs an innovative clutch system and reversible motor that will advance the hands at 10 times speed for time correction. A Master Clock Controller will provide automatic time corrections for daylight savings and power outages. The 3MR is also compatible with 970 Series manual controls. 

3MDR

The 3MDR is a double face version of the 3MR. A single mechanism drives back-to-back clock dials with spacing between 8” and 16” with appropriate shaft selection.

3MI

The 3MI minute impulse advances the mechanism incrementally each minute utilizing a single direction motor. An MC3-MI master clock controller is required for operation and provides automatic corrections. 3MI clocks will not drift when employed in countries that do not regulate their frequency or in installations that may use generator backup systems. The MC3-MI master clock with the MC3-4SW circuit expansion switches allows the user to remotely adjust up to 4 clocks independently during installation or repair.