Wrap Spring Operation CB Series wrap spring clutch/brake combinations are designed for applications requiring a continuous rotational input being converted into starting and stopping a load.  To start motion, the solenoid is pulsed, moving the actuator arm away from the control collar

Warner Electric wrap spring clutches and brakes are a simple, low cost and easily adaptable answer to various stop-start applications.  Ideally suited to rotary indexing tables, their speed and accuracy offers both excellent repeatability (as there is no cumulative error) and minimum