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Synchron "600" Series AC timing motors are available with an operational one-way clutch which permits a reset function in the application. Also available in this series is a two-way clutch which can be used to protect the geartrain from excessive loading at speeds below 6 rpm. The Type "C" units have the traditional pear-shape footprint with two-hole mounting and provide a selected synchronous speed range from 360 rev/min to 0.50 rev/hour. Various windings for either 24, 110 or 220 VAC and 50 or 60 Hz permit a wide range of application power sources. Shaft torque, rated at 1 rpm, ranges from 8 oz-in to 40 oz-in depending on the selected winding and the wattage rating (3, 4, 5 or 6 Watts). Maximum dynamic torque is generally limited to 30 oz-in, with a static output torque limit of 90 oz-in. The compact motor-gearbox package, only 1.37 inches long, is permanently lubricated and requires no maintenance during its lifetime. Gear material has been selected for the quiet operation and long life required in time-measurement instrumentation and event recording applications.