• Murphy


The AT03069 is a completely reliable heavy-duty device developed specifically to automatically control engine speed to meet system demand.

Low current, high torque, solid-state switching and an electronic clutch make it ideal for all automatic and semiautomatic engine systems. Used with the appropriate Murphy Swichgage® near constant pressure, level and load can be maintained. Speed changes are made slowly and smoothly. The device saves fuel, engine wear, horsepower and labor. One model can be used with both 12- and 24-VDC systems. Check with our engineers for help with other applications where speed control can improve your system.

Specifications Downloads
Specifications Drawer: 
  • Voltage: 11-28 VDC negative ground.
  • Maximum Current: 500 mA (1/2 amp).
  • Standby Current: Approx. 7 mA.
  • Increase and Decrease: Inputs float at approx. 8.4 VDC. Grounding inputs causes 8-18 mA of current to flow from either.
  • Torque: 25 inch pounds.
  • Sealed limit switches: Factory adjusted, controls maximum travel.
  • Linkage adjustment on lever arm—5 holes: Adjusts travel: 1-3/16 in. (30 mm); 1-11/16 in. (43 mm); 2 in. (51 mm); 2-1/4 in. (57 mm) approximately. Travel Time: 11 to 20 seconds depending on the voltage and force applied.
  • Dimensions: See reverse side.
  • Net Weight: 5 lb. (2.27 kg)
Literature Drawer: 

Additional product documentation can be found on our product support website or by clicking the Help Center button above.