AC/DC regulated switching power supplies for running stepper motors and other equipment. 27 volt regulated output produces 12% more torque and speed compared to 24 volt supplies. The 320W power supplies are enclosed with a metal frame with a temperature sensing fan control and a terminal strip for easy wiring; AC power cord is not included. Use one power supply per motor, recommended for over-driving the large 110mm series motors. All power supplies work anywhere in the world, universal 110-230VAC, 50/60 hz, UL/CSA FCC approved. Email firstname.lastname@example.org for professional engineering advice.