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The Ohmite ACS-5S-3K6-J is an adjustable-speed, heavy-duty delay-off system. It consists of a control board and an adjustable output motor control circuit. The system is designed to provide adjustable control of fan speed to optimize air flow in variable-sized enclosures. The system is suitable for a variety of applications, including HVAC, cooling, industrial/machine ventilation, and other applications. The system is capable of controlling fan speeds up to 6000 rpm, with 3-phase or single-phase, 230V AC or 115V AC inputs. It features adjustable, linear and ramp-down speed control, quick setup and programming of speeds, adjustable override time, and adjustable fan speed based on temperature readings.