RTRE 5 Speed Controller
This Systemair 3 speed controller works in conjunction with the single-phase acoustic centrifugal square duct box fan we have for sale here.
This three-speed controller has a manual five-step transformer.
By altering the supply voltage, a single-phase transformer controls the speed of the fan in five fixed steps. Using the control knob on the front of the unit, the steps are then adjusted manually.
For safety purposes, an integral motor protection device cuts the supply voltage to the fan if the thermal contact in the fan motor is activated. The unit is reset by turning the knob to “0” for 10 seconds, after which the unit restarts. Supply voltage: 230V 50/60Hz.