Speed controller for continuously variable control of fans. Minimum speed adjustable. Can be used for surface and flush mounting, exception: STX 4 only for surface mounting. Functional principle: phase control. Recommended distance from radio and television sets: 3 m. Switch on the fans to maximum speed by turning the control knob. Turning further reduces the speed. Splash-proof. Built-in temperature cut-off device. Orange LED operating display. CE mark. Including spare fuse. Additional switching contact (230 V), e.g. for controlling a flap. Due to the phase control technology, a physically caused humming noise can occur in the lower speed range. In rooms where low-noise fan operation is required, use 5-stage transformers TRE... to control the speed. Can be mounted on walls, but avoid on ceilings due to temperature build-up. STX 1.5, STX 2.5: Width x height x depth when used for surface mounting: 82 mm x 89 mm x 65 mm, Width x height x depth when used for flush mounting: 50 mm x 50 mm x 35 mm, STX 4: Width x height x depth when used for surface mounting: 82 mm x 89 mm x 65 mmArticle: STX 2.5, Voltage type: Alternating current, Rated voltage: 230 V, Maximum load: 2.5 A, Minimum load: 0.2 A, Protection class: IP 44, Installation type: Surface or flush-mounted, Color: white, similar to RAL 9010, Weight: 0.16 kg, Weight with packaging: 0.2 kg, Width: 82 mm, Height: 89 mm, Depth: 65 mm, Width with packaging: 85 mm, Height with packaging: 95 mm, Depth with packaging: 70 mm