Speed controller for stepless control of fans. VDE-tested. For one direction of rotation. Can be installed on a 35 mm standard profile rail. Green LED operating display. 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. Article: STSX 2.5, Voltage type: Alternating current, Rated voltage: 230 V, Maximum load: 2.5 A, Minimum load: 0.1 A, Protection class: IP 30, Installation type: Distribution panel / control cabinet, Color: light gray, similar to RAL 7035, Weight: 0.1 kg, Weight with packaging: 0.12 kg, Width: 35 mm, Height: 94 mm, Depth: 86 mm, Width with packaging: 40 mm, Height with packaging: 95 mm, Depth with packaging: 96 mm