100 V line attenuator with 3-wire or 4-wire priority with relay for flush or surface mounting.Ergonomically designed potentiometer with 10 attenuation and switch-off positions for easy handling. They offer 2-wire inputs as well as 3-wire and 4-wire inputs priority systems Therefore, they are perfect for issuing priority warnings in large installations. Thanks to their standard dimensions, they can be fitted with universal square and round boxes for plasterboard partition walls (plasterboard).