The relayCUE-8 is an 8-channel relay switching unit for loads up to 10A per channel. The unit can be controlled by serial channel RS-485 and by potential free contact inputs. These contact inputs are intended to be used mainly as wall switches for direct control of dedicated relay circuits. To fulfil various tasks, the input operation can be assigned to different functions by setting their functional parameters in the project configuration. The programmable parameters are response on the input, delayed on/off, pulse, drapes and motor control sequence. Basic parameters can be set using buttons on front panel, other parameters are set by serial channel. Front panel includes LED indicators for power supply, serial channel activity and status of all power relays. The unit can be combined with all power express units. The enclosure allows simple installation on DIN rail.