20975247 LM-BV Bus power supply with 15VDC for up to 100 bus subscribers, cascadable, resistant to sustained short circuit. On the output side connection for bus line, polarity reversible, for control of peripheral devices; optional connection for signalling relays; use of standard installation materials; Error messages to the system are possible; including a status LED for indication of the operating status. case constructed from fire resistant polycarbonate, halogen free, suitable for installation on 35mm rail according to EN 50022, degree of protection IP20, ambient temperature 0 to 50 °C.