Bus supply to supply the bus system with 15 V DC for up to 35 bus participants. The bus supply is permanently short-circuit proof. The operating status, possible short circuits and activities on the bus are signaled via 2 LEDs. Connection for mains voltage on the input side and connection for bus line on the output side, polarity can be reversed, to supply the end devices. The connections are made via screw terminals. Use of standard installation material, error feedback to the system possible. Housing made of flame-retardant polycarbonate, halogen-free, suitable for control cabinet installation on 35 mm top hat rail in accordance with EN 50022, protection class IP20, ambient temperature 0 to 50 °C.