The Gira KNX Power Supply 640 mA Uninterruptible (1079 00) is designed to provide KNX bus power with battery-backed operation for installations requiring continued bus availability during a mains interruption. Its rated KNX bus output capacity is 640 mA; this is the current available to the bus, not the current consumed by the power supply as a KNX device. Listed dimensions are 144 × 90 × 66 mm and the unit occupies eight DIN modules, with DIN-rail mounting and IP20 protection. Documented functions include an integrated choke, overload and short-circuit protection, and a fault-signalling contact. Verify battery requirements, operating limits, wiring and maintenance procedures in the current manufacturer documentation before installation.