Fast-charging and absolutely maintenance-free supercaps (supercapacitors / EDLC) are used to buffer the DC supply voltage. Due to their high cycle stability, supercaps have a particularly long service life as energy storage devices. For the supplied application, this means that long-term availability is increased and maintenance is reduced. The compact all-in-one solution in a DIN rail housing is suitable for use in control cabinet applications and decentralised solutions for protecting embedded IPCs, controllers, motors, sensors, measurement, control and safety technology.