Emergency power transfer

This category includes transfer switches and switching devices for emergency power and backup power operation of photovoltaic and storage systems. In the event of a power failure, these devices automatically disconnect consumers from the public grid and switch to supply from inverters and battery storage, typically 3-phase and with switching times in the range of seconds. They are used to ensure the power supply of critical consumers, either as backup power or as grid-independent island operation. Key characteristics include the maximum output current, apparent power in kVA, and the number of combinable inverters.