NETIO produces some products with several electrical socket types. The DE abbreviation then refers to products with Type F sockets.
110/230VAC sockets in a standard electrical wiring are protected with circuit breakers (or fuses) against short circuit or overload. When there is a power outage, circuit breakers sometimes trip when the power is restored if there are too many appliances with a switching power supply connected to the same circuit breaker. See Inrush current.