Arc fault protection devices (fire protection switches, AFDD) are devices for protection against serial and parallel arc faults in accordance with the requirements of DIN0100-420. They are colloquially referred to as 'fire protection switches'. They must be used for permanently installed final circuits up to 16 A in, for example, fire-prone premises or public facilities. They are recommended for bedrooms and final circuits with high connected loads, among other things. The devices detect high-frequency arc faults, such as those that can occur due to defects in the wiring. The early detection and subsequent shutdown of the final circuit if necessary prevents thermal influences from the arc fault. The risk of fire due to faulty electrical installation is significantly reduced. The respective reason for the triggering is displayed via a color code of the LED on the front of the device. The DAFDD 1 are compact combination devices with a triple function: arc fault detection, line protection and residual current tripping. They meet the requirements of 0100 Part 430 for the protection of systems in the event of short circuits and overloads, and for the protection of people, livestock and property in the event of earth fault currents in accordance with 0100 Part 410. The RCBO part (FI/LS functions) is independent of the mains voltage. With the residual current type A, sinusoidal alternating and pulsating direct residual currents can be detected. The contact position indicators and the residual current tripping indicator provide a quick overview of the operating status of the device. The devices up to 25 A are also characterized by a high rated switching capacity of 10 kA, the 32 A and 40 A devices of 6 kA. The line protection of the C characteristic is primarily suitable for power circuits with high inrush or peak currents. Standard devices are designed for monitoring
