The Hager ARR920U 20A Arc Fault Detection device is the latest generation of Arc Fault detection device (AFDD) from Hager. It utilizes sophisticated algorithms to monitor the electronic signatures of devices energized on a circuit. This single module device is designed to fit all Hager consumer units and is equipped with a range of safety and fault finding features. It is a double pole Single Module AFDD RCBO 1M 20A B curve 6kA Type A 30mA with ProTools - On-Board Diagnostics, On-Board Diagnostics using the Hager Pilot App, Bluetooth software updates, and Hourly Self-test functionality. Ideal for use in fuse boards and fuse boxes.