High-quality arc fault detection device (AFDD) in combination with a residual current circuit-breaker/miniature circuit-breaker (RCBO), independent of mains voltage, contact position display red-green, terminal rear plug protection, tri-stable slide catch—enables removal from an existing closure assembly, comprehensive accessory product range can be retrofitted, wide range of rated fault currents, rated operational currents up to 40 A, trip types B, Cc, D, rated switching capacity 10 kA, suitable for use in the free (on-site power and outdoor distribution board) to -25 °C