Auxiliary switches report the status of the main devices on which they are mounted. DHi 11 are optionally auxiliary switches and fault signal switches for Doepke residual current circuit breakers of the DFS and DHS series. DHi 11 are suitable for switches with a blue toggle. In the 'auxiliary switch' operating mode they signal the switching on and off of the RCCB. In the 'fault signal switch' operating mode they only signal the tripping. Properties: Auxiliary switch or fault signal switch function, can be retrofitted to DFS and DHS with a black toggle (DHi 2) or with a blue toggle (DHi 11), small size, mounting type: to the left of the base unit by clamping, quick fastening to a mounting rail, installation position as desired, areas of application: These devices are suitable for querying the operating status of power supplies in residential and commercial buildings as well as industrial plants. Notes: The auxiliary switch does not affect the function of the base unit.