Auxiliary switches report the status of the main devices on which they are mounted. The Hi 11 auxiliary switch is suitable for FI/LS combinations of the DRCBO 3 series and circuit breakers of the ELS 3 series. Properties: Auxiliary switch function, can be retrofitted, small size, type of installation: to the left of the base device using screws, quick fastening to the mounting rail, any installation position, 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 device.