SIEMENS

auxiliary switch, lateral, 1 NO + 1 NC, on the left: 41/42, 53/54, on the right: 21/22, 33/34, current path: 1 NC, 1 NO, screw terminal, for contactors 3RT2.1

KEY-PLUG W780, replaceable medium for activating iFeatures for Scalance W in access point mode allows simple device exchange in case of failure and recording configuration data respectively project and application data, for all Scalance W with plug slot

KEY-PLUG W740, Removable data storage medium for enabling of iFeatures for SCALANCE W in client mode, permits simple device replacement in event of fault and the recording of configuration data; or configuration and application data, For all SCALANCE W devices with plug slot.