Properties - Front-side retrofitting of QuickFlex lighting modules without removing the switch. Front-side measuring and test contacts, accessible without removing the switch. Quick-thread screws for claw fastening. Countersunk claws with return spring. High-gloss galvanized support ring insulated from the claw. With claw and screw fastening. With plug-in terminals. To be completed with central plate with inspection window for pull switch system M MEG3380-03xx /-04xx accessories LED lighting module for switches/buttons MEG3901-0000, MEG3901-0006, MEG3921-0000. Version 10 AX, AC 250 V.