It may be placed in any position on the appropriate grid or plate. The GRTLA CB can also be operated by slave push buttons. These time lag switches are in a grid module format. DANLERS manufacture three versions, one to suit the MK Grid Plus, one to suit the Crabtree grid and one to suit Eurodata plates. They may be placed in any position on the appropriate grid or plate. These grid time lag switches can be wired in parallel to operate the same load. They can also be operated by slave push buttons. For Crabtree grid Adjustable time lag - 2 mins to 2 hrs 3 wire version Needs neutral wire With illuminated push button