The SEM3 low level module is slim and multi-functional serving as a lighting only unit. It can be fitted with a fluorescent light as standard or an emergency light. Height 400mm, Width 400mm, Depth 175mm.
The SEM4 low level module is slim and multi-functional serving as a lighting and power unit. It can feed up to four remote SEM1 or SEM2 modules as well as having up to four sockets on the module itself. Height 400mm, Width 400mm (not including sockets), Depth 175mm.