have you checked the lamp type - see note in red
MK 1610 Time Delay Switch - 2 to 15 minutes.
This product is suitable for providing lighting for a pre-determined length of time in places
such as staircases, lobbies, etc., with automatic switch off to save energy.
Type of Load(s):
Tungsten Filament Lamp(s) to BS 161 with integral fuse(s)
Load Ratings: - 60W min - 400W max.
Range of adjustable Time Delay:
2 to 15 minutes
Fuse Rating: - 3A, to BS 646: 1958
Notes:
This product is not suitable for use with Fluorescent lamps, 2D or other energy saving lamps or Low Voltage Lighting Systems.
The load on the Time Delay Switch must not be less than the minimum and must not be greater than the maximum, specified above.