British General Fortress 16A 2-Pole Digital 2-Channel Consumer Unit Timer Module (4238P)

Hi Retneprac12, They are Normally Closet terminals to allow for devices or circuits which require this, or to allow for switching between circuits or use in a 2-way circuit as with any normal 2-way light switch.

Hi Retneprac12, Yes, the timer function has a separate supply connection to each of the channel connections, so there is L and N on the right for the timer function, then channel one has terminals 1, 2, and 3 with 2 being the input L and 1 being the output SL, channel two has terminals 4, 5 and 6 with 5 being input L and 4 being the output SL. This layout allows for separate breakers to be feeding each of the 16A rated switch mechanisms, and a third running the timer function.

Hi Nickstay, As long as you do not overload either channel (16A / 3840W resistive, 10A / 2400W inductive each) then it doesn't particularly make any difference what you are actually controlling.

Hi Daveyravey, This consumer unit timer fits onto a standard DIN rail as found in all BG consumer units (and pretty much all other manufacturers' as well).