have recently purchased a new fan isolator switch for bathroom fan "click mode". The problem i have is it doesn't state on the back a supply side or load side Terminals are L1, L2,N there are 2 of each but some are marked "common" am i right in thinking the ones marked common are supply side please can someone shed some light on this for me as i do not want to change switches unless 100% percent sure. Original one is cracked
Thanks
Thanks