H Hardy Sparky (Mvc) Member Joined Jan 30, 2012 Messages 60 Reaction score 0 Jan 27, 2013 #1 Can a 100A 300MA RCCB Used as a main switch behind RCBOs ????
batty Snoopy™ Supporting Member Joined Feb 27, 2008 Messages 11,018 Reaction score 0 Jan 27, 2013 #2 Would need to have a time delay on it and better if RCBO's are double pole.