DIY Doctor

Main navigation

63A or 80A rccb

Postby steve bain » Tue Dec 08, 2009 11:24 pm

what is the difference between 63A and 80A RCCB's? is one just capable of taking more power through it?
if i have a 100A main incomer with 2 63A rccb (17th Ed) is it safe to swap one of them to an 80A?
my 63A RCCB has broken and i have a spare 80A in box (like you do!). just want to make sure it is ok and safe before i get someone out and potential waste their time and my money.


steve bain
Rank: Tradesman
Progress to next rank:
Posts: 31
Joined: Tue Jan 20, 2009 2:43 pm


Simply Build It

Postby moggy1968 » Wed Dec 09, 2009 9:54 pm

If this is just an RCD it provides no overcurrent protection so as you surmise the rating is just the current it can stand.
If it is an RCBO it is a measure of it's trip current
Rank: Ganger
Progress to next rank:
Posts: 198
Joined: Sat Feb 21, 2009 11:32 am

Postby ericmark » Thu Dec 10, 2009 9:09 am

Going up in amps is not a problem as long as it does fit.
There are three ratings
1) Amount of amps it can handle with out over heating i.e. 80
2) The amount of amps it can switch which will be a lot higher. In 1000's of amps range and is matched to let through amps on main fuse. i.e. The few thousand amps that's flows for few milli-seconds before fuse blows on short circuit.
3) The amount of amps it trips at i.e. 0.03A
You need to check all three match.
Rank: Project Manager
Posts: 2674
Joined: Fri Oct 02, 2009 8:49 pm
Location: Llanfair Caereinion, Mid Wales.

Display posts from previous
Sort by
Order by

  • DIY How to Project Guides
  • DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!

  • Related Topics