Anyone out there in Screwfixforumland got an old copy of the regs (or any other resource) which contains the characteristic time-current curves for BS3871 type 1, 2 and 3 MCBs. In particular I'm after 30A type 2, but I guess they'd all be useful. Make contact via my site if you can help (or post link here if you know of one). Ta, PCE pcelectrics.co.uk