Fitting new plug socket, 3 earth wires?

Hi

I am looking to fit a new plug socket to the wall, when I took the old one off, there was the normal 2 lives, 2 neutrals for the ring main, but there was 3 earth wires. 2 on the ring main, and one going to the case.

At the minute, all 3 earth wires are connected to the same connector on the back of the plug socket, however, when I did this on the new chrome plug socket (which has 2 earth connection points either side of the back, but both joined by a metal plate), it blew the relay in the fuse box.

Can someone help me with what I have done wrong please?


Cheers

John