You really need to expand a little on what you mean and what happened.
the old switch was wouldn't come on so when so when i took the pull cord down to check it the neutral cable in the load termal was burnt and melted in to the to the pull cord switch, so i striped the cables back and put...
i went to change a 45amp pull cord for a shower and when i changed it the new 1 kept blowing so i took it back to the shop and they changed it and the sames happening iv put the feed in and the load to the shower is only a 8.5 kw shower o 6mm all i was doing was changeing the pull cord over...