A mate of mine has a three phase supply in his works, one of the single phase breakers is getting slightly warm and tripping randomly. It's not a DIN rail mount, the breakers have clips at each end, one on to a locating rail and the other to the busbar. Seems to be an obsolete design (there are a few on eBay but not the right rating). Anyone know of any possible suppliers? I'm not even sure of the correct name for them.