Sola/Hevi-Duty STFV050-10N Surge Protector, Din Rail, Filter, 1P, 25 kA

I was browsing a seller on eBay is listing and they sell mainly technical stuff there the name is CGL three four seven eight and it's also have industrial components quite interesting stuff and one of the things they had was this sort of search suppressor and it's designed to go into a distribution board I mean in Europe we typically have distribution boards that take din rail mounting components and it's got the live and neutral in and then it's gotten out of connection in bottom and if you look at the bottom this AB set of bus powered couple of screws and a little bus bar slotted in the side that links them together and I'm guessing that these blocks which do unplug with a bit of effort these I'm guessing our metal oxide varistor blocks and I look at these and think there's a little green paper at the bottom that lanes up with that I'm not sure that's for a and then there's a little f