Wago 4 level same potential terminal block din 35x15mm no lock plain 727 series wago 727 238 wago 727 238 4 level same potential terminal block without locking clips for din rail 35x15mm plain complies with en60715 all clamping points are short circuited colour light grey 50pcs wago 727 238 4 level same potential block plain no lock light grey 50pk