Wago 8 level same potential terminal block din 35x15mm lock plain 727 series wago 727 137 wago 727 137 8 level same potential terminal block with locking clips for din rail 35x15mm plain complies with en60715 all clamping points are short circuited colour light grey 25pcs wago 727 137 8 level same potential block plain lock din 15mm light grey 25pk