My selling 2-pole RCDs and MCBs both of Hager I could easily mount. One should not expect great quality for the price. The PE / N terminal block was mounted in the upper region within the 12-module distributor, but I wanted to have them at the bottom. The left mounting this bar was a little "move" so broken and pulling out of the bar, which was very firmly attached, the left side is flat broke. However, I have not returned the product because even with a fastening side, holding the bar. A recommendation to the seller / poor Chinese who assembles the thing: you let just this PE-bar-less easily fix it or with some glue tape. I did not want to spend much money for as a part of which is mounted with me in the garage and bought just this. At the hardware store, I was too, but there the things were much more expensive and frankly even China stuff, which is why I have chosen this. I bought the distribution for 4 to 12 modules separately but the assessment is the same, which is why the reviews contain the same text. One drawback: I made two distributor for 4 modules with the same order and wanted to return only one. Sorry, there was not .... well ... I have a reserve as now.