I'm using these for my DC devices, I like the fact each device can be individually protected. More compact than a row(s) of terminal blocks however I wouldn't say they are super space savers though .
https://www.ebay.ca/itm/DIN-Rail-Mo...e=STRK:MEBIDX:IT&_trksid=p2057872.m2749.l2649
https://www.ebay.ca/itm/DIN-Rail-Mo...e=STRK:MEBIDX:IT&_trksid=p2057872.m2749.l2649