As stated previously, it is a standard DIN rail mount system. The DIN rail is usually 35mm correct-section, with a plethora of terminals/mounts which affix to the rail. Phoenix, Weidmuller and Wago are but three companies manufacturing terminal blocks which can be used on the DIN rail.
DC circuits have either Weidmuller terminals (single circuit from a circuit breaker) or Phoenix terminals (with ATCO fuse slots) if it is a sub-circuit from a circuit breaker.
There are several brands of label-makers which can print heat-shrink sleeves with the circuit or wire ID details. I prefer Brady wire/label maker for the heat-shrink sleeves.
My
electrical installation, both AC and DC use DIN rails, BUT, separate rails for AC and DC.
Also, I have a separate set of rails for the
electronics (data/NMEA) circuits.
All DC wires are M22759/16-xx-xx (aviation-grade tinned copper).
The AC rail is earth-bonded.
The DC rails are 0vdc bonded.
An interesting
project to be sure.