Good day everyone,
I'm currently helping with some of the circuit design in my company. Unfortunately I am not very experienced with the protection of individual circuits.
We are trying to power three identical circuits with one power supply. We are using phoenix contact terminal blocks.
To protect it, I was thinking of going from the power Supply to a larger fuse rated at 16A slow blow, then going from that fuse to three separate fuses at 6.3A each.
To get the 12V from the power supply to all three terminal blocks, I simply wanted to place one of those red terminal block bridges, but I now realize that this might interfere with the fuses. When I build the terminal block like that, and I try to measure the continuity, I get continuity across all fuse terminals on both ends, meaning there is no separation between the three circuits.
Would anyone here be able to help me design this terminal block in such a way that I get three separately protected circuits?
I've also attached two images, one being a bad attempt at an MS paint schematic, the other showing the terminal fuse blocks I am using.

Thanks in advance!

 

There is seldom any need to fuse both sides of a power supply, and since you are fusing each load there us no benefit for fusing the single feed to those fuses, UNLESS that segment of wiring may be subject to physical damage. But if the fuses are all near the source feed then one fuse per load is all that you need.

 

High voltage, >50v, should be fused in any/all supply conductor(s) that is not referenced to earth GND.
LV can be fused one side.

 

There are standards for fusing power circuits, I suggest that the TS investigate those standards.

 

A good reference to start with when working with electrical enclosures is NFPA79.