300A 58V Terminal Mount Fuse Block Kit with Single Stud 5/16"(M8) Marine Rated Battery Fuse and Waterproof Cap for Cars, New Energy trams, RVs,Truck,Boat,Cruise Ships,and Other DC Main Power Sources

A very well-built fuse block, which connects directly to the battery terminal (and hence no wiring between battery and fuse, which could be a potential source of problems with high-current applications).These are mostly used in marine applications, but I've employed mine on my solar battery bank. At 300A it can easily sit between my batteries (12.8V) and inverter (3000W).I find the design of these fuses rather odd - the circular centre of the fuse connects through the top and bottom with the fuse in the middle of the square fuse block. The terminal fuse holder then has an isolated screw that goes through the centre of the fuse to contact the top ring, while the terminal connector itself joins to the battery and contacts the bottom ring of the fuse.But it works, and it means that everything that comes off my battery is fused without having to run a (unfused) cable to a fuse block of some kind.I will be buying some more to put on each individual battery too, as I think that would prevent any inter-battery short or problem (e.g. if one battery is far more discharged than the others).

This arrived and I thought how small it was, rated at 300Amps and 58volt. I have mounted it to protect my 20kW of storage batteries. I hope it will do just that, its got an 8mm stud and 8mm mounting hole too. The fuse itself is on a ceramic block enclosed with clear plastic so you can get a visual on the state of the fuse. Its working fine and passing current, my only concern is that if an over current situation were to happen and the fuse were to blow, I wonder if the limited air gap created by the fuse rupturing would be enough to stop an arc being formed to bridge the small gap and keep the fault going on?Anyway I have other fusible links in circuit so hopefully I wont find out. So far happy to have mine.