MOFEEZ Power Distribution Block Bus Bar, 4 x 3/8" Posts, 6 x #8 Screws Terminals, Max 48V 250A

Why I picked up the Mofeez bus bar

I installed the Mofeez bus bar while refitting the 12/24V electrical system in a camper and needed something tidy, robust, and straightforward for splitting power and ground. The unit is actually a pair of blocks—one red and one black—each with four 3/8" studs for heavy-gauge runs and six #8 screw terminals for smaller circuits. On paper, it’s rated for up to 48 V DC and 250 A continuous across the whole bar, with a removable cover, nickel-plated brass conductors, and a flame-retardant nylon base. I wanted a compact bus that could handle real current without turning into a spaghetti bowl of ring lugs. After a few weeks of use, here’s how it fared.

Build and materials

The construction hits the right notes for automotive and marine environments. The bus plates are nickel-plated brass—low resistance, plenty of conductivity, and corrosion protection if you’re around salt or humidity. The base is insulated nylon and feels sturdy rather than brittle, which matters when you’re snugging down hardware in tight spaces. The studs are true 3/8" and the six auxiliary terminals use stainless #8 screws, each with a captive channel that keeps small ring terminals aligned as you tighten.

The cover is clear enough to see your labeling and connections, and it’s not flimsy. It secures over the assembly to reduce accidental shorts from tools or stray wires. Nylon retaining nuts help keep exposed metal to a minimum once the cover is on. Overall fit and finish are better than I expected at this price.

Physically, each block is compact (roughly 6.7" L x 1.3" W x 2.1" H), which gave me enough room to mount two in parallel on a narrow panel. The footprint is friendly for vans, small boats, and RV utility compartments.

Installation experience

Install was painless. I used the four 3/8" studs for the primary feeds: one connection to the battery via a fused link, one to an inverter/charger, one to a secondary fuse panel, and one held in reserve. The six #8 screws took care of lighter loads and signal gear (comms, lighting zones, sensor grounds). The layout keeps heavy cables away from the smaller terminations, so tools aren’t bumping into delicate runs as you torque the big lugs.

A few practical notes:
- The 3/8" studs are large by design. If you’re running smaller wire gauges, make sure you’ve got the correct ring terminals with 3/8" eyes. If you try to use a tiny ring with a reducer sleeve, you’ll end up with a sloppy stack.
- With very large lugs (think 2/0–4/0 cable), clearance under the cover gets tight. On one install with 4/0 lugs, I had to rethink stack height and clock the lugs to get the cover to seat cleanly. Right-angle lugs or low-profile rings help.
- The #8 screw terminals are great for small circuits; just don’t expect them to carry starter-level currents. They’re best for low-amp branch circuits or control feeds.

Mounting was straightforward. The insulated base meant I felt comfortable anchoring it to a metal bulkhead without adding an isolation plate, though I still made sure no metal edges could chafe incoming cables.

Performance and electrical behavior

I’ve run the bus at a system level up to roughly 150–180 A continuous through the heavy studs (inverter + DC loads) without any meaningful temperature rise at the bars themselves. Connections stayed secure, and voltage drop across the bar was negligible. That’s exactly what I want from a distribution block: to forget it’s there.

The spec sheet calls out 250 A continuous for the entire bar and up to 48 V DC, which covers typical 12/24V vehicle and marine systems and some 48V applications. There’s also a note about a 20 A maximum intermittent per connection (less than a minute). In practice, I treat that as guidance for the small #8 screw terminals, not the 3/8" studs. My rule has been:
- High-current consumers and feeders go on the 3/8" studs.
- The #8 screws handle low-amp accessories, sensors, and lighting branches.

Sticking to that logic keeps everything well within spec, and it’s how this block really shines.

Safety and serviceability

A few design choices made me comfortable using this in cramped spaces:
- The removable cover reduces risk of accidental shorts from tools or cable droop.
- Nylon retaining nuts minimize exposed conductive surfaces around the studs.
- The nickel-plated brass is forgiving in damp environments and hasn’t tarnished after exposure to condensation and occasional salt spray.

From a service perspective, labeling is easy. There’s enough visual separation to mark each stud and screw terminal so future you (or somebody else) can diagnose without pulling wires. The clear cover helps you verify connections at a glance.

Use cases that fit well

• RVs and camper vans: Perfect for building a clean positive and negative distribution point near a battery or DC-DC charger.
• Small boats: The corrosion resistance and covered design suit helm or locker installations. Pairing one red and one black unit keeps the system tidy and reduces ground daisy-chaining.
• Auxiliary systems in trucks/UTVs: Good for lighting, compressors, winches (studs for main feeds, screws for relay triggers), as long as the main winch current doesn’t route through the small terminals.

If you’re building a negative return scheme that brings everything back to a single point near the battery, the black bus is a nice way to avoid chasing grounds through a chassis.

Limitations and quirks

• Cover clearance with large lugs: If you’re terminating big cable (2/0–4/0) with heavy ring lugs, plan your rotation carefully. In a couple of cases, I had to change to lower-profile lugs to keep the cover happy.
• Stud size vs. small-gauge wiring: The 3/8" studs are fantastic for current capacity, but you’ll need the correct ring terminals for small wire gauges. Keep a set of small-gauge, 3/8" eye ring terminals on hand to avoid ugly adapters.
• Per-connection current on the #8 screws: Think of those as distribution for low-amp circuits. If you try to push mid/high current through the small screws, you’re misusing the block.

None of these are deal-breakers, but they’re worth planning for.

Tips for a clean, reliable install

• Use appropriately sized ring terminals: 3/8" eyes for the studs; #8 ring terminals for the screws. Avoid stacking too many lugs on one stud.
• Clock your lugs: Aim cable exits in alternating directions to reduce stack height and improve cover fit.
• Protect feeds with proper fusing: Fuse your primary positive feed close to the battery. The bus bar is not a fuse; it’s a junction.
• Strain relief matters: Secure incoming cables so the bus isn’t taking mechanical load from heavy wires.
• Label everything: Future troubleshooting is much easier when each stud and screw terminal is documented.

Value and alternatives

Compared to premium marine bus bars from brands like Blue Sea Systems, the Mofeez bus bar offers similar functionality and ratings at a noticeably lower price. You give up some of the brand cachet and perhaps a bit of polish in accessory options, but the core performance and build materials are solid. For most 12/24V builds that need both heavy and light distribution on a compact footprint, this is excellent value.

If you’re running sustained currents well above 250 A or need massive cable stacking with protective caps that clear 4/0 lugs without fuss, you might look at larger-format bus bars designed for high-density terminations. For everyone else, this hits a sweet spot.

The bottom line

I’d recommend the Mofeez bus bar. It’s a well-built, compact distribution block with the right combination of heavy studs and small terminals, genuine materials where it counts, and a thoughtful cover that improves safety without making service a chore. It handled real current in my build without heat or drama, kept the wiring tidy, and survived a few careless wrench slips without sparking a scare. Its few quirks—mainly cover clearance with very large lugs and the need for properly sized small-ring terminals—are easy to plan around. For RVs, boats, and vehicle upfits that need reliable DC distribution up to 48 V and around 250 A continuous, it delivers dependable performance at a fair price.