---
product_id: 548612696
title: "Joinfworld Heavy Duty 500A Bus Bar Waterproof Power Distribution Block with 4*5/16\"(M8)+2*3/8\"(M10) Studs 48V DC Automotive Marine Battery Terminal Distribution Block with Cover - Negative&Positive"
brand: "joinfworld"
price: "17718 kr"
currency: ISK
in_stock: true
reviews_count: 9
category: "Joinfworld"
url: https://www.desertcart.is/products/548612696-joinfworld-heavy-duty-500a-bus-bar-waterproof-power-distribution-block
store_origin: IS
region: Iceland
---

# 500A heavy-duty current rating Water-resistant sealing rings 3/8" & 5/16" stud posts for versatile cable fit Joinfworld Heavy Duty 500A Bus Bar Waterproof Power Distribution Block with 4*5/16"(M8)+2*3/8"(M10) Studs 48V DC Automotive Marine Battery Terminal Distribution Block with Cover - Negative&Positive

**Brand:** joinfworld
**Price:** 17718 kr
**Availability:** ✅ In Stock

## Summary

> ⚡ Elevate your power game with the ultimate 500A bus bar—where strength meets sleek safety.

## Quick Answers

- **What is this?** Joinfworld Heavy Duty 500A Bus Bar Waterproof Power Distribution Block with 4*5/16"(M8)+2*3/8"(M10) Studs 48V DC Automotive Marine Battery Terminal Distribution Block with Cover - Negative&Positive by joinfworld
- **How much does it cost?** 17718 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.is](https://www.desertcart.is/products/548612696-joinfworld-heavy-duty-500a-bus-bar-waterproof-power-distribution-block)

## Best For

- joinfworld enthusiasts

## Why This Product

- Trusted joinfworld brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Safety First Design:** Protective cover and waterproof rings minimize accidental contact and short circuits, ensuring safer circuits.
- • **Premium Build Quality:** Thickened copper bus bar plates and glass fiber reinforced nylon housing deliver durability and reliability.
- • **Powerhouse Performance:** Handles up to 500A and supports 48V DC/300V AC for robust power distribution.
- • **Versatile Connectivity:** Equipped with 2 x 3/8" (M10) and 4 x 5/16" (M8) studs to fit a wide range of cable gauges including 4/0 wires.
- • **Sleek & Organized Setup:** Neatly consolidates wiring for automotive, marine, solar, and RV applications—because your power setup deserves to look as smart as you.

## Overview

The Joinfworld 500A Bus Bar is a heavy-duty, waterproof power distribution block designed for professional-grade electrical setups. Featuring thick copper plates, versatile stud sizes (3/8" and 5/16"), and protective covers with sealing rings, it supports up to 48V DC and 300V AC. Ideal for automotive, marine, solar, and RV applications, it ensures a neat, safe, and reliable power distribution solution favored by professionals.

## Description

desertcart.com: Joinfworld Heavy Duty 500A Bus Bar Waterproof Power Distribution Block with 4*5/16"(M8)+2*3/8"(M10) Studs 48V DC Automotive Marine Battery Terminal Distribution Block with Cover - Negative&Positive : Electronics

Review: Nice busbar - This is a well built busbar that I'm using on the load side of my battery cutoff in my solar install. It says that it is rated at 500A, but according to I = w x t x MF, where MF for CU is 1.2, I get 454A. Close enough for my install. One of the pictures shows 4x3/8" (M10) and 2x5/16" (M8). This is exactly backwards as the two center posts are M10 and the 4 outside ones are M8. The written description is correct. I like how close the posts are, tight, but they minimize distance to keep losses down and my lugs fit fine. The only downside is that mine came missing a few blanks and a few rubber grommets. I would suggest this is water "resistant" rather than water "proof". While the lid fits VERY snug, there isn't any gasket. The busbar is plated and believe this should work well for marine application - just don't submerge! For the money, it's a great value.
Review: Surprisingly high quality - The build quality is surprisingly good. I didn't look for markings to see what kind of plastic it's made from, but it feels a lot like glass fiber reinforced nylon, the type of plastic quality power tools are made from. I expected it to be cheap and flimsy, but it's actually pretty rigid. The box ships with plastic knockouts that slide in and out and fit well enough that you can easily remove them, but they don't just fall out when you let go, so they're very convenient to work with. It also ships with grommets you can cut to suit your needs. I expected to get something that would work well enough and I'd just tuck it in a corner, but the quality is high enough that I'd be happy with it being displayed in a prominent location.

## Features

- 500A Heavy Duty: The 12V Bus Bar rated 500A, besides, this power bus bar junction block can work with MAX 48V DC & 300V AC. Each power busbar will come with a protect cover and nuts, which helps to shelter as much exposed area as possible to reduce the risks of accidental contact and prevent short circuit, makes the circuit safer
- Upgrade & Thicken: A pair of 12v power distribution block, includes a red and a black power distribution block(Positive&Negative). Our 12v 500 amp bus bar also features Thicker Copper Bus Bar Plate which can be connected to wider range of cables
- 3/8" & 5/16" Studs: The Power Distribution Block Bus Bar with 2 x 3/8" (M10) and 4 x 5/16"(M8) stud posts, which makes the 12V terminal block be able to accept 4/0 Gauge wires and terminals. The size of the terminal can be selected, which is more convenient
- Waterproof: The 500 amp copper battery bus bar comes with waterproof rings, which can act as a sealing function, so it makes your wiring more secure and reliable. This set of red and black busbar also comes with removable plates, it let the wires&terminals go through very easy and prevent short circuit
- Wide Application - The 500A Heavy Duty Power Distribution Block makes the wiring of circuit become neat and tidy and prevent electric short circuit, suitable for automotive, car, truck, marine, boat, RV, Solar, etc.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0C33H7RTX |
| Best Sellers Rank | #21 in Distribution Connecting Blocks |
| Customer Reviews | 4.6 4.6 out of 5 stars (131) |
| Date First Available | April 20, 2023 |
| Item Weight | 2.3 pounds |
| Item model number | BB500-T6M8X4M10X2-RB |
| Manufacturer | Joinfworld |
| Product Dimensions | 5.4 x 5.4 x 2.7 inches |

## Product Details

- **Brand:** Joinfworld
- **Color:** Red&Black
- **Compatible Devices:** Boat, Car, Marine, RV, Solar, Truck
- **Connector Type:** Crimp
- **Item dimensions L x W x H:** 5.4 x 5.4 x 2.7 inches

## Images

![Joinfworld Heavy Duty 500A Bus Bar Waterproof Power Distribution Block with 4*5/16"(M8)+2*3/8"(M10) Studs 48V DC Automotive Marine Battery Terminal Distribution Block with Cover - Negative&Positive - Image 1](https://m.media-amazon.com/images/I/71oOMPneFmL.jpg)

## Available Options

This product comes in different **Style** options.

## Questions & Answers

**Q: Is the conductive material solid copper?**
A: Yes, Copper Nickel Plated Plate with Stainless Steel Studs and Nuts.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Nice busbar
*by F***D on September 6, 2025*

This is a well built busbar that I'm using on the load side of my battery cutoff in my solar install. It says that it is rated at 500A, but according to I = w x t x MF, where MF for CU is 1.2, I get 454A. Close enough for my install. One of the pictures shows 4x3/8" (M10) and 2x5/16" (M8). This is exactly backwards as the two center posts are M10 and the 4 outside ones are M8. The written description is correct. I like how close the posts are, tight, but they minimize distance to keep losses down and my lugs fit fine. The only downside is that mine came missing a few blanks and a few rubber grommets. I would suggest this is water "resistant" rather than water "proof". While the lid fits VERY snug, there isn't any gasket. The busbar is plated and believe this should work well for marine application - just don't submerge! For the money, it's a great value.

### ⭐⭐⭐⭐⭐ Surprisingly high quality
*by D***D on September 2, 2025*

The build quality is surprisingly good. I didn't look for markings to see what kind of plastic it's made from, but it feels a lot like glass fiber reinforced nylon, the type of plastic quality power tools are made from. I expected it to be cheap and flimsy, but it's actually pretty rigid. The box ships with plastic knockouts that slide in and out and fit well enough that you can easily remove them, but they don't just fall out when you let go, so they're very convenient to work with. It also ships with grommets you can cut to suit your needs. I expected to get something that would work well enough and I'd just tuck it in a corner, but the quality is high enough that I'd be happy with it being displayed in a prominent location.

### ⭐⭐⭐⭐⭐ Quality
*by A***E on February 2, 2026*

Quality product

## Frequently Bought Together

- Joinfworld Heavy Duty 500A Bus Bar Waterproof Power Distribution Block with 4*5/16"(M8)+2*3/8"(M10) Studs 48V DC Automotive Marine Battery Terminal Distribution Block with Cover - Negative&Positive
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*Product available on Desertcart Iceland*
*Store origin: IS*
*Last updated: 2026-03-01*