---
product_id: 803629808
title: "Joinfworld 400A Bus Bar Power Distribution Block 12V with 4 x 3/8\" (M10) Terminal Studs and 3 Terminal Screws 12 Volt Marine Bus Bar Positive & Negative for Boat, Automotive, RV, Solar System"
brand: "joinfworld"
price: "$139.17"
currency: USD
in_stock: true
category: "Joinfworld"
url: https://www.desertcart.us/products/803629808-joinfworld-400a-bus-bar-power-distribution-block-12v-with-4
store_origin: US
region: United States of America
---

# 400A max current capacity 4 x 3/8" heavy-duty terminal studs Protective cover reduces short circuit risk Joinfworld 400A Bus Bar Power Distribution Block 12V with 4 x 3/8" (M10) Terminal Studs and 3 Terminal Screws 12 Volt Marine Bus Bar Positive & Negative for Boat, Automotive, RV, Solar System

**Brand:** joinfworld
**Price:** $139.17
**Availability:** ✅ In Stock

## Summary

> ⚡ Power your projects with precision and safety — don’t get left in the dark!

## Quick Answers

- **What is this?** Joinfworld 400A Bus Bar Power Distribution Block 12V with 4 x 3/8" (M10) Terminal Studs and 3 Terminal Screws 12 Volt Marine Bus Bar Positive & Negative for Boat, Automotive, RV, Solar System by joinfworld
- **How much does it cost?** $139.17 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/803629808-joinfworld-400a-bus-bar-power-distribution-block-12v-with-4)

## 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

- • **Robust Copper Core:** 8mm thick copper bus bar ensures superior conductivity and durability.
- • **Secure Connections:** Four 3/8" stainless steel studs plus three #10 screw terminals for versatile wiring.
- • **Tidy & Trustworthy:** Nylon base with M10 post secures the bus bar firmly, keeping your wiring neat and reliable.
- • **Safety First Design:** Includes protective cover and nuts to minimize accidental contact and short circuits.
- • **Power Through with Confidence:** Handles up to 400A at 48V DC/300V AC for heavy-duty applications.

## Overview

The Joinfworld 400A Bus Bar Power Distribution Block is a heavy-duty 12V solution designed for marine, automotive, RV, and solar systems. Featuring an 8mm thick copper bus bar, four 3/8" stainless steel terminal studs, and a protective cover, it supports up to 400A current at 48V DC or 300V AC. Its secure nylon base and included nuts ensure stable, safe, and tidy wiring, making it an essential upgrade for professionals demanding reliability and clean circuit management.

## Description

Product Description Heavy Duty 400A Power Distribution Block 400A Heavy Duty: The 12V Bus Bar rated 400A, besides, this power distribution block can work with MAX 48V DC & 300V AC. 3/8" Stud Terminal - The battery copper bus bar terminal block includes 4 x 3/8" studs and 3 x #10(M5) screw terminals, which makes the 12V junction block able to accept larger size terminal connectors and wires. Product Details Display 3/8" Stud Terminal The 12v bus bar is 4 x 3/8"(M10) studs and 3 x #10(M5) screw terminals design, can allow max 400A current pass through the battery terminal block. 8mm Thickened Copper Bar Our 400A bus bar comes with 8MM Thicker Copper Bus Bar Plate, which can be connected to wider range of cables and withstand up to 400A 48V DC/300V AC. Protect Cover & Nuts Each buss bar 12v will come with a cover and two nuts, which will reduce the risks of short circuit or touch. It also makes the wiring neat and clean. Solid Nylon Base The nylon bottom is secured by 3/8"(M10) post stud, which is more fixed and won't strip. OURS vs OTHERS

## Features

- Heavy Duty: This 12 volt marine bus bar is 400A large current design, heavy duty positive and negative busbar for max 48V DC or 300V AC systems.
- Superior Material: The 400A bus bar terminal block features 8mm(0.32") thicker copper bus bar plate with stainless steel studs and nuts. Red Positive Busbar and Black Negative(Ground) bus bar as a pair.
- 3/8" Stud Terminal: The battery copper bus bar terminal block includes 4 x 3/8" studs and 3 x #10(M5) screw terminals, which makes the 12V junction block able to accept larger size terminal connectors and wires. The nylon bottom is also secured by M10 post which makes it more fixed and won't strip.
- Unique Cover & Nuts: Each power busbar will come with a protect cover and two 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.
- Wide Application: The 12 volt buss bar with cover aims to make the wiring of circuit become neat and tidy, preventing mess harness from causing electric short circuit, it is suitable for automotive, car, truck, marine, boat, solar wiring.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0G2LGXVJ8 |
| Best Sellers Rank | 47,935 in DIY & Tools ( See Top 100 in DIY & Tools ) 62 in Terminal Blocks (DIY & Tools) |
| Brand | Joinfworld |
| Connector Type | Screw |
| Connector type | Screw |
| Country Of Origin | China |
| Gauge | 1.0 |
| Included Components | one positive bus bar and one ground bus bar |
| Item Dimensions W x H | 16.5W x 4.9H centimetres |
| Manufacturer | Joinfworld |
| Number Of Contacts | 7 |
| Number of contacts | 7 |
| Product dimensions | 16.5W x 4.9H centimetres |
| Specification Met | CE |
| Specification met | CE |

## Images

![Joinfworld 400A Bus Bar Power Distribution Block 12V with 4 x 3/8" (M10) Terminal Studs and 3 Terminal Screws 12 Volt Marine Bus Bar Positive & Negative for Boat, Automotive, RV, Solar System - Image 1](https://m.media-amazon.com/images/I/71lO4n9o1wL.jpg)
![Joinfworld 400A Bus Bar Power Distribution Block 12V with 4 x 3/8" (M10) Terminal Studs and 3 Terminal Screws 12 Volt Marine Bus Bar Positive & Negative for Boat, Automotive, RV, Solar System - Image 2](https://m.media-amazon.com/images/I/71Q7a+8QIGL.jpg)
![Joinfworld 400A Bus Bar Power Distribution Block 12V with 4 x 3/8" (M10) Terminal Studs and 3 Terminal Screws 12 Volt Marine Bus Bar Positive & Negative for Boat, Automotive, RV, Solar System - Image 3](https://m.media-amazon.com/images/I/71kxtEMPJGL.jpg)
![Joinfworld 400A Bus Bar Power Distribution Block 12V with 4 x 3/8" (M10) Terminal Studs and 3 Terminal Screws 12 Volt Marine Bus Bar Positive & Negative for Boat, Automotive, RV, Solar System - Image 4](https://m.media-amazon.com/images/I/81rF0dzjQLL.jpg)
![Joinfworld 400A Bus Bar Power Distribution Block 12V with 4 x 3/8" (M10) Terminal Studs and 3 Terminal Screws 12 Volt Marine Bus Bar Positive & Negative for Boat, Automotive, RV, Solar System - Image 5](https://m.media-amazon.com/images/I/711CGc+TqML.jpg)

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-03-06*