---
product_id: 645825904
title: "Heavy Duty Bus Bar 300A 12V Power Distribution Block with 5/16\" (M8) 4-Posts Terminals Block with Cover for Automotive, Marine, Battery System (Black & Red)"
brand: "uckasayfy"
price: "€ 82.82"
currency: EUR
in_stock: true
reviews_count: 13
category: "U Ckasayfy"
url: https://www.desertcart.hr/products/645825904-heavy-duty-bus-bar-300a-12v-power-distribution-block-5
store_origin: HR
region: Croatia
---

# 300A max current V-0 flame-retardant nylon housing 4 x 5/16" M8 stud terminals Heavy Duty Bus Bar 300A 12V Power Distribution Block with 5/16" (M8) 4-Posts Terminals Block with Cover for Automotive, Marine, Battery System (Black & Red)

**Brand:** uckasayfy
**Price:** € 82.82
**Availability:** ✅ In Stock

## Summary

> ⚡ Power up your setup with confidence and style!

## Quick Answers

- **What is this?** Heavy Duty Bus Bar 300A 12V Power Distribution Block with 5/16" (M8) 4-Posts Terminals Block with Cover for Automotive, Marine, Battery System (Black & Red) by uckasayfy
- **How much does it cost?** € 82.82 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/645825904-heavy-duty-bus-bar-300a-12v-power-distribution-block-5)

## Best For

- uckasayfy enthusiasts

## Why This Product

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

## Key Features

- • **Rock-Solid Safety:** Vibration-resistant design with flame-retardant housing ensures ultimate protection and reliability.
- • **Premium Conductivity:** 6mm-thick nickel-plated copper bus bar minimizes resistance for stable, efficient power flow.
- • **Powerhouse Performance:** Handles a robust 300A current at 12V for seamless high-capacity power distribution.
- • **Built to Last & Support:** Crafted with precision and backed by excellent after-sales service for worry-free installation and use.
- • **Effortless Organization:** 4 large stud terminals keep your wiring neat and centralized, eliminating clutter in automotive and marine setups.

## Overview

The UCkasayfy Heavy Duty Bus Bar is a 12V, 300A-rated power distribution block featuring a durable nickel-plated copper bus bar and flame-retardant nylon housing. Designed for automotive, marine, and battery systems, it offers 4 large M8 stud terminals for organized, high-capacity connections, ensuring safe, vibration-resistant, and efficient power management.

## Description

Buy UCkasayfy Heavy Duty Bus Bar 300A 12V Power Distribution Block with 5/16" (M8) 4-Posts Terminals Block with Cover for Automotive, Marine, Battery System (Black & Red): Connecting Blocks - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Well made product - Well made , at a great price. Exactly what I need to take care of my problem.
Review: Using in my RV for the Negative Buss - I'm using the black one in my RV for my 12 volt negative buss. I have the blue sea MRBF fuse buss on the positive side. I've run it all season with no problems. It was easy to install and it cleaned up my battery compartment which was a mess of wires all bolted on the battery posts. I have 1/0 cable running to a Victron 300A current shunt and then to the batteries from this. On the buss bar I have the solar, rv coach panel, and the generator start circuit on it. All current flows through the shunt so it can monitor the battery state of charge effectively. I would buy it again.

## Features

- 【Safety & Reliability】——Engineered for vibration resistance and electrical safety, this distribution block features secure flange nut terminals and a V-0 flame-retardant nylon housing with full protective cover. This robust design effectively prevents terminal loosening and short circuits, delivering worry‑free performance in automotive, marine, and mobile power applications
- 【Premium Conductivity】——At its core is a 6mm-thick nickel-plated copper bus bar for minimal resistance and stable performance, as this 12V bus bar reliably carries a 300A rating at 12V with a maximum voltage of 48V DC
- 【High-Capacity Connections】——Equipped with 4 x 5/16″ (M8) stud terminals. this battery bus bar supports large size terminal connectors and wires to integrate multiple devices into a centralized, space-saving hub for efficient power distribution
- 【Organized Power Solution】——This 12 volt bus bar with cover is the ideal power distribution block to organize messy wiring and prevent a messy harness, being particularly suitable for automotive, car, truck, marine, boat, and solar wiring applications
- 【After-sales Service】——Exquisite craft, strict quality control and excellent after-sales service that is why our products worth your purchase

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0CNYQVLWQ |
| Best Sellers Rank | #79 in Distribution Connecting Blocks |
| Brand | UCkasayfy |
| Color | Black & Red |
| Connector Type | Screw |
| Current Rating | 300 Amps |
| Date First Available | January 3, 2024 |
| Item Weight | 1.67 pounds |
| Item model number | UCXXXX |
| Manufacturer | UCkasayfy |
| Material | Nylon |
| Mounting Type | DIN Rail Mount |
| Number Of Contacts | 4 |
| Number Of Poles | 4 |
| Package Dimensions | 6.02 x 4.29 x 3.07 inches |
| Specification Met | True |
| Voltage | 12 Volts |

## Product Details

- **Brand:** UCkasayfy
- **Color:** Black & Red
- **Connector Type:** Screw
- **Current Rating:** 300 Amps
- **Material:** Nylon
- **Mounting Type:** DIN Rail Mount
- **Number Of Contacts:** 4
- **Number Of Poles:** 4
- **Specification Met:** True
- **Voltage:** 12 Volts

## Images

![Heavy Duty Bus Bar 300A 12V Power Distribution Block with 5/16" (M8) 4-Posts Terminals Block with Cover for Automotive, Marine, Battery System (Black & Red) - Image 1](https://m.media-amazon.com/images/I/41P+n8AYXtL.jpg)
![Heavy Duty Bus Bar 300A 12V Power Distribution Block with 5/16" (M8) 4-Posts Terminals Block with Cover for Automotive, Marine, Battery System (Black & Red) - Image 2](https://m.media-amazon.com/images/I/41W3bntD0mL.jpg)
![Heavy Duty Bus Bar 300A 12V Power Distribution Block with 5/16" (M8) 4-Posts Terminals Block with Cover for Automotive, Marine, Battery System (Black & Red) - Image 3](https://m.media-amazon.com/images/I/41zfXT81S8L.jpg)
![Heavy Duty Bus Bar 300A 12V Power Distribution Block with 5/16" (M8) 4-Posts Terminals Block with Cover for Automotive, Marine, Battery System (Black & Red) - Image 4](https://m.media-amazon.com/images/I/513ScMMzXNL.jpg)
![Heavy Duty Bus Bar 300A 12V Power Distribution Block with 5/16" (M8) 4-Posts Terminals Block with Cover for Automotive, Marine, Battery System (Black & Red) - Image 5](https://m.media-amazon.com/images/I/51Cm72a5epL.jpg)

## Questions & Answers

**Q: Is this Bus Bar suitable for small solar systems?**
A: Yes, it is well-suited for small solar systems, providing safe and efficient power distribution.

**Q: Can it be used for automotive modifications?**
A: Yes, it can be used for automotive electrical system modifications, but please ensure sufficient installation space.

**Q: What is the current-carrying capacity of the product?**
A: It offers various options ranging from 250A to 600A to meet different power requirements, with excellent load-bearing performance. Please check the bottom of the product details page for specific options.

**Q: Is the product size too large?**
A: The product dimensions are clearly listed on the details page. Please verify the installation space before purchasing.

**Q: Does it support both M8 and M10 bolt specifications?**
A: Yes, the product comes in multiple specifications (e.g., 5/16" M8 and 3/8" M10) to accommodate different needs. Please check the bottom of the product details page for available options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Well made product
*by T***D on December 26, 2025*

Well made , at a great price. Exactly what I need to take care of my problem.

### ⭐⭐⭐⭐⭐ Using in my RV for the Negative Buss
*by P***L on October 12, 2025*

I'm using the black one in my RV for my 12 volt negative buss. I have the blue sea MRBF fuse buss on the positive side. I've run it all season with no problems. It was easy to install and it cleaned up my battery compartment which was a mess of wires all bolted on the battery posts. I have 1/0 cable running to a Victron 300A current shunt and then to the batteries from this. On the buss bar I have the solar, rv coach panel, and the generator start circuit on it. All current flows through the shunt so it can monitor the battery state of charge effectively. I would buy it again.

### ⭐⭐⭐⭐ Cleaned up battery compartment
*by T***L on September 30, 2025*

Installed on my boat instead of having multiple wires on the battery. Cleaned up the process of changing my battery nicely. The are heavy duty and have a waterproof cover. Installed easy and have been working fine for a couple of months now

## Frequently Bought Together

- Heavy Duty Bus Bar 300A 12V Power Distribution Block with 5/16" (M8) 4-Posts Terminals Block with Cover for Automotive, Marine, Battery System (Black & Red)
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**Shop now:** [https://www.desertcart.hr/products/645825904-heavy-duty-bus-bar-300a-12v-power-distribution-block-5](https://www.desertcart.hr/products/645825904-heavy-duty-bus-bar-300a-12v-power-distribution-block-5)

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-02-04*