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The Jamgoer 300A Heavy Duty Bus Bar is a compact, waterproof power distribution block designed for 12V to 48V DC systems. Featuring four M8 terminal studs, a corrosion-resistant brass and nickel-plated bus, and a reinforced nylon base, it ensures reliable, high-current connections for marine, automotive, RV, and truck applications. Its weatherproof construction and smart design elements like non-slip padding and labeling space make it a must-have for professional-grade electrical setups.












| ASIN | B092Q3JBKD |
| Best Sellers Rank | #95,944 in Electronics ( See Top 100 in Electronics ) #44 in Distribution Connecting Blocks |
| Brand Name | jamgoer |
| Centerline Length | 138 Millimeters |
| Color | M8 Red |
| Colour | M8 Red |
| Connector Type | Screw |
| Connector type | Screw |
| Current Rating | 300 Amps |
| Current rating | 300 Amps |
| Customer Reviews | 4.8 out of 5 stars 272 Reviews |
| Item Dimensions W x H | 6.9W x 4.5H centimeters |
| Manufacturer | jamgoer |
| Material | Brass , Nickel |
| Material Type | Brass, Nickel |
| Model | JG-DB300-4 |
| Mounting Type | Panel Mount |
| Mounting type | Panel Mount |
| Number Of Contacts | 4 |
| Number Of Poles | 4 |
| Number of Positions | 4 |
| Number of contacts | 4 |
| Part Number | FBA-HX4-F3607-R |
| Specification Met | IEC |
| UPC | 699993229033 |
| Unit Count | 1.0 Count |
| Voltage | 48 Volts |
C**.
Great value for the money.
These worked great for my electrical upgrade on my RV. Add solar panels and controllers. Needed more posts. Quality is great. And the price was right.
G**R
A nice bus bar
This is a well made, reasonably priced bus bar. I used it for making neat, clean connections for my negative cables on my RV.
A**O
Good looks better quality.
I bought these blocks when I was installing my inverter into my travel trailer to help organize and keep a clean look to my install and these did just that. the quality of the plastic and metal is top notch and they look so good. I'll have to get some photos of my inverter system install attached to this review in the future. but until then, take my word for it. These are nice. Highly recommend.
A**R
Works for my Solar package
Decent quality for a good price
E**E
Definitely Heavy Duty
This bus bar does not disappoint. These are very heavy duty bus bars that you can tell are high quality by the weight of them alone. Very thick, solid piece of metal. The thickness alone will help with voltage drops and reduce the risk of fire in a high amperage system. It comes with all the necessary mounting hardware. The wire gaps in the cover appear to be large enough for 0/1 gauge wire. The 8 x M4(#8) studs will be great for connecting any low voltage 12v sources. Ill be using it to run my lights in my shed. Price might be a factor as they are on the expensive side but there's not much you cant throw at these in a 12v system. These are defiantly a buy If your looking for something to handle high amps or just like to be overly cautious like me. This is exactly what I was looking for to connect my battery banks.
Trustpilot
5 days ago
1 day ago