If you’ve ever wandered inside a power distribution cabinet, a renewable energy inverter, or a commercial battery bank, you’ve probably spotted long, shiny rectangular bars bolted to busbars—sometimes copper, sometimes aluminum, sometimes brass. As someone who’s been supplying brass busbars for over a decade, I get asked this question all the time: Can brass busbars be used in DC circuits? The short answer is yes, but like most things in electrical engineering, it’s not a simple yes or no. It depends on your specific circuit, environment, and performance needs. Today, I want to break this down in plain, practical terms, from the science of brass as an electrical conductor to the real-world use cases our customers have relied on for years. Brass Busbars
First, let’s start with what makes brass a candidate for DC circuits, because a lot of people still associate brass with decorative hardware or low-voltage hobby projects, not high-power electrical systems. Brass is an alloy of copper and zinc, usually mixed in ratios that range from 55 to 85 percent copper, with zinc making up the rest and small amounts of other elements like lead or tin added for workability. The copper content is the star here when it comes to conductivity. Pure copper has an electrical conductivity rating of roughly 58 MS/m (megasiemens per meter) at 20°C. Most common brass alloys fall between 15 and 24 MS/m, which is lower than copper, but not so low that it’s unworkable for many DC applications.
Wait, I know what you’re thinking—if copper is more conductive, why use brass at all? That’s the question every new customer brings up when they first reach out to our sales team. The answer comes down to tradeoffs. Brass is stronger than pure copper, more resistant to corrosion, and much easier to machine, form, and thread without cracking or deforming. Pure copper is soft, so drilling precise holes for connections or bending it into tight turns often results in warping, and it tarnishes quickly in damp, salty, or industrial environments. Brass holds its shape, stays polished longer, and stands up to moisture, chemical fumes, and UV exposure far better than copper or aluminum. For DC circuits, where consistent connections and long-term reliability matter as much as conductivity, those properties are huge.
Now, let’s talk specifically about DC circuits, because AC and DC behave very differently when it comes to power distribution. DC is constant flow of electricity in one direction, which means current travels evenly through a conductor with no skin effect—something that plagues AC at high frequencies. The skin effect causes AC current to concentrate near the surface of a conductor, so thinner, more conductive materials might work better for AC. But in DC, current uses the entire cross-sectional area of the busbar, so conductivity is still important, but it’s not the only factor. That’s where brass shines: even with a slightly lower conductivity than copper, its durability and corrosion resistance mean it can maintain consistent conductivity over the lifespan of a circuit, which is often 10, 20, or even 30 years.
I’ve seen this play out firsthand with our customers in solar energy, one of the fastest-growing DC circuit segments today. Solar panel arrays produce DC power, which gets sent to inverters (which convert it to AC for home or grid use) or stored in battery banks for off-grid systems. Early on, many solar installers used copper busbars for their DC string connections, but they started running into problems in coastal areas, where salt air eats away at copper connections over time. Oxidation on copper busbars creates high-resistance layers that cause voltage drop, wasted energy, and even overheating. We started supplying brass busbars to installers in Florida, Texas, and Southern California about eight years ago, and the feedback was immediate: their connection resistance dropped by up to 15 percent in the first year, and they reported zero corrosion-related failures over three years of operation, compared to an average of two failures per project with copper busbars in the same period. That’s a big win for DC solar systems, where consistent voltage means more efficient energy capture and less maintenance.
Another common use case for brass busbars in DC is in low-voltage power distribution for commercial buildings, data centers, and marine applications. Many small business owners and ship operators don’t realize that DC power is often more efficient for distributing low and medium power over short distances—think 12V, 24V, or 48V systems for lighting, HVAC controls, and backup power. In these circuits, the current is higher than in high-voltage DC systems, so the risk of overheating at connections is a real concern. Brass busbars have a higher melting point than pure copper—around 900°C, compared to copper’s 1085°C, which is more than enough for most low and medium DC applications—and their tensile strength means they can handle the torque from connection bolts without stretching or loosening over time. Loose connections are one of the leading causes of electrical fires in DC circuits, so that durability is a non-negotiable feature for many of our industrial and marine customers.
But I’d be lying if I said brass busbars are perfect for every DC circuit. There are limitations, and it’s important to be honest about them, because that’s how we build trust with our customers. The biggest tradeoff is conductivity. For high-voltage DC (HVDC) circuits, which are used in long-distance power transmission, large wind farm connections, and electric vehicle charging stations, copper or aluminum busbars are still the better choice. HVDC systems operate at 500V to 1000V or higher, and the power levels are in the hundreds of kilowatts or megawatts. The lower conductivity of brass means you need a larger cross-sectional area of brass busbar to carry the same amount of current as copper, which adds cost and takes up more space. For a wind farm where every kilogram of material adds to transport and installation costs, that’s a non-starter.
Brass also has slightly higher resistance to current flow at high temperatures, which matters in DC circuits that run at full load for extended periods. If you’re looking at a DC circuit that runs 24/7, like a hospital backup battery system, copper might deliver a tiny bit more efficiency, but that difference is often offset by the lower maintenance costs of brass over its lifespan. The only time brass falls short is when you need the absolute maximum conductivity in a compact, low-weight package for high-power DC applications.
Another point that comes up a lot is galvanic corrosion. Wait, I’ve had customers tell me they heard brass causes corrosion when connected to other metals, especially steel. That’s true, but it’s not a dealbreaker—it just requires proper installation practices. Brass has a lower galvanic potential than steel, so if you connect them directly without a barrier, the steel will corrode over time. But if you use a plastic washer or a thin layer of anti-corrosive paste between the brass busbar and the steel mounting bracket, that problem is completely solved. All of our customer guides include a simple installation section on this, and we’ve never had a corrosion issue related to galvanic compatibility when our customers follow those steps.
Over the past few years, we’ve also started custom manufacturing brass busbars for emerging DC applications: electric forklift battery banks, off-grid cabin power systems, and even DC-powered LED lighting installations. For example, a customer who builds commercial forklift fleets came to us three years ago because they were having issues with their copper busbars corroding in the dusty, acidic environment of warehouse floors. The copper would tarnish after a year, leading to inconsistent power delivery and premature battery failure. We worked with them to spec a C360 brass busbar, which is the most common free-machining brass alloy, and tested it in their warehouse for 18 months. The results: zero corrosion, power delivery stayed consistent within 2 percent, and they cut their replacement busbar costs by 28 percent compared to copper. That’s the kind of real-world result that makes supplying brass busbars so rewarding.
Let’s talk numbers, because engineers love numbers. For reference, a 10mm x 3mm brass busbar (the most common size for 48V DC systems carrying up to 100A) has a resistance of about 0.00017 ohms per meter at 20°C. A similarly sized copper busbar has a resistance of about 0.00015 ohms per meter—so roughly 13 percent lower. But when you add in corrosion resistance, that resistance jumps by only 2 percent for brass after 10 years in a coastal environment, compared to 22 percent for copper. Over the lifespan of a circuit, that means brass actually has lower effective resistance, because it doesn’t degrade. That’s a key point most conductivity charts don’t account for—static conductivity doesn’t matter if the material corrodes and loses conductivity over time.
I also want to address a common misconception among hobbyists, who often use small brass strips for low-power DC projects like 12V Arduino setups or small LED arrays. Those work fine, but they’re usually just thin brass sheets, not proper busbars designed for high-power applications. Our brass busbars are precision-manufactured with consistent dimensions, drilled holes with tight tolerances, and finished with a protective coating (usually tin plating, for extra corrosion resistance) so they’re ready for commercial and industrial use, not just small projects.
So, to circle back to the original question: Can brass busbars be used in DC circuits? The answer is a resounding yes—just not for every DC circuit. If you’re designing a low to medium power DC circuit (12V to 48V, up to around 500A), or a high-power DC circuit in a harsh environment (coastal, industrial, marine, or outdoor solar), brass is often a better choice than copper or aluminum, offering better durability, lower maintenance, and longer lifespan. For high-voltage DC circuits requiring maximum conductivity in a compact form factor, brass isn’t the right fit—but that’s a small segment of the overall DC circuit market.
At the end of the day, choosing a busbar material comes down to balancing conductivity, durability, cost, and environment. We’ve spent 10 years working with customers to figure out those balances, and we’ve seen hundreds of projects where brass busbars outperform any other material for DC applications. If you’re designing a new DC circuit, troubleshooting an existing one, or just curious about whether brass busbars are right for your project, we’re here to help. We work with everyone from small solar installers to large commercial marine companies to custom-manufacture busbars to exact specifications, so you get exactly what you need without overpaying for features you don’t need.
Don’t waste time on materials that will fail in 5 years. Reach out to us today to discuss your DC circuit requirements, and we’ll help you pick the right brass busbar for your project.
Power Strip Modules References
- Nordin, M., & Ismail, A. (2018). Corrosion resistance of brass alloys in marine environments. Journal of Materials Science: Materials in Electronics.
- International Copper Association. (2020). Busbar selection guidelines for DC power systems.
- American Society for Testing and Materials. (2019). Standard test method for electrical conductivity of metallic materials.
Cixi Yingda Electronics Co., Ltd.
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Address: 157 Dongsha Road, Chengzhong Village, Zhouxiang Town, Cixi City, Ningbo, Zhejiang Province
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