{"product_id":"275a-400a-dual-power-distribution-bus-bar-kit","title":"Dual Power Distribution Bus Bar Kit (M8 5\/16\")","description":"\u003cdiv role=\"region\" aria-label=\"275A and 400A Dual Bus Bar Kit\" class=\"sapphire-product-description\"\u003e\n\u003c!-- Title --\u003e\n\u003ch2 class=\"sapphire-title\"\u003eDual High-Current Power Distribution Bus Bar Kit\u003c\/h2\u003e\n\u003chr class=\"sapphire-hr\"\u003e\n\u003c!-- Intro --\u003e\n\u003cp class=\"sapphire-p\"\u003eCompact, professional power distribution for RVs, boats, vans, service vehicles, and off-grid electrical systems. Built with tinned copper bars, rated for up to 48VDC Systems. Choose between \u003cstrong\u003e275A\u003c\/strong\u003e and \u003cstrong\u003e400A\u003c\/strong\u003e versions to match the demands of your installation.\u003c\/p\u003e\n\u003cp class=\"sapphire-p\"\u003eEach kit includes a red positive bus bar and a black negative bus bar, with \u003cstrong\u003e4 × M8 (5\/16\") main studs\u003c\/strong\u003e and \u003cstrong\u003e6 × M4 (#8) accessory screws\u003c\/strong\u003e on each bar. This mixed-terminal layout keeps high-current battery and inverter cables organized while providing convenient connection points for smaller charging, monitoring, and distribution circuits.\u003c\/p\u003e\n\u003cdiv class=\"sapphire-callout sapphire-callout-yellow\"\u003e\n\u003cdiv class=\"sapphire-callout-title\"\u003eWhy M8 (5\/16\") Studs?\u003c\/div\u003e\n\u003cp class=\"callout-p\"\u003eWe intentionally choose \u003cstrong\u003eM8 (5\/16\") studs\u003c\/strong\u003e because they're the industry standard on most lithium batteries, fuse holders, inverters, and other DC power equipment. This reduces the need for custom battery cables while still accepting standard cable lugs with either \u003cstrong\u003e5\/16\"\u003c\/strong\u003e or \u003cstrong\u003e3\/8\"\u003c\/strong\u003e mounting holes. \u003c\/p\u003e\n\u003cp class=\"callout-p\"\u003eBetter flexibility.  Easier Install.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- Why you'll love it --\u003e\n\u003ch3 class=\"sapphire-section-title\"\u003eWhy You’ll Love It\u003c\/h3\u003e\n\u003chr class=\"sapphire-hr\"\u003e\n\u003cul class=\"sapphire-checklist\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eChoose the capacity you need:\u003c\/strong\u003e Available in 275A and 400A continuous-current versions for everything from compact auxiliary systems to demanding inverter and charging installations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTinned copper construction:\u003c\/strong\u003e Delivers excellent conductivity with added corrosion resistance for dependable use in RV, marine, automotive, and off-grid environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM8 main studs:\u003c\/strong\u003e Matches the terminal size commonly used on lithium batteries and other DC equipment, while also accepting cable lugs with 3\/8\" mounting holes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMixed wiring made easy:\u003c\/strong\u003e Four main studs handle large battery, inverter, charger, and distribution cables, while six accessory screws provide dedicated connection points for smaller circuits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesigned to maximize every terminal:\u003c\/strong\u003e The studs and accessory screws are spaced to allow compatible ring terminals to be installed on both at the same time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete positive and negative kit:\u003c\/strong\u003e Includes one red and one black bus bar, insulating covers, and mounting hardware for a clean, color-coded installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- Great for --\u003e\n\u003ch3 class=\"sapphire-section-title\"\u003eGreat For\u003c\/h3\u003e\n\u003chr class=\"sapphire-hr\"\u003e\n\u003cp class=\"sapphire-p\"\u003eBattery banks, inverter systems, solar installations, DC distribution panels, marine and RV power centers, service vehicles, overland builds, and other 12V–48V systems requiring clean, high-current power distribution.\u003c\/p\u003e\n\u003c!-- Specifications --\u003e\n\u003ch3 class=\"sapphire-section-title\"\u003eSpecifications\u003c\/h3\u003e\n\u003chr class=\"sapphire-hr\"\u003e\n\u003ctable role=\"table\" aria-label=\"Specifications for 275A and 400A Dual Bus Bar Kit\" class=\"sapphire-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eContinuous Rating\u003c\/th\u003e\n\u003ctd\u003e 275 Amp \/ 400 Amp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eMax Voltage (Nominal)\u003c\/th\u003e\n\u003ctd\u003e48V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eLugs \/ Screws\u003c\/th\u003e\n\u003ctd\u003e4 × M8 studs (5\/16\") \u003cbr\u003e6 × M4 (#8) screws\u003cbr\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eCopper Bus Thickness\u003c\/th\u003e\n\u003ctd\u003e275A Version: 3.5 mm\u003cbr\u003e400A Version: 8 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eBusbar Material\u003c\/th\u003e\n\u003ctd\u003eTinned copper\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eHardware\u003c\/th\u003e\n\u003ctd\u003eStainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eBase and Cover Material\u003c\/th\u003e\n\u003ctd\u003eDurable nylon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eDimensions (L × W × H)\u003c\/th\u003e\n\u003ctd\u003e166 × 34 × 43 mm\u003cbr\u003e6.54 × 1.34 × 1.69 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c!-- What's included --\u003e\n\u003ch3 class=\"sapphire-section-title\"\u003eWhat’s Included\u003c\/h3\u003e\n\u003chr class=\"sapphire-hr\"\u003e\n\u003cul class=\"sapphire-suggested\"\u003e\n\u003cli\u003e1 × Red positive bus bar with insulating cover\u003c\/li\u003e\n\u003cli\u003e1 × Black negative bus bar with insulating cover\u003c\/li\u003e\n\u003cli\u003eMounting screws and hardware\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- Installation notes --\u003e\n\u003ch3 class=\"sapphire-section-title\"\u003eInstallation Notes\u003c\/h3\u003e\n\u003chr class=\"sapphire-hr\"\u003e\n\u003cul class=\"sapphire-checklist\"\u003e\n\u003cli\u003eSelect the bus bar rating, cable size, terminals, and circuit protection according to the maximum current expected in your system.\u003c\/li\u003e\n\u003cli\u003eUse properly crimped cable lugs and tighten all connections according to the applicable hardware and cable-terminal specifications.\u003c\/li\u003e\n\u003cli\u003eCable lugs with either 5\/16\" or 3\/8\" mounting holes may be used on the M8 studs when securely clamped with the supplied hardware.\u003c\/li\u003e\n\u003cli\u003eThe accessory screws are intended for compatible small ring terminals. Confirm that each terminal seats flat and remains clear of adjacent hardware.\u003c\/li\u003e\n\u003cli\u003eTerminal fitment can vary between lug manufacturers. The layout has been tested with a range of Sapphire cable lugs to allow the main studs and accessory screws to be used together wherever terminal dimensions permit.\u003c\/li\u003e\n\u003cli\u003eInstall the insulating covers and maintain suitable clearance from nearby conductive components.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- FAQ --\u003e\n\u003ch3 class=\"sapphire-section-title\"\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003chr class=\"sapphire-hr\"\u003e\n\u003cdetails class=\"sapphire-faq-item\"\u003e\n\u003csummary\u003eWhat is the difference between the 275A and 400A versions?\u003c\/summary\u003e\n\u003cdiv class=\"sapphire-faq-body\"\u003e\n\u003cp class=\"sapphire-p\"\u003eBoth versions have the same overall layout, with four M8 main studs, six accessory screws, a durable nylon base, insulating covers, and tinned copper construction. The principal differences are the continuous-current rating and the thickness of the copper busbar.\u003c\/p\u003e\n\u003cp class=\"sapphire-p\"\u003eThe \u003cstrong\u003e275A version\u003c\/strong\u003e uses a 3.5 mm thick tinned copper busbar and is suitable for many RV, marine, automotive, and off-grid installations. The \u003cstrong\u003e400A version\u003c\/strong\u003e uses a substantially thicker 8 mm busbar for systems with larger inverters, higher charging currents, or heavier continuous loads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"sapphire-faq-item\"\u003e\n\u003csummary\u003eWhich current rating should I choose?\u003c\/summary\u003e\n\u003cdiv class=\"sapphire-faq-body\"\u003e\n\u003cp class=\"sapphire-p\"\u003eChoose a bus bar with a continuous-current rating above the highest current you expect it to carry during normal operation. Remember that the current passing through the bus bar may include several devices operating at the same time, such as an inverter, charger, DC fuse panel, and solar charge controller.\u003c\/p\u003e\n\u003cp class=\"sapphire-p\"\u003eThe 275A version is suitable for many moderate-power systems, while the 400A version provides additional capacity for larger inverter systems and high-output battery banks. Your cables, terminals, fuses, disconnects, and other components must also be appropriately rated—the bus bar rating does not increase the capacity of the rest of the circuit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"sapphire-faq-item\"\u003e\n\u003csummary\u003eWill these bus bars work with lithium battery systems?\u003c\/summary\u003e\n\u003cdiv class=\"sapphire-faq-body\"\u003e\n\u003cp class=\"sapphire-p\"\u003eYes. These bus bars are an excellent choice for \u003cstrong\u003eLiFePO\u003csub\u003e4\u003c\/sub\u003e (lithium iron phosphate)\u003c\/strong\u003e battery systems and are equally suitable for lead-acid, AGM, and gel batteries. They're designed for use in \u003cstrong\u003e12V, 24V, and 48V nominal DC systems\u003c\/strong\u003e, making them ideal for RVs, marine applications, off-grid solar, service vehicles, and other battery-powered installations.\u003c\/p\u003e\n\u003cp class=\"sapphire-p\"\u003eA common point of confusion is the \u003cstrong\u003e48V rating\u003c\/strong\u003e. In the battery industry, \u003cstrong\u003e\"48V\" refers to the nominal system voltage\u003c\/strong\u003e, not the maximum charging voltage. A typical 48V LiFePO\u003csub\u003e4\u003c\/sub\u003e battery bank charges to approximately \u003cstrong\u003e58.4V\u003c\/strong\u003e, and these bus bars are fully suitable for use in those systems. This is standard practice across the industry, so you can confidently use them with modern lithium battery banks operating at their normal charging voltages.\u003c\/p\u003e\n\u003cp class=\"sapphire-p\"\u003eAs always, ensure the selected \u003cstrong\u003e275A or 400A current rating\u003c\/strong\u003e is appropriate for your installation, and properly size your cables, terminals, fuses, and disconnect devices to match the maximum current your system can safely carry.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"sapphire-faq-item\"\u003e\n\u003csummary\u003eWhy do these bus bars use M8 (5\/16\") studs instead of 3\/8\" studs?\u003c\/summary\u003e\n\u003cdiv class=\"sapphire-faq-body\"\u003e\n\u003cp class=\"sapphire-p\"\u003eM8 studs provide an excellent balance of strength, compatibility, and usable terminal space. Lithium batteries and many common DC components already use M8 terminals, so keeping this connection size consistent reduces the need to purchase custom cables with different lug sizes at each end.\u003c\/p\u003e\n\u003cp class=\"sapphire-p\"\u003eThe studs provide ample clamping force for the rated applications and also accept cable lugs with \u003cstrong\u003e3\/8\" mounting holes\u003c\/strong\u003e. This gives installers the versatility to use either 5\/16\" or 3\/8\" lugs while preserving more usable space around each terminal and reducing interference with neighbouring connections.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"sapphire-faq-item\"\u003e\n\u003csummary\u003eWhat size cable lugs fit the main studs?\u003c\/summary\u003e\n\u003cdiv class=\"sapphire-faq-body\"\u003e\n\u003cp class=\"sapphire-p\"\u003eThe main terminals are M8 studs, commonly described as 5\/16\". Cable lugs with a 5\/16\" mounting hole provide the closest fit, but standard lugs with a 3\/8\" mounting hole can also be securely installed using the supplied washer and nut.\u003c\/p\u003e\n\u003cp class=\"sapphire-p\"\u003eThis compatibility makes it easier to use commonly available battery cables without purchasing adapters or specialty cables. Always make sure the lug sits flat against the conductive surface and is securely clamped before placing the system into service.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"sapphire-faq-item\"\u003e\n\u003csummary\u003eWhat are the six smaller screw terminals used for?\u003c\/summary\u003e\n\u003cdiv class=\"sapphire-faq-body\"\u003e\n\u003cp class=\"sapphire-p\"\u003eThe six M4 (#8) screws provide convenient connection points for smaller circuits that do not require one of the large main studs. Typical uses include monitoring equipment, solar charge controllers, DC fuse panels, low-current chargers, relays, and other accessory circuits.\u003c\/p\u003e\n\u003cp class=\"sapphire-p\"\u003eThe screw terminals and main studs are deliberately spaced so compatible ring terminals can be installed on both at the same time. Lug dimensions vary between manufacturers, but we have tested the layout with a variety of Sapphire terminals to help customers maximize the usable connection capacity of each bar.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"sapphire-faq-item\"\u003e\n\u003csummary\u003eDoes this kit include both the positive and negative bus bars?\u003c\/summary\u003e\n\u003cdiv class=\"sapphire-faq-body\"\u003e\n\u003cp class=\"sapphire-p\"\u003eYes. Each kit includes one red bus bar for positive distribution and one black bus bar for negative distribution. Both bars include insulating covers, along with the required mounting hardware.\u003c\/p\u003e\n\u003cp class=\"sapphire-p\"\u003eThe two bus bars are electrically independent. They can be mounted together as a matched positive-and-negative distribution point or positioned separately to suit the layout of your electrical system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"sapphire-faq-item\"\u003e\n\u003csummary\u003eAre these bus bars suitable for marine installations?\u003c\/summary\u003e\n\u003cdiv class=\"sapphire-faq-body\"\u003e\n\u003cp class=\"sapphire-p\"\u003eYes. The conductive bars are made from \u003cstrong\u003etinned copper\u003c\/strong\u003e, combining excellent electrical conductivity with improved resistance to oxidation and corrosion. This makes them well suited to properly installed marine, RV, automotive, and off-grid electrical systems.\u003c\/p\u003e\n\u003cp class=\"sapphire-p\"\u003eThe insulating covers and durable nylon bases also help create a clean and protected installation. As with other marine electrical equipment, the bus bars should be installed in a suitable location and protected from direct spray, standing water, and physical damage.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"sapphire-faq-item\"\u003e\n\u003csummary\u003eDo I need to use fuses with a bus bar?\u003c\/summary\u003e\n\u003cdiv class=\"sapphire-faq-body\"\u003e\n\u003cp class=\"sapphire-p\"\u003eYes. A bus bar distributes power but does not provide circuit protection. Each wire must be protected according to its safe current-carrying capacity and the requirements of the connected equipment.\u003c\/p\u003e\n\u003cp class=\"sapphire-p\"\u003eA simple rule for beginners is that whenever a circuit steps down to a smaller wire than the cable feeding the bus bar—or to a wire smaller than the upstream fuse can safely protect—the smaller outgoing wire should have its own appropriately sized fuse or circuit breaker. For this reason, it is generally recommended to fuse the wires leaving the bus bar as close to the distribution point as practical.\u003c\/p\u003e\n\u003cp class=\"sapphire-p\"\u003eBrowse our \u003ca rel=\"noopener\" href=\"https:\/\/sapphirebattery.ca\/collections\/fuses-circuit-protection\" target=\"_blank\"\u003e fuses and circuit-protection products \u003c\/a\u003e for options suitable for small accessory circuits through high-current battery and inverter cabling.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"sapphire-faq-item\"\u003e\n\u003csummary\u003eCan I connect multiple bus bars together?\u003c\/summary\u003e\n\u003cdiv class=\"sapphire-faq-body\"\u003e\n\u003cp class=\"sapphire-p\"\u003eYes. Multiple bus bars can be linked to add more connection points or create separate distribution areas for equipment such as inverters, chargers, solar controllers, and DC fuse panels.\u003c\/p\u003e\n\u003cp class=\"sapphire-p\"\u003eUse a \u003cstrong\u003eshort, appropriately sized high-current cable\u003c\/strong\u003e between the bus bars. The interconnect must be capable of carrying the maximum current that may flow between them, and the complete system must be arranged so its cables and circuit protection remain within their safe ratings. Keeping the link short helps reduce resistance and voltage drop.\u003c\/p\u003e\n\u003cp class=\"sapphire-p\"\u003eWe carry an assortment of high-current cables intended for battery-system and bus-bar interconnections.  Feel free to \u003ca rel=\"noopener\" href=\"https:\/\/sapphirebattery.ca\/pages\/contact\" target=\"_blank\"\u003econtact us\u003c\/a\u003e and we can help recommend or supply a suitable cable for your installation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e","brand":"Sapphire Energy","offers":[{"title":"275 Amp","offer_id":54098514772287,"sku":null,"price":34.95,"currency_code":"CAD","in_stock":true},{"title":"400 Amp","offer_id":54098514805055,"sku":null,"price":69.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0914\/6803\/8463\/files\/BB275-Busbar_set_1800px_1.webp?v=1759275771","url":"https:\/\/sapphirebattery.ca\/products\/275a-400a-dual-power-distribution-bus-bar-kit","provider":"Sapphire Energy","version":"1.0","type":"link"}