Blue Sea Systems MaxiBus 250A BusBar, 300V AC, 48V DC, Tin-Plated Copper

Overview

The Blue Sea Systems MaxiBus 250A BusBar is a heavy-duty electrical distribution busbar for consolidating multiple conductors or feeding multiple circuits in marine AC and DC systems. It is rated for 250A continuous current, with a maximum voltage of 300V AC or 48V DC, making it a practical fit for battery banks, main distribution points, inverter feeds, charging systems, and negative return consolidation on boats.

The raised tin-plated copper bus gives installers room to land multiple wires cleanly, while the UL 94-V0 rated glass-reinforced thermoplastic base helps handle heat in demanding electrical compartments. Recessed mounting holes help reduce the chance of accidental shorts when the busbar is mounted near aluminum or steel surfaces.

Key features

• 250A continuous rating for high-current distribution and return circuits on board.
• Maximum voltage rating of 300V AC and 48V DC for marine electrical systems within those limits.
• Tin-plated copper CDA 110 / UNS 11000 bus material for low-resistance current transfer.
• UL 94-V0 rated glass-reinforced thermoplastic base for heat resistance in electrical compartments.
• Insert-molded stainless steel studs allow high stud torque without a separate securing nut.
• Raised bus layout gives better access when terminating multiple conductors on one stud or screw point.
• Recessed mounting holes help prevent accidental shorts to metal mounting surfaces.

Variants

This MaxiBus 250A BusBar is offered in several terminal layouts so the same current rating can be matched to different wiring layouts and conductor counts.

The variants differ by the number and type of termination points: 5/16"-18 studs for larger ring terminals, #10-24 screws for smaller branch or accessory conductors, or a combination of both. The 250A continuous rating, 300V AC / 48V DC maximum voltage rating, tin-plated copper bus, and UL 94-V0 rated base remain consistent across the range.

• 2127: Four 5/16"-18 studs. This layout suits installations where the main need is landing larger conductors on stud terminals with a clean common bus point.
• 2128: Two 5/16"-18 studs plus six #10-24 screws. This layout combines larger stud connections with smaller screw terminals for mixed main and branch wiring.
• 2105: Two 5/16"-18 studs plus twelve #10-24 screws. This layout gives more screw terminal positions for systems with a higher number of smaller conductors tied into the same bus.
• 2126: Six 5/16"-18 studs. This layout focuses on larger stud terminations when multiple heavy conductors need a shared distribution or return point.

Installation and fit

Install the busbar in a dry, protected electrical area where terminals can be inspected and tightened without strain on the wiring. The open layout is useful in battery compartments, distribution panels, machinery spaces, and equipment lockers where organized cable routing matters as much as current capacity.

Use ring terminals that match the selected terminal layout and tighten connections to the proper torque for the terminal type. The recommended stud torque is 132 in-lb, and the recommended screw torque for #10-24 screw terminals is 23 in-lb where those screw terminals are present.

Electrical use on board

This busbar works well as a common positive distribution point, negative return bus, or shared connection point for charging and load circuits, provided the installation stays within the 250A continuous rating and the voltage limits. It is especially useful when a boat has outgrown simple point-to-point wiring and needs a cleaner way to group conductors.

As with any marine high-current connection, cable size, overcurrent protection, terminal quality, and mounting location should be matched to the actual load and the vessel wiring plan.

Orders are processed within 2 business days, which includes verification, packing, and dispatch. Orders of $100 or more qualify for free shipping when eligible. For orders under $100, shipping costs are calculated at checkout based on destination, package weight, and selected service. International shipping is available for eligible products, and certain items may require additional handling, warehouse transfers, or may ship directly from the manufacturer, which can affect processing time.

Deliveries are handled by preferred carriers such as USPS, UPS, FedEx, DHL, and others depending on your location and selected service. Estimated delivery times are displayed at checkout and may vary due to customs processing, carrier delays, weather, postal disruptions, or other circumstances beyond our control. Once your order ships, you'll receive a confirmation email with tracking information. Tracking may take up to 24 hours to update on the carrier's website and is also available through your account when applicable.

We ship throughout the United States and to most international destinations for products eligible for international shipping. International orders may be subject to customs duties, taxes, brokerage charges, or other import fees, which are the customer's responsibility and are not included in the product or shipping price. PO Boxes are accepted only when shipping through USPS, and not all packages qualify for this option. If your order does not arrive within the estimated delivery window, please contact us at info@apollolighting.com or +1 (954) 375-0100 so we can assist with locating your package.

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Returns may be requested within 30 days of receiving your order. Items must be unused, uninstalled, unaltered, and returned in their original packaging with all tags, packing materials, blank warranty cards, manuals, instructions, accessories, and included items. Certain products, including installed or used electronics, electrical components, lighting, consumables, custom or special-order items, cut-to-length products, safety equipment, and merchandise exposed to water or marine conditions, may not be eligible for return.

To request a return, sign in to your account and select the applicable order and items, and submit your request for review. Eligible unfulfilled items may also be submitted for cancellation within 1 hour of placing the order. Returns or cancellations are not considered approved until you receive confirmation from Apollo Lighting. Please do not ship or drop off merchandise before receiving return approval and instructions.

Customers are responsible for arranging and paying for return shipping unless the return is due to an error by Apollo Lighting or the item is verified as defective, damaged, or incorrect. Missing, damaged, defective, or incorrect items must be reported within 2 business days of delivery, and photos or other documentation may be required for review. If the issue is verified, Apollo Lighting may provide or reimburse return shipping and issue a replacement or refund depending on the circumstances. International customers are responsible for return shipping, duties, taxes, customs charges, brokerage fees, and other costs associated with an international return.

After your return is received and inspected, approved refunds are issued to the original payment method and may take 5-7 business days to appear after processing. Original shipping and handling charges are nonrefundable, and the value of any included free items that are not returned may be deducted from the refund. Apollo Lighting does not charge a standard restocking fee on eligible returns. Returns that are incomplete, damaged, installed, used, altered, improperly packaged, or otherwise do not meet the eligibility requirements may be refused. We recommend using a trackable and appropriately insured shipping service for all customer-arranged returns.

For assistance, contact info@apollolighting.com or call +1 (954) 375-0100.

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Many products sold by Apollo Lighting include a manufacturer's warranty covering defects in materials or workmanship. Warranty terms vary by brand, product category, and model, so eligibility, coverage duration, exclusions, and available remedies are determined by the applicable manufacturer. We recommend reviewing the warranty information provided with your product before installation or use, especially for marine electronics, navigation equipment, lighting, electrical systems, pumps, safety equipment, and other specialized marine products.

If you need warranty service, the claim must follow the process established by the manufacturer, authorized service center, or designated warranty provider. You may be asked for proof of purchase, a serial number, product registration, photos, maintenance or installation records, or other documentation. Apollo Lighting does not determine or modify a manufacturer's warranty coverage or final claim decision, but we are happy to help provide purchase information and direct you to the appropriate manufacturer or warranty resource.

Keep your receipt, product documentation, serial number information, and original packaging when practical. Damage caused by normal wear, misuse, improper installation, insufficient maintenance, corrosion, impact, unauthorized modifications, electrical issues, or operation outside the manufacturer's specifications may not be covered. Warranty claims are separate from standard returns, so a product that has been installed, used, or exposed to marine conditions may no longer qualify for return while still remaining eligible for evaluation under the manufacturer's applicable warranty.

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