Blue Sea Systems m-Series Battery Switch Link Bus, 250A, 2pk

Overview

The Blue Sea Systems 9159 is an m-Series battery switch link bus used to parallel compatible m-Series battery switches in a high-current DC system. It is built from tin-plated copper, carries a 250A continuous DC rating, and comes as a 2-pack for multi-switch battery bank layouts.

This part is used when two m-Series battery switches need a direct switch-to-switch connection without making up short jumper cables. On a boat, that usually means a cleaner battery switching layout, fewer extra cable terminations around the switch cluster, and a setup that is easier to trace later during service or troubleshooting.

Key features

• Made to parallel compatible Blue Sea Systems m-Series battery switches
• Tin-plated copper construction for strong conductivity and better corrosion resistance in marine electrical spaces
• 250A continuous DC rating for battery switching circuits that carry substantial current
• Sold as a 2-pack for dual-switch installations or keeping a second link bus for matching switch layouts

Compatibility and fit

This link bus is for Blue Sea Systems m-Series battery switch installations, so the main fit check is the switch family rather than the boat model. It suits boats with separate battery banks where the switching arrangement calls for the switches to be paralleled at the panel or battery management area.

It is a sensible match for compact DC systems on center consoles, cruising boats, fishing boats, and sailboats where switch access is tight and clean cable routing matters. It is not a battery switch by itself and it does not replace overcurrent protection or a main distribution bus elsewhere in the system.

Installation and setup

This part belongs at the battery switch cluster and should be installed where the switches are mounted securely and protected from unnecessary movement. In a refit or new build, it helps simplify the switch-to-switch connection so the layout around the battery switches stays easier to inspect and maintain.

Because it sits in the high-current side of the DC system, the rest of the installation still needs to be built around the current demands of the boat and the rating of the connected switches and cabling. The link bus helps with the physical interconnection, but the overall system design still depends on the rest of the battery switching hardware being matched correctly.

What’s included

• Two m-Series battery switch link buses

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.

Learn more.

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.

Learn more.

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.

Learn more.