Blue Sea Systems m-Series Mini Battery Switch with Key, Single Circuit ON-OFF, 48V DC, 300A Continuous

Overview

The Blue Sea Systems m-Series Mini Battery Switch is a single-circuit ON-OFF battery switch with a removable key for isolating one battery from one load group on a boat. It is rated for up to 48V DC, with a 300A continuous rating, 500A intermittent rating for 5 minutes, and 900A starting rating for 30 seconds.

This switch is a practical fit for small craft, center consoles, runabouts, sailboats, and other marine electrical systems where a clear battery disconnect point is needed near the battery, helm, or distribution area. The keyed control helps prevent accidental operation and can be removed when the boat is secured.

Key features

• Single Circuit ON-OFF switching connects or isolates one battery from one load group.
• Rated for 48V DC systems, with 300A continuous current capacity for common marine battery loads.
• Intermittent rating of 500A for 5 minutes and starting rating of 900A for 30 seconds for engine starting loads.
• Ignition protected for installation aboard gasoline powered boats.
• Case supports surface mounting, front-panel mounting, or rear-panel mounting for flexible placement.
• Isolating rear cover with snap-on sections helps protect the rear contacts after installation.
• 3/8"-16 M10 tinned copper terminal studs support high-current battery cable connections.
• Mounting holes accept #10 screws, giving installers a common fastening size for panels and bulkheads.

Variants

This m-Series Mini Battery Switch is offered in two color configurations. Both variants use the same single-circuit ON-OFF key switch format, while the visible key and switch color change to match the installation style.

The electrical ratings, switch positions, mounting approach, and terminal stud format remain consistent across these two versions.

• 6005: Red. This version gives the battery disconnect a traditional red marine battery-switch look that stands out clearly near batteries, helm panels, or service areas.
• 6005200: Black. This version has a lower-contrast appearance for panels or compartments where a black control face better matches surrounding hardware.

Installation and fit

The compact m-Series case can be mounted on the surface of a panel, through the front of a panel, or from the rear, which helps when replacing an existing switch or laying out a new battery control area. Allow enough clearance behind the switch for battery cables and ring terminals, especially when using large conductors.

The terminal studs are sized for 3/8" and M10 ring terminals, with cable clearance for 4/0 AWG cable. Terminal stud torque is 120 in-lb, so final tightening should be done with the correct tool rather than by feel alone.

Use on board

This switch suits boats that need a straightforward manual battery shutoff for a single battery feed, such as small engine-start circuits, electronics load groups, or house distribution feeds that need to be isolated when the boat is stored. It is also useful where a removable key is preferred for extra control over who can energize the circuit.

Because the switch is ignition protected, it can be used in gasoline boat installations where electrical equipment may be located near fuel vapors, provided the overall installation follows marine electrical practices and the connected cable size matches the system load.

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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