Blue Sea Systems m-Series Mini Battery Switch with Key, Single Circuit ON-OFF, 48V DC, 300A Continuous
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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.
Shipping
We ship worldwide from the United States. Rates are calculated at checkout based on destination and package weight. Some items include free shipping, which will show automatically. Not every product is eligible for international shipping; checkout will confirm eligibility. We do not ship to PO Boxes except through USPS, and not all packages qualify.
Processing and dispatch
Most orders are verified, packed, and handed to the carrier within 1 to 2 business days. Some products may need extra handling time or ship directly from the manufacturer. For certain international orders, inventory transfers between warehouses may add time. If any delay is expected, we will let you know the dispatch date.
Delivery and tracking
Deliveries are handled by trusted carriers such as USPS, UPS, FedEx, and DHL. Estimated arrival times appear at checkout and depend on your location and the service you choose. These are estimates and can be affected by customs or carrier disruptions. A shipping confirmation with a tracking link is emailed when your order ships, and tracking may take up to 24 hours to update. You can also view tracking in your account.
Duties, taxes, and support
International customers are responsible for any customs duties, taxes, and fees charged by the destination country. If these charges are refused and a shipment returns to us, the carrier’s return cost and any re-entry customs fees will be deducted from the refund. If your order is late or you need help, contact cs@qualityboatparts.com and we will assist you.
Quality Boat Parts is a reseller. Many items include a manufacturer’s warranty, and all warranty service is handled directly by the manufacturer. We do not manage or administer warranty claims on behalf of customers.
Warranty terms, coverage, and duration are set by each manufacturer. Issues involving defects, repairs, or replacements must be addressed with the manufacturer’s support team. When available, the warranty period is listed on the product page. If it is not shown, contact us or the manufacturer for details before purchasing.
To start a claim, the customer must contact the manufacturer and follow their process. Keep your proof of purchase and original packaging, and register the product if the manufacturer requires it, as these are often needed for warranty service.
We are happy to help you find the right contact or documentation, but we cannot decide outcomes or intervene in claim resolutions. For guidance, email cs@qualityboatparts.com.