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Blue Sea 300A Black Mini m-Series 3 Position (OFF/1/2) Battery Selector Switch
Blue Sea 300A Black Mini m-Series 3 Position (OFF/1/2) Battery Selector Switch
Compact 300A switch with tinned copper studs & isolating cover
Key features: Ignition protected for safe marine installation, 300A continuous rating handles high loads, 3-position selector (OFF/1/2) for battery management, Compact surface mount design.
The compact Mini m-Series faceplate features clear, luminous labelling for the OFF, 1, and 2 positions, allowing easy switching between battery banks or isolating power entirely.
Highlights:Output Terminal: Common output stud for connecting to the engine or distribution panel,Battery 1 Input: Connection stud for the first battery bank,Battery 2 Input: Connection stud for the second battery bank,Isolation Ribs: Plastic housing ribs to prevent accidental shorting between cables. 
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$89.00
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DESCRIPTION
High-Current Battery Selector Switch for Marine & 4WD Dual-Battery Systems
The Blue Sea m-Series Mini 3 Position Battery Selector Switch is designed for dependable, high-current battery management where clear isolation and simple selection matter. In boats, caravans, camper trailers and 4WD touring vehicles, battery systems are often asked to support critical loads such as fridges, lighting, comms, bilge pumps, winches and inverters. This switch provides a straightforward way to choose which battery supplies your DC system, or to shut the system down completely when you’re storing the vessel or working on the electrical system.
With OFF / 1 / 2 positions, it helps you manage two battery banks with confidence: run house loads from one battery, preserve a second battery for starting, or change over to a healthier battery if one is low. The compact “mini” footprint is particularly useful when space is limited behind a helm, in a console, in a battery compartment, or in a 4WD canopy electrical panel.
Designed to Reduce Electrical Loss and Resist Corrosion
Voltage drop and corrosion are common causes of poor performance in marine and mobile power systems—especially in Australian coastal environments. This switch is built around tin-plated copper studs that support strong conductivity while improving resistance to corrosion. That means more of your available battery power reaches your loads, and connections stay serviceable for longer in harsh conditions.
The one-piece terminal stud design is engineered to minimise the chance of loosening over time. In applications subject to vibration—such as off-road touring, trailer mounting, or pounding seas—secure terminations help maintain consistent power delivery and reduce intermittent faults that can be difficult to diagnose.
Safer Isolation and Cleaner Installs
Isolation is more than convenience; it’s a practical safety measure. Switching to OFF allows you to disconnect the battery from your load circuits when the system is unattended, when you’re performing maintenance, or when you want to reduce the chance of accidental drain. It can also assist with troubleshooting by letting you isolate a battery or circuit group quickly.
The rear of the switch is protected by an isolating cover that helps shield live contacts from accidental shorts. Its snap-off side sections are designed to improve cable routing flexibility, making it easier to run heavy battery cabling neatly in the direction that best suits your installation—helpful when you’re working in tight marine lockers, battery boxes, or compact 12V distribution areas.
Where This 3 Position Battery Switch Fits Best
This style of battery selector switch is commonly used as part of a marine battery switch setup or a dual battery system where you want direct, manual control over battery selection. It suits many typical Australian applications, including:
- Boat starting and house battery separation (OFF/1/2 selection)
- Caravan and camper trailer auxiliary power changeover
- 4WD touring canopies and drawer systems with two battery banks
- Small commercial marine, tinnies, runabouts and centre consoles needing compact switching
- Work vehicles requiring a simple battery isolation method for storage or servicing
Key Features
- 3 position selector for straightforward OFF/1/2 battery control
- 300A continuous rating to support high-demand DC systems
- Tin-plated copper studs for high conductivity and improved corrosion resistance
- One-piece terminal stud design to help maintain reliable connections over time
- Isolating rear cover with configurable cable access to support safer, cleaner wiring
Why Choose Blue Sea Systems for Battery Switching?
Battery switches are often installed and forgotten—until the day they’re needed to isolate a fault, preserve starting power, or shut down a system quickly. Blue Sea Systems is widely specified in marine electrical builds because its components are designed for demanding DC environments, where vibration, humidity and salt exposure are normal. Choosing a switch built for these conditions can reduce ongoing maintenance and help keep your power system predictable, especially across long trips and seasonal storage.
Installation Notes (Practical Considerations)
For best results, battery switching should be planned as part of the overall DC layout: cable sizing, termination quality, and secure mounting all affect performance. Ensure your load requirements match the switch’s current capability, use correctly crimped ring terminals, and route cables to minimise strain on studs. If you’re integrating the switch into a marine system, consider professional advice to align with common marine wiring practices and applicable safety expectations.
Reliable Manual Control for Two-Battery Power Systems
If you’re looking for a compact, high-current battery selector switch that supports clean wiring and dependable operation, the Blue Sea 300A Black Mini m-Series OFF/1/2 switch is a proven option for marine, caravan and 4WD electrical systems. It delivers practical battery isolation and selection in a format that suits space-conscious installs—ideal for Australian conditions where corrosion resistance and vibration durability are important.
SKU: BS-6008200
SPECIFICATIONS
Specifications
| Switch Type | Selector 3 Position |
|---|---|
| Color | Black |
| Switch Positions | 3 |
| Battery Combine | No |
| Alternator Field Disconnect | No |
| Maximum Voltage | 32V DC |
| Stud Size |
3/8" (approx. 9.53 mm; reference only) |
| Terminal Stud Torque |
120 in-lb (13.56 N·m) (approx. 10.0 ft-lb; reference only) |
| Continuous Rating | 300A |
| Intermittent Rating | 500A (5 min) |
| Starting Rating (30 sec) | 900A |
| Battery Inputs | 2 |
| Cable Clearance For 4/0 AWG Cables |
1.12in (28.45 mm) (reference only) |
| Mounting Holes |
Accept #10 Screw (approx. #10 major diameter 4.83 mm; reference only) |
| Stud Material | Tinned Copper |
| Stud Torque |
120 in-lb (13.56 N·m) (approx. 10.0 ft-lb; reference only) |
| Switching Rating | 25A |
| Terminal Stud Size |
3/8" - 16 (M10) (3/8" ≈ 9.53 mm major diameter; M10 is 10 mm; 16 TPI ≈ 1.59 mm pitch; reference only) |
| Weight (min / max) |
0.77–0.77 lb (0.35–0.35 kg) (approx. 350 g; reference only) |
| SKU: | BS-6008200 |
| Model #: | BS-6008200 |
| MPN: | BS-6008200 |
WARRANTY
Blue Sea Warranty Policy
Blue Sea Systems products sold by us are supplied with a warranty against defects for the warranty period shown below, subject to the product type, application and the terms of this warranty policy.
The express warranty provided by us is limited to a maximum of 5 years from the original date of purchase, unless otherwise required under Australian Consumer Law.
Blue Sea Systems may offer longer manufacturer support on some products at their discretion
Warranty Lengths by Product Range
| Blue Sea Product Range | Warranty Length | Application / Notes |
|---|---|---|
| Most Blue Sea Systems Products | 5 years | Applies to most Blue Sea Systems products found to be defective in materials or manufacture. |
| P12 Battery Chargers | 5 years | Warranty period starts from the original date of purchase. |
| P12 Remote Displays | 5 years | Warranty period starts from the original date of purchase. |
| Digital Meters | 3 years | Warranty period starts from the original date of purchase. |
| Vessel System Monitors | 3 years | Warranty period starts from the original date of purchase. |
Warranty Assessment and Remedy
If a Blue Sea Systems product is found to be defective in materials or manufacture within the applicable warranty period, we will, at our discretion, arrange a repair, replacement, store credit or refund, depending on the nature of the fault and the requirements of Australian Consumer Law.
Products may need to be returned for assessment before a warranty claim can be approved. Where required, the product must be returned with dated proof of purchase and a clear description of the fault.
Labour costs for removing, replacing, reinstalling or diagnosing a product are not covered by this express warranty unless otherwise required under Australian Consumer Law.
Making a Warranty Claim
To make a warranty claim, please contact us with your dated proof of purchase, product details and a description of the fault.
The product may need to be returned for inspection before the claim can be assessed. If the product is confirmed to be faulty and covered by this warranty, we will advise the available remedy.
What This Warranty Does Not Cover
This warranty does not cover faults or damage caused by incorrect installation, incorrect application, misuse, abuse, neglect, unauthorised modification, accidental damage, normal wear and tear, environmental damage, or failure to use the product in accordance with the manufacturer's instructions.
- Incorrect installation or wiring
- Incorrect product selection or application
- Misuse, abuse or neglect
- Physical or accidental damage
- Water ingress or environmental damage outside the product's intended use
- Unauthorised modification or repair
- Normal wear and tear
- Labour costs for removal, replacement, reinstallation or diagnosis
- Freight, travel or call-out costs unless otherwise required by law
- Products not returned for assessment when reasonably required
Manufacturer Support
Blue Sea Systems may provide additional manufacturer support on some products beyond the warranty period listed above. Where available, we may assist customers in contacting the manufacturer, but any manufacturer support beyond the express warranty period is subject to the manufacturer's own terms and continued availability.
Australian Consumer Law
This warranty is in addition to other rights and remedies available at law. Our goods come with guarantees that cannot be excluded under the Australian Consumer Law. You are entitled to a replacement or refund for a major failure and compensation for any other reasonably foreseeable loss or damage. You are also entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a major failure.
