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Blue Sea 300A Black Mini m-Series On/Off Battery Switch
Blue Sea 300A Black Mini m-Series On/Off Battery Switch
300A Continuous - Ignition Protected - 3/8" (Approx. M10) Studs
Key features: Ignition protected for marine engine rooms, Single Circuit ON-OFF operation, 300A continuous rating, Supports up to 48V DC systems.
Highlights:Input Terminal: 3/8 inch (M10) tinned copper stud,Output Terminal: 3/8 inch (M10) tinned copper stud,Isolation Partition: Protects against accidental shorting,Mounting Hole: Accepts #10 (M5) screw.
Versatile mounting configurations allow for surface, rear, or front panel installation to suit different marine dashboard and enclosure depths
Key features: 300A continuous current rating, Max voltage 48V DC, Accepts up to 120mm² (4/0 AWG) cables, Compact footprint for tight installations. 
Regular price
$57.00
Availability:
In Stock
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DESCRIPTION
Compact High-Amperage Battery Isolation for Marine and Vehicle Systems
The Blue Sea Systems m-Series Battery Switch provides a robust switching solution in a compact footprint, specifically engineered for space-constrained installations in boats, caravans, and 4WDs. While small in size, this switch delivers a substantial 300A continuous rating, making it capable of handling the heavy electrical loads found in modern onboard systems.
Designed for versatility, it serves as a reliable main disconnect for 12V, 24V, and 48V DC systems. Its compact form factor allows it to be installed close to battery banks or on crowded distribution panels where traditional heavy-duty switches simply will not fit. By isolating the battery, you prevent parasitic drain during storage and ensure a safe, mechanical disconnection during maintenance.
Ignition Protected and Marine Ready
Safety is paramount in marine environments, particularly aboard vessels with gasoline engines. This switch features ignition protection, making it safe for installation in engine rooms or fuel lockers where fumes may be present. The design prevents internal sparking from igniting surrounding gases, compliant with stringent marine safety standards.
Constructed with tinned copper studs, the unit offers maximum conductivity and corrosion resistance—critical for withstanding the harsh saline atmosphere of Australian coastal waters. The 3/8"-16 (Approx. M10) stud terminals are sized to accept heavy-duty ring terminals, accommodating cables up to 4/0 AWG (Approx. 120mm²) to meet current ratings without overheating.
Flexible Mounting and Installation
One of the standout features of the m-Series is its versatile case design, which supports three mounting options: surface, rear panel, or front panel mounting. This flexibility simplifies integration into custom control panels or existing battery boxes without requiring extensive modifications.
The included isolating cover with snap-on sections protects the rear contacts, preventing accidental short circuits from loose tools or debris. This attention to detail ensures your electrical system remains safe and compliant with installation regulations.
Key Features
- Continuous Rating: 300A — Handles high-demand loads efficiently
- Maximum Voltage: 48V DC — Suitable for 12V, 24V, and 48V banks
- Cranking Rating: 900A (30 sec) — Reliable engine starting power
- Compact Design: "Mini" footprint fits where larger switches cannot
- Stud Size: 3/8"-16 (Approx. M10) tinned copper for corrosion resistance
- Ignition Protected: Safe for use in petrol engine compartments
- Switch Type: Single Circuit ON-OFF configuration
Reliable Power Management
Upgrading to a high-quality battery switch reduces the risk of electrical failure and provides peace of mind when storing your vehicle or vessel. Unlike generic switches that may suffer from voltage drop or contact heating under load, the Blue Sea Systems m-Series maintains a low-resistance connection for optimal system performance.
Whether you are fitting out a new LiFePO4 battery system, upgrading a camper trailer, or replacing an old corroded switch on a boat, this unit offers professional-grade reliability in a package that fits almost anywhere.
Secure your electrical system with the Blue Sea m-Series switch today for reliable isolation and safety.
SPECIFICATIONS
Specifications
| Switch Type | Single Circuit ON-OFF |
|---|---|
| Color | Black |
| Switch Positions | 2 |
| Battery Combine | No |
| Alternator Field Disconnect | No |
| Maximum Voltage | 48V 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 | 1 |
| Cable Clearance For 4/0 AWG Cables |
1.12in (28.45 mm) (reference only) |
| Cable Size to Meet Ratings |
4/0 AWG (120mm²) (AWG vs mm² is an approximate equivalence; 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) |
0.65–0.65 lb (0.29–0.29 kg) (approx. 290 g; reference only) |
| SKU: | BS-6006200B |
| Barcode: | 632085600624 |
| Model #: | BS-6006200B |
| MPN: | BS-6006200B |
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.
