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Blue Sea 300A Red Mini m-Series On/Off Battery Switch w/ Key
Blue Sea 300A Red Mini m-Series On/Off Battery Switch w/ Key
Ignition Protected, Removable Key, 48V DC Rated, Compact Mount
Key features: Ignition protected for safe marine use, Removable key for added security, Breakout side panels for cable access, 300A continuous rating.
Highlights:Removable Key: Ergonomic key actuator that can be removed for security,Mounting Points: Standard mounting holes for secure installation,Safety Compliance: Ignition protected and marine UL listed for safety,OFF Position: Clear circuit isolation indicator.
High-conductivity 3/8 inch (approx 10mm) tinned copper studs labelled for input and output, designed to handle 300A continuous loads.
Technical schematic illustrating physical dimensions and mounting depth requirements. 
Regular price
$57.00
Availability:
In Stock
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DESCRIPTION
Compact battery isolation for marine, RV and DC power systems
When space is tight but current demands are high, the Blue Sea mini m‑Series ON/OFF battery switch is designed to deliver reliable battery isolation in a compact footprint. It’s a practical choice for boat owners and installers who want a neat, serviceable way to disconnect a battery for maintenance, storage, fault-finding or improved safety—without resorting to oversized switchgear.
Rated to handle demanding DC loads, this single-circuit battery isolator suits a wide range of 12V, 24V and up to 48V DC systems. Use it to control a single battery feeding a single load group such as a house panel, inverter circuit, bow thruster feed, winch circuit (where appropriately engineered), or auxiliary power distribution. For many setups, adding a dedicated isolation point can help reduce the risk of parasitic drain, accidental short circuits during servicing, and confusion when troubleshooting onboard electrics.
Keyed ON/OFF operation for controlled access
This model includes a removable key, giving you a simple way to limit operation when the vessel is unattended or when you want only authorised users to energise critical circuits. It’s also handy in shared-use applications (workboats, club boats, fleet vehicles, camper fit-outs) where consistent procedures matter.
Built for marine environments and compliant installation
Blue Sea Systems components are widely specified in marine electrical builds for their focus on durability and installer-friendly design. This switch is ignition protected, making it suitable for installation aboard petrol-powered boats where electrical equipment must be designed to reduce the likelihood of ignition in fuel vapour environments (install to relevant standards and manufacturer guidance).
The casing is engineered for flexibility, supporting surface mounting as well as front or rear panel mounting. Breakout side panels assist with cable access and routing, helping you achieve a cleaner install—particularly valuable in compact battery compartments and console cavities.
Designed to handle high current in a small package
Despite its mini format, this switch is designed for substantial current handling, with a 300A continuous rating (and higher short-duration ratings for intermittent and starting loads). As with any high-current DC switching, final performance depends on correct cable sizing, termination quality, ventilation/ambient temperature, and overall installation practices.
Key features
- Single-circuit ON/OFF battery isolator for one battery to one load group
- Removable key for controlled access and added security
- Ignition protected for use in petrol-powered marine applications
- Compact mini m‑Series body suited to tight installs
- Versatile mounting: surface, front panel or rear panel
- Rear contact protection via isolating cover with snap-on sections
Ideal applications
- Boat battery master isolation (house or auxiliary bank)
- Caravan and RV DC isolation point for service and storage
- Off-grid DC systems requiring a simple ON/OFF disconnect
- Work vehicles and marine service rigs with controlled power access
Fit it once, service with confidence
If you’re upgrading your battery management or adding a proper isolation point to a new build, the Blue Sea mini m‑Series switch offers a professional, space-efficient solution with keyed operation and marine-ready design. Choose this switch to simplify maintenance, improve safety procedures, and keep your DC system organised—then install it as part of a well-designed wiring and protection plan.
SKU: BS-6005B
SPECIFICATIONS
Specifications
| Switch Type | Single Circuit ON-OFF |
|---|---|
| Color | Red |
| Maximum Voltage | 48V DC |
| Stud Size |
3/8" (approx. 9.53 mm; reference only) |
| Continuous Rating | 300A |
| Intermittent Rating | 500A |
| Starting Rating (30 sec) | 900A |
| Stud Material | Tinned Copper |
| Stud Torque |
120 in-lb (13.56 N·m) (approx. 10.0 ft-lb; reference only) |
| Switching Rating | 25A |
| Weight (min / max) |
0.65–0.65 lb (0.29–0.29 kg) (approx. 290 g; reference only) |
| SKU: | BS-6005B |
| Model #: | BS-6005B |
| MPN: | BS-6005B |
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.
