Blue Sea M-Series Battery Switch Spare Key, Red
Blue Sea M-Series Battery Switch Spare Key, Red
Genuine OEM Isolator Actuator with Moulded Keyring Hole

DESCRIPTION
Reliable Replacement Key for Blue Sea Systems M-Series Isolators
Maintaining uninterrupted access to your electrical distribution system is vital for safe vessel and vehicle operation. The Blue Sea M-Series Battery Switch Spare Key serves as a direct, genuine replacement or backup actuator for compatible M-Series battery isolators. In demanding marine, RV, and off-grid environments, removable isolator keys can easily be misplaced, dropped overboard, or inadvertently left behind. Keeping a dedicated spare key onboard ensures you are never locked out of your primary 12V, 24V, or 48V DC power banks when you need to start an engine or energise critical house loads.
Engineered for Precision and Durability
Unlike standard aftermarket alternatives that may suffer from poor tolerances, brittle plastics, or premature wear, this genuine Blue Sea Systems component is manufactured to exact OEM specifications. Using an ill-fitting replacement key risks damaging the internal locking cylinder of your battery switch, which can lead to intermittent electrical contact or a complete failure to engage the isolator. This genuine M-Series key engages smoothly and securely with the switch mechanism, ensuring reliable mechanical actuation every time you isolate or connect your battery bank.
- Genuine OEM Compatibility: Specifically engineered to fit Blue Sea Systems M-Series (Mini) battery switches with removable key functionality.
- High-Visibility Finish: Moulded in bright red to allow quick visual identification in dimly lit lockers, engine bays, or crowded toolboxes.
- Integrated Keyring Hole: Features a sturdy moulded attachment point for secure tethering to lanyards, floating keychains, or main ignition sets.
- Marine-Grade Construction: Built from durable, non-corrosive materials suited to harsh saltwater environments, high humidity, and extreme temperature fluctuations.
Risk Reduction in Critical Power Systems
Removable key switches are widely utilised across marine vessels, 4WD dual-battery setups, caravans, and industrial equipment to prevent unauthorised operation and eliminate parasitic battery drain during storage. However, the security of a removable key system introduces a single point of failure if the sole key is lost. Storing a backup key in a secure onboard location, such as a chart table, glovebox, or emergency toolkit, mitigates the risk of being stranded without power at a remote campsite or boat ramp.
Versatile Applications Across Marine and Automotive Setups
The compact footprint of the M-Series switch makes it a popular choice for space-constrained installations. This replacement key supports ongoing maintenance and operational readiness across a variety of applications:
- Marine Vessels: Ideal for tinnies, yachts, and powerboats utilising M-Series switches for start and house battery isolation.
- Caravans and Campers: Provides peace of mind for off-grid tourers relying on removable key switches to manage auxiliary 12V or 24V battery systems.
- Commercial and Fleet Vehicles: Ensures operators have a reliable backup for equipment lockouts and safety isolation protocols.
Secure Your Backup Power Access
Avoid the inconvenience and safety hazards of an inoperable battery isolator. Add the Blue Sea M-Series Spare Key to your onboard spares kit today to ensure dependable access to your electrical system whenever you head off-grid or out on the water.
SKU: BS-7900B
SPECIFICATIONS
| Specification | Details |
|---|---|
| Product type | Spare key |
| Compatible range | M-Series battery switch |
| Colour | Red |
| SKU: | BS-7900B |
| Model #: | BS-7900B |
| MPN: | BS-7900B |
| Package weight: | 0.012 kg |
| Package length: | 0.06 m |
| Package width: | 0.03 m |
| Package height: | 0.02 m |
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.

