Blue Sea Battery M Replacement Switch Knob, Red
Blue Sea Battery M Replacement Switch Knob, Red
Genuine OEM Rotary Actuator with White Indicator (Switch Not Included)

DESCRIPTION
Restore Safe and Reliable Operation to Your m-Series Battery Switch
Maintaining complete control over your DC power distribution is critical in marine, automotive, and off-grid environments. The genuine Blue Sea Systems m-Series replacement switch knob is engineered to restore full functionality to your existing battery isolator without the expense or downtime of replacing the entire switch unit. Featuring a high-visibility red finish and a clear white indicator pointer, this rotary actuator ensures you can verify your power status at a glance, even in dimly lit lockers or engine bays.
Please note that this component is the replacement rotary knob only and does not include the complete battery switch assembly. It is designed specifically as a direct-fit spare part for the Blue Sea Systems m-Series (Mini) battery switch range, commonly utilised in 12V, 24V, and 48V DC electrical systems.
Key Features and Benefits
- Genuine OEM Fitment: Engineered to exact factory tolerances for seamless compatibility with Blue Sea Systems m-Series battery switches.
- High-Visibility Design: The vivid red housing paired with a contrasting white indicator line provides immediate visual confirmation of the switch position.
- Ergonomic Grip: Contoured edges allow for positive, slip-free actuation when isolating or combining battery banks, even with wet or gloved hands.
- Marine-Grade Durability: Constructed from robust, impact-resistant materials capable of withstanding harsh UV exposure, salt spray, and engine room temperatures.
- Cost-Effective Maintenance: Allows for quick field repairs of damaged or misplaced actuators without disturbing existing heavy-gauge cabling or mounting hardware.
Why Choose a Genuine OEM Replacement Actuator?
In demanding mobile and marine electrical setups, the integrity of your battery isolation switch is paramount. Over time, original switch knobs can become damaged due to accidental impacts, prolonged UV exposure, or simply get misplaced during routine maintenance and winterisation. Attempting to operate a battery switch without the proper knob, or substituting an ill-fitting aftermarket part, introduces unnecessary operational risks.
Inferior alternatives often suffer from poor dimensional tolerances, leading to a loose fit that can strip the internal switch shaft or fail to engage the detent positions accurately. By selecting a genuine Blue Sea Systems replacement component, you eliminate the risk of incomplete circuit engagement, which can cause arcing, heat build-up, or unexpected power loss. Furthermore, keeping a spare actuator on board is a practical precaution for remote touring or offshore passages, ensuring you can always isolate your battery banks safely in an emergency.
Applications Across Marine and Off-Grid Systems
The m-Series range is widely respected for its compact footprint and high current capacity in tight installation spaces. This replacement knob is ideal for restoring switches located in:
- Marine vessels, including trailer boats, yachts, and commercial craft
- Caravans, camper trailers, and motorhomes
- 4WD dual battery systems and service bodies
- Compact off-grid solar enclosures and portable power stations
Maintain Your Electrical System
Ensure your battery isolation system remains safe, compliant, and easy to operate. Order your genuine Blue Sea Systems replacement knob today to complete your system maintenance or to keep on hand as an essential onboard spare.
SKU: BS-7901B
SPECIFICATIONS
| Specification | Value |
|---|---|
| Product type | Replacement knob |
| Main product or range | Battery M |
| Colour | Red |
| SKU: | BS-7901B |
| Model #: | BS-7901B |
| MPN: | BS-7901B |
| Package weight: | 0.048 kg |
| Package length: | 0.09 m |
| Package width: | 0.09 m |
| Package height: | 0.05 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.

