Blue Sea Systems M-Series 2-Position Locking Battery Switch 30A – BSS-6004
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You have 30 days to request a return. All sale items are final sale.
M-Series 2-Position Locking Battery Switch – 30A
Add a layer of security to your onboard electrical system with this M-Series 2-position battery switch featuring a built-in key lock. The lock-out capability prevents unauthorized use of your vessel's battery and electrical system — ideal for marina storage, shared vessels, or any application where controlled access to battery power matters.
Rated at 30 amps, this switch is designed for smaller DC circuits and auxiliary battery management rather than high-current engine starting. The M-Series form factor is compact and panel-mount ready, fitting standard marine switch panel cutouts.
Specifications
- Positions: 2 (On / Off)
- Continuous Rating: 30A
- Series: M-Series
- Feature: Key lock (lockout capable)
- Application: Marine DC auxiliary battery control
- Part Number: BSS-6004
- SKU: BSS-6004
Best Use Cases
- Securing auxiliary or house battery circuits on marina-stored vessels
- Controlling access to DC power on shared or charter boats
- Auxiliary battery isolation for electronics, lighting, or accessory circuits
- Applications requiring a lockable On/Off switch for safety or theft deterrence
Parts Desk Insights
The BSS-6004 is the right pick when security and access control matter as much as switching function. The key lock sets it apart from standard battery switches — it's a popular choice for boats stored in public marinas or operated by multiple users. Note the 30A rating: this switch is suited for auxiliary and accessory circuits, not engine starting or high-current loads. For full dual-bank management with higher amperage, see the 4-Position 300A Battery Switch – BSS-6007 or the 4-Position 350A BSS-9001E. For remote switching, the ML Series Remote Battery Switch – BSS-7700 is worth a look.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.