Attwood Heavy-Duty On/Off Battery Switch – 200A, 12–50V DC, Removable Knob
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You have 30 days to request a return. All sale items are final sale.
Compact Heavy-Duty Battery Disconnect with Built-In Theft Deterrence
The Attwood Heavy-Duty Battery Switch delivers 200A continuous and 300A intermittent switching capacity in a compact form factor — with one standout feature: the control knob is fully removable. Pull the knob off when you leave the boat and the switch can’t be operated without it, adding a simple but effective layer of theft deterrence and unauthorized-use prevention without the complexity of a keyed switch.
Rated for 12–50V DC systems, this switch covers 12V, 24V, and 36V marine electrical systems with room to spare. Ergonomic grip surfaces make it easy to operate even with wet hands, and the removable terminal walls simplify wiring access during installation.
Key Features
- 200A continuous / 300A intermittent current rating
- Compatible with 12–50V DC systems (12V, 24V, 36V)
- Removable control knob — deters theft and unauthorized use when removed
- Compact, heavy-duty construction
- Ergonomic grip surfaces for easy operation with wet hands
- Removable terminal walls for simplified wiring access
Compatible Applications
- Marine battery isolation on powerboats, pontoons, and sailboats
- Seasonal storage battery disconnect to prevent parasitic drain
- Marina slip and trailered vessel security
- 12V, 24V, and 36V DC marine electrical systems up to 50V
- RV and motorhome battery disconnect
- Any application requiring a removable-knob theft-deterrent battery switch
Parts Desk Insights
Best use case: The Attwood battery switch is the right pick when you want theft deterrence without the hassle of a keyed switch — the removable knob is faster to operate than a key and eliminates the risk of a lost or broken key leaving you stranded. It’s particularly well-suited for trailered boats and marina slip installations where the vessel is left unattended regularly. The 12–50V rating also makes it one of the more versatile options in this class, covering 12V, 24V, and 36V systems without needing a different switch for each application.
Related disconnect switches: For a keyed battery disconnect with a more traditional ignition-style lockout, see the Moeller Battery Disconnect Switch with Key. For a lever-style disconnect with a brass case and 175A continuous rating, the Cole Hersee M284BP Battery Disconnect Switch is a solid alternative. For full dual-battery selection (1/Both/2/Off), the Cole Hersee M750BP 4-Position Dual Battery Selector Switch adds bank management capability.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 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.