Cole Hersee M750BP 4-Position Dual Battery Selector Switch – 310A, Marine UL Listed
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Full Dual-Battery Control in a Single Heavy-Duty Switch
The Cole Hersee M750BP is a four-position dual battery selector switch that gives you complete control over a two-battery electrical system from a single point. Select Battery 1, Battery 2, Both batteries simultaneously, or cut all power at the source with the Off position. It’s the standard solution for boats with separate starting and house battery banks — letting you isolate, combine, or switch between banks without tools or additional hardware.
Rated at 310A continuous and 500A intermittent across 6–36V DC systems, this switch handles the full electrical load of most marine applications without breaking a sweat. The 3/8" copper studs provide low-resistance, high-current connections, and the switch is both ignition protected and Marine UL Listed — meeting the compliance requirements for installation in fuel vapor–prone areas on certified vessels.
Key Features
- 4 positions: Off – Battery 1 – Both – Battery 2
- 310A continuous / 500A intermittent current rating
- Compatible with 6–36V DC systems
- 3/8" copper studs for high-current, low-resistance connections
- Ignition protected — safe for installation near fuel systems
- Marine UL Listed
- Plastic case, knob, and insulator construction
- 6" flange diameter; 2-5/8" overall height
- Surface mount or panel mount (requires 3-5/16" diameter hole)
Compatible Applications
- Dual-battery systems with separate starting and house banks
- Powerboats, sailboats, and pontoons with two battery banks
- RVs and motorhomes with dual battery setups
- Commercial and work vessels requiring battery bank selection
- 12V and 24V DC marine electrical systems up to 36V
- Installations requiring ignition-protected battery switching
Parts Desk Insights
Best use case: The M750BP is the right switch for any dual-battery installation where you want manual control over which bank powers the boat — run on Battery 1 while underway, switch to Battery 2 for house loads at anchor, or combine both for engine cranking when a bank is low. The 310A continuous rating handles full electrical system loads including high-draw accessories, and the Marine UL listing satisfies insurance and ABYC compliance requirements for battery switch installations on certified vessels. The Both position is particularly useful for emergency starting when one bank is depleted.
Related products: For a simple On/Off master disconnect without battery selection, see the Cole Hersee 880062BP SR Series Master Battery Disconnect Switch. For automatic dual-battery charging management without manual switching, the Blue Sea Systems BatteryLink ACR Automatic Charging Relay is a popular companion or alternative.
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.