Sierra MP39310 Marine Momentary Push-Button Switch – Brass, SPST, Start/Horn
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Sierra MP39310 Marine Momentary Push-Button Switch – Brass, SPST, Start/Horn
The Sierra MP39310 is a heavy-duty momentary push-button switch built for marine helm panels. Solid brass construction delivers the corrosion resistance and durability that marine electrical systems demand. The momentary On-Off (SPST) action makes it ideal for any function that requires a brief contact closure — most commonly engine starting, horn activation, or other momentary-contact accessories on the helm.
The 5/8" diameter mounting stem is 1-1/4" long, with an overall switch length of 2-7/8", fitting a wide range of marine dash panels and switch bezels. The brass body gives it a classic, premium look that pairs well with traditional helm layouts.
Key Specifications
- Part Number: 11-MP39310
- Switch Type: Momentary Push-Button (SPST, On-Off)
- Action: Momentary contact — circuit closes when pressed, opens when released
- Construction: Solid brass
- Mounting Stem Diameter: 5/8"
- Mounting Stem Length: 1-1/4"
- Overall Length: 2-7/8"
- Typical Applications: Engine start, horn, momentary accessories
Compatible Applications
- Engine start button on helm panels using a separate ignition switch for Off/Ignition/Start functions
- Horn activation on powerboats, center consoles, and runabouts
- Any momentary-contact accessory function on a 12V or 24V DC marine electrical panel
- Classic and traditional helm layouts where brass aesthetics are preferred
- Replacement for worn or damaged OEM momentary push-button switches
Parts Desk Insights
The MP39310 is the right choice when you need a dedicated momentary push-button for engine starting or horn activation — particularly on helm setups where the ignition switch handles Off and Ignition positions only, and a separate start button is wired to the starter solenoid. The solid brass construction makes it a natural fit alongside brass ignition switches like the Sierra MP39060 Conventional Brass Ignition Switch or the Sierra MP39040 Magneto Brass Ignition Switch for a cohesive panel look. If you need a maintained On-Off switch rather than a momentary push-button, the Sierra MP39530 Push-Pull Switch is the right format for circuit control that stays on until switched off.
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.