Sierra RK40840 Compact Marine Rocker Switch – On-On, SPDT, Maintained, No Off Position, 12/24VDC, AC Rated
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Sierra RK40840 Compact Marine Rocker Switch – On-On, SPDT, Maintained, No Off Position, 12/24VDC, AC Rated
The Sierra RK40840 is a compact On-On SPDT (Single Pole, Double Throw) rocker switch with a high-profile rocker action that delivers a crisp, positive feel with every press. Unlike most rocker switches, the RK40840 has no off position — it is always in one of two maintained on states, routing a single circuit to either of two outputs at all times. This makes it the correct choice for source selection and mode switching applications where the circuit must remain active continuously and you simply need to choose which of two paths it takes.
Its compact body fits a standard rectangular panel cutout. Rated for both AC and DC operation — 12A at 125V AC, 10A at 250V AC, and suitable for 12V and 24V DC systems — making it a versatile option for mixed AC/DC panel builds.
Key Specifications
- Part Number: 11-RK40840
- Switch Type: Compact Rocker, On-On (maintained)
- Circuit Configuration: SPDT (Single Pole, Double Throw)
- Action: Maintained both sides — no off position; always routes to one of two outputs
- AC Rating: 12A at 125V AC / 10A at 250V AC
- DC Rating: Suitable for 12V and 24V DC systems
- Panel Cutout: Standard rectangular
- Note: (On) in parentheses on any switch in this series designates a momentary position
Compatible Applications
- Source selection between two circuits where one of two outputs must always be active
- Mode switching applications where the circuit must remain energized in one direction at all times
- Marine DC panels for 12V and 24V source-selection switching
- AC circuit source selection on shore power panels
- Any panel using a standard rectangular rocker switch cutout requiring a no-off SPDT switch
Parts Desk Insights
The RK40840 is a specialized switch — choose it specifically when your application requires the circuit to always be routed to one of two outputs with no off state between them. This is the correct configuration for applications like battery bank selection, dual-source switching, or mode selection where an off state would interrupt a critical circuit. Verify your wiring diagram before ordering to confirm you need On-On rather than On-Off-On. If you need a center-off position between the two active states, the Sierra RK40850 Compact On-Off-On SPDT is the standard center-off alternative in the same compact series. For a momentary-both-sides compact switch, the Sierra RK40870 Compact (On)-Off-(On) SPDT covers dual-direction momentary applications. For a simple maintained On-Off switch, the Sierra RK40800 Compact On-Off SPST is the single-output 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.