Blue Sea 4321-BSS
4-position breaker panel
Four illuminated 15A breaker positions, a protected 12V accessory socket and dual USB charger.
View exact panelBlue Sea Water-Resistant Panels: 4321, 4322, 4365 & 4366
Blue Sea's water-resistant control panels are available as multi-circuit switch panels or compact power and monitoring stations. The gray 4321 and 4322 share external dimensions but supply different functions; the black 4365 and 4366 are shorter accessory panels. Compare the exact part numbers, included components and mounting space before selecting a replacement.
Which panel arrangement suits your electrical system?
Important: All four listed panels are for nominal 12V DC systems. Water resistance is not a claim that panels can be submerged, and the circuit protection, wire gauge, mounting cutout and connected load must be checked against the exact installation drawing.
Blue Sea 4321, 4322, 4365 and 4366 comparison
The panel dimensions below are listed external height, width and depth. Use the manufacturer's cutout or mounting drawing rather than those outside measurements to drill a panel opening.
| MPN | Configuration | Included functions | H × W × D |
|---|---|---|---|
| 4321-BSS | 4-position breaker panel | 12V socket and dual USB charger | 6.625 × 4.625 × 1.75 in |
| 4322-BSS | 6-position breaker panel | Six breaker switches; no USB listed | 6.625 × 4.625 × 1.75 in |
| 4365-BSS | Accessory/charging panel | 12V socket and two dual USB chargers | 2.25 × 6.61 × 2.53 in |
| 4366-BSS | Accessory/monitoring panel | 12V socket, dual USB charger and voltmeter | 2.25 × 6.61 × 2.75 in |
Two types of electrical panel
4321 and 4322: These taller gray multi-circuit panels are designed for exposed-mount switching. They use illuminated 15A circuit breakers with fast-on terminals. The 4321 includes separate 12V socket and USB charging components, while the 4322 dedicates the panel to six switch positions. Their listed exterior dimensions are the same, but their controls differ.
4365 and 4366: These wider, shorter black panels use one illuminated 15A circuit breaker switch and a pre-wired harness. The 4365 emphasizes multiple USB charging outputs. The 4366 combines charging with voltage monitoring via a mini OLED display. Verify the available depth behind the mounting surface, especially when replacing one version with another.
Blue Sea water-resistant switch and accessory panels
Blue Sea 4322-BSS
6-position breaker panel
Six illuminated 15A switching circuits in the same listed external dimensions as model 4321.
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Blue Sea 4365-BSS
Accessory/charging panel
One 15A breaker switch with 12V socket and two 2.1A dual USB modules.
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Blue Sea 4366-BSS
Accessory/monitoring panel
One 15A breaker switch, 12V socket, dual USB charger and mini OLED DC voltmeter.
View exact panelInstallation and wiring checks
Disconnect the circuit, identify the electrical loads and verify the panel's exact mounting drawing before modifying the boat. Provide suitable wiring and overcurrent protection and follow the manufacturer's polarity and terminal diagrams. Keep electrical connections dry, securely supported and serviceable.
For individual controls instead of a panel assembly, see the Blue Sea push-button switch guide. For battery-side power protection and distribution, see the battery fuse, switch and busbar reference.
Common questions
Are 4321 and 4322 interchangeable because their sizes match?
No. The 4321 includes four switch positions plus a 12V socket and dual USB charger; the 4322 uses six switch positions. Match the intended functions and mounting/wiring requirements.
Does 4366 have two dual USB modules like 4365?
No. The 4366 has one dual USB charging module and a mini OLED voltmeter. The 4365 provides two dual USB modules but no built-in voltmeter.
Does a 15A breaker switch make every attached circuit suitable for 15A?
No. The correct connected device, wiring and protective devices must all be checked for the electrical load and application.
Can I view or pick up a panel in Kelowna?
UsedRVParts offers viewing and local pickup by appointment. Confirm the chosen item before arranging a visit.
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