Overview

The Blue Sea Systems 4155 is a WeatherDeck toggle switch with DPDT ON-OFF-ON action for DC circuits up to 30V and 5A. It uses six 0.25 in quick-connect terminals, so it fits panel wiring that uses push-on tab connections rather than screw terminals.

This switch is made for Blue Sea Systems WeatherDeck panels and is commonly used where navigation and anchor light functions share one bulb and need a center-off position. Its nickel-plated brass and phenolic construction helps it hold up in wet panel spaces where corrosion is a concern.

When it is fitted with the matching WeatherDeck toggle switch boot, the switch assembly is rated IP67 for temporary immersion up to 30 minutes. That makes it a sensible choice for open helms, center console switch panels, and other exposed mounting spots that see spray and washdowns.

Key features

• DPDT ON-OFF-ON switching for circuits that need two poles and a center-off position
• 5A maximum rating at 30V DC, which suits many 12V and 24V control circuits within that load range
• Six 0.25 in quick-connect tabs for common marine panel wiring with female disconnect terminals
• Nickel-plated brass and phenolic construction that helps resist corrosion in damp marine environments
• IP67 temporary immersion rating when used with the matching WeatherDeck toggle switch boot
• Commonly used for navigation and anchor light switching where one bulb handles both functions

Compatibility and fit

This is a panel switch for Blue Sea Systems WeatherDeck installations and other low-current DC switching jobs that call for a DPDT center-off layout. The 30V DC maximum covers nominal 12V and 24V systems, but the connected load still needs to stay within the 5A rating.

It is a good match when you need a compact toggle switch with tab terminals and clear mechanical positions instead of a sealed rocker or a heavy-load battery switch. On boats, that usually means lighting control, changeover functions, and other branch circuits where the switch handles logic or light-duty loads.

Installation and setup

For exposed mounting locations, use the matching WeatherDeck toggle switch boot so the switch opening is protected against spray and temporary immersion. In protected interior panels, the switch still benefits from its corrosion-resistant construction, but the boot is what gives the assembly its IP67 protection.

Check terminal orientation and wire routing before final installation, especially in tight helm panels where multiple quick-connect terminals sit close together. This switch is best used where panel depth, tab-terminal wiring, and the DPDT ON-OFF-ON function all line up with the circuit you are building or replacing.

Use on board

This switch suits boat owners replacing a worn WeatherDeck panel switch or building a waterproof panel around light-duty DC functions. It makes the most sense on center consoles, pilot houses, fishing boats, and workboats where an exposed switch panel still needs straightforward manual control.