Blue Sea Systems thermal circuit breaker — 48V DC 40A surface-mount, ignition-protected with visible trip

The Blue Sea Systems 7182 285 Series is a surface-mount thermal circuit breaker that combines a manual switch with automatic overcurrent protection for 48V DC systems up to 40A.

This compact, medium-duty unit is built for marine and mobile electrical setups where reliable switching and repeatable trip protection are required. Designed as a surface-mounted replacement for earlier 185-series breakers, it offers a visible trip indicator, ignition protection for gasoline-engine compartments, and face-mounted studs for straightforward wiring. Weather resistance and protective terminal caps reduce the risk of accidental shorts and make installation in exposed or confined areas practical.

How does this breaker act as both a switch and a protective device?

The 7182 integrates a manual on/off lever with a thermal trip mechanism so you can control circuits while still getting automatic overload interruption. If an overcurrent occurs the breaker opens and the lever visibly pops out; it cannot be forced back on during a fault.

• Manual lever operates like a conventional switch
• Thermal element trips under sustained overcurrent
• Visible popped lever gives instant fault indication
• Trip-free design prevents holding the circuit closed when tripped

Where can I safely install the 7182 on a boat or vehicle?

The breaker is ignition-protected and water resistant, allowing installation in many engine spaces and other exposed locations. Its surface-mount body and face-mounted studs simplify placement in panels, bulkheads, or near the load it serves.

• Engine rooms of gasoline-powered vessels (ignition protected)
• Deck or cockpit panels with surface mounting
• Near windlasses, electric winches, and heavy accessory loads
• Locations where visible trip indication is useful for troubleshooting

What electrical and mechanical details should I know before buying?

This model is rated for 48 volts DC and 40 amps continuous, making it suitable for medium-duty circuits. Terminal studs are placed on the breaker face to let you connect cables easily, and terminal caps help prevent accidental contact or shorts.

• Nominal rating: 48V DC, 40A continuous
• Surface-mount form factor and face-mounted terminal studs
• Protective terminal caps to reduce short risk
• Form-fit replacement for earlier 185-series breakers

How reliable and serviceable is the breaker over time?

Built to withstand marine environments, the 7182 offers durable construction and a five-year manufacturer warranty for peace of mind. The visible trip lever speeds diagnostics, and the unit’s drop-in compatibility eases field replacement when needed.

• Water-resistant housing suitable for exposed locations
• Ignition protection for gasoline-engine compartments
• Five-year limited warranty from Blue Sea Systems
• Direct replacement for 185-series breakers for quick swaps

Who is this for? If you operate a boat, RV, or other mobile platform and need a compact, surface-mounted breaker that functions as both a user-accessible switch and an automatic overcurrent protector, the Blue Sea Systems 7182 285 Series is aimed at electricians, installers, and owners installing or upgrading medium-duty circuits—especially for windlasses, electric winches, accessories, and other 48V DC loads where visible trip indication, ignition protection, and easy wiring are priorities.