Blue Sea Systems 7188 Thermal Circuit Breaker — Surface Mount 48V 120A, Ignition-Protected, Water-Resistant

Blue Sea Systems 7188 (285 Series) is a surface-mount thermal circuit breaker that combines a reliable on/off switch with automatic trip protection for 48V DC circuits up to 120A.

This compact, medium-duty breaker is made for marine and industrial use where space, safety and simplicity matter. It replaces the older 185-series units and is designed to act as both a manual switch and a protective device that visibly indicates a trip. The unit is ignition-protected, water resistant and fitted with terminal caps and face-mounted studs for straightforward installation and safer wiring. Backed by a five-year warranty, it’s intended for equipment such as windlasses, electric winches and other high-current 48V DC applications.

How does this breaker act as both a switch and circuit protector?

The 7188 serves as a manual on/off control while continuously monitoring current; when an overload or fault occurs the thermal element trips and opens the circuit. The trip-free design prevents the lever from being held in the ON position during a fault, ensuring the breaker cannot be overridden until the condition is cleared and it cools.

• Integrated lever for manual switching and visible trip indication
• Thermal sensing element that opens on overload
• Trip-free mechanism prevents forced reset under fault
• Rated for 48V DC systems at 120 amps nominal

Can I install this in an engine room or exposed marine environment?

Yes — the 7188 is ignition protected and water resistant, making it suitable for installation near gasoline engines and other marine machinery. The robust housing and terminal caps reduce the risk of accidental contact and corrosion, but standard waterproofing practices and correct placement still apply for long-term reliability.

• Ignition-protected for safe engine-room installation
• Water-resistant construction for marine exposure
• Terminal caps prevent accidental shorts and contamination
• Surface-mount form factor fits tight panels and bulkheads

What makes installation fast and user-friendly?

Terminals are located on the face of the breaker for simple access and wiring, eliminating the need to reach around a unit in confined spaces. A surface-mount design and compatibility with the earlier 185 series mean you can replace older breakers without redesigning the mounting layout.

• Face-mounted terminal studs for easy connection and inspection
• Compatible drop-in replacement for the 185-series breakers
• Connected terminal caps help maintain safe wiring during installation
• Compact footprint suited to crowded electrical panels

How durable and serviceable is this breaker over time?

The 7188 is built for repeated switching and protective operation in harsh environments. Blue Sea Systems builds marine-grade products to resist vibration, salt air and repeated thermal cycling; the five-year warranty also reflects expected long-term performance when installed and used according to specifications.

• Marine-grade materials resist corrosion and vibration
• Designed for frequent manual operation and automatic tripping
• Five-year manufacturer warranty for added confidence
• Replaceable unit-level approach simplifies service and upgrades

Who is this for: The Blue Sea Systems 7188 285 Series breaker is aimed at boat owners, marine electricians and equipment installers who need a compact, reliable 48V DC protection and switching device for high-current loads like windlasses and winches. It’s also a practical upgrade option for anyone replacing legacy 185-series breakers or looking for an ignition-protected, surface-mount solution that keeps wiring neat and safe.