Blue Sea Systems Circuit Breakers

Blue Sea Systems Circuit Breakers: Purpose-Built for Marine & Vehicle Electrical Systems

When it comes to protecting the wiring in demanding AC and DC electrical systems, few names carry more authority than Blue Sea Systems. Circuit breakers are the first line of defense against overcurrent events that can damage wiring, electronics, and — in a marine environment — put crews at serious risk. Blue Sea Systems has built its reputation on engineering these critical safety devices to perform reliably where it matters most: aboard boats, in specialized vehicles, and in other high-stakes electrical applications.

A Broad Lineup Built for Every Circuit

Blue Sea Systems' broad selection of magnetic and thermal circuit breakers includes a vast selection of main and branch circuit protection devices. Their robust design makes them ideal for marine and vehicle AC & DC electrical systems. Whether you need a compact branch breaker for a single accessory circuit or a heavy-duty main breaker for your entire electrical panel, there's a Blue Sea solution engineered for the task.

• A-Series: The industry-standard circuit breaker for Blue Sea Systems electrical panels, the A-Series features a "Trip Free" design that cannot be held "ON" during a fault current condition and meets American Boat and Yacht Council (ABYC) standards. It is UL 1077 recognized, TUV certified, CE marked for Europe, and CSA certified for Canada.
• C-Series: The C-Series large-frame design provides stud termination for 5–300A loads and delivers overcurrent protection for high-draw equipment such as inverters, bow thrusters, and windlasses — while also offering high interrupt capacity suitable for main circuit protection. Triple-pole versions can be used as 120/240 Volt AC main circuit breakers to switch both lines (hots) and neutral, and double and triple pole breakers will trip all poles if any one pole trips.
• 285-Series: Thermal circuit breakers in this series provide medium-duty circuit protection for 25 to 150 Amp loads when both switching and circuit protection are required. They combine switching and circuit breaker functions into one unit and feature a "Trip Free" design that cannot be held closed after a trip.
• Circuit Breaker Blocks (ST CLB): The ST CLB Circuit Breaker Block uses a compact, snap-in-place CLB resettable circuit breaker that makes breakers as easy to install as a fuse. The block provides flexible resettable protection for 6 to 12 circuits and is available for both common and independent DC source requirements.
• Magnetic Hydraulic Breakers: These magnetic hydraulic circuit breakers combine switching and circuit protection into a single device , offering precise, temperature-independent trip characteristics ideal for sensitive electronics.
• ELCI / Ground Fault Breakers: These devices respond to leakage of electrical current outside of the intended circuit path — often referred to as an RCBO — and an expanded line meets CFR 46 / U.S. Coast Guard requirements.

What Sets Blue Sea Systems Apart in Circuit Protection

Blue Sea Systems is a marine electrical manufacturer known for robust components that perform in demanding, corrosive environments, and the company's heritage and multiple industry recognitions reflect a focus on electrical safety, reliability, and installer-friendly design. The consistent application of the Trip-Free design across product lines is a key differentiator: these breakers incorporate a "Trip-Free" design that cannot be held on when a fault has been detected , ensuring that a breaker cannot be manually forced closed during an active fault — a critical safety feature at sea.

Surface- and panel-mount circuit breakers from Blue Sea offer resettable overcurrent protection for branch circuits and panel distribution, with trip-free designs and clear trip indication for diagnostics. Combined with compliance with ABYC and U.S. Coast Guard electrical standards, this makes them a go-to choice for professional marine electricians and serious DIY builders alike. Explore the full Blue Sea Systems brand or browse all circuit breakers to find the right protection for your system.