Blue Sea 7144 187 - Series Thermal Circuit Breaker - 100Amp

The Blue Sea 7144 187-Series Thermal Circuit Breaker – 100Amp is the marine electrician's go-to solution for reliable DC power distribution on vessels of all sizes. Whether you're running a center console, cruising in a sportfish, or powering auxiliary systems on a commercial boat, this surface-mount breaker combines switching control and overcurrent protection into a single, compact device. Built to meet SAE J1171 standards, it's engineered for the salt-spray corrosion and vibration demands of life on the water.

This 100-amp thermal breaker uses temperature-sensitive elements to detect dangerous current overload and automatically trip, cutting power before wiring or equipment sustains damage—critical protection when you're miles offshore with no immediate access to shore power or service. The thermal design offers a key advantage over magnetic-only breakers: smooth response to transient spikes (like starter motor inrush) while still protecting against sustained overload. The 187-Series form factor fits standard marine panel cutouts, and its surface-mount design makes installation and replacement straightforward in tight engine-room spaces. At just 0.2 pounds and measuring 3 x 2 x 8 inches, it adds minimal weight and footprint to your electrical system.

Boaters relying on high-amperage DC loads—electric anchor windlasses, thruster systems, large water heaters, or multiple battery banks—benefit most from the Blue Sea 7144's robust 100-amp rating and proven reliability in harsh marine environments. It pairs seamlessly with Blue Sea Systems panels and bus bars, and works alongside other J1171-compliant marine electrical components. For anyone serious about electrical safety and system longevity, this thermal circuit breaker is a no-compromise choice for main or sub-panel protection on modern vessels.