{"product_id":"blue-sea-40a-187-series-surface-mount-thermal-circuit-breaker","title":"Blue Sea 40A 187-Series Surface Mount Thermal Circuit Breaker","description":"\u003ch2\u003eHeavy-Duty 40A Circuit Protection and Switching for Harsh Environments\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eBlue Sea 187-Series 40A Surface Mount Thermal Circuit Breaker\u003c\/strong\u003e delivers dependable overcurrent protection and manual switching in a single, compact unit. Engineered specifically for demanding marine, RV, caravan, and off-grid DC electrical systems, this breaker safeguards your wiring and high-draw appliances from damaging short circuits and thermal overloads. By combining switching and circuit protection into one device, it eliminates the need for separate inline fuse holders and isolation switches, streamlining your electrical board layout and reducing potential points of failure.\u003c\/p\u003e\n\n\u003ch3\u003eEngineered for Marine Safety and Durability\u003c\/h3\u003e\n\u003cp\u003eWhen installing electrical components in enclosed engine bays, battery lockers, or marine compartments, safety is paramount. This \u003cstrong\u003e40A thermal circuit breaker\u003c\/strong\u003e is fully ignition protected, making it safe for installation aboard petrol-powered boats where stray sparks from standard, unsealed electrical components could ignite fuel vapours. Furthermore, its robust, weatherproof housing protects the internal thermal trip mechanism against moisture, salt spray, dust, and vibration, ensuring long-term operational integrity across harsh Australian conditions.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features and Benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual-Function Design:\u003c\/strong\u003e Combines reliable 40A thermal overcurrent protection with manual on\/off switching capabilities in one robust unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Visibility Reset Lever:\u003c\/strong\u003e Features a bright yellow actuator lever that provides clear visual indication of the circuit status (tripped or closed) and allows for quick manual resets or circuit isolation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIgnition Protected:\u003c\/strong\u003e Safe for installation in marine engine compartments and spaces housing petrol fuel systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeatherproof Construction:\u003c\/strong\u003e Sealed housing resists moisture and dust ingress, making it ideal for exposed marine decks, 4WD canopies, and camper trailers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy-Duty Stud Terminals:\u003c\/strong\u003e Large threaded studs accommodate heavy-gauge ring terminals, ensuring low-resistance, high-current connections that resist loosening under vibration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSimple Surface Mounting:\u003c\/strong\u003e Integrated mounting holes allow for straightforward installation onto flat panels, bulkheads, or battery distribution boards without requiring complex panel cutouts.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSuperior Reliability Over Standard Fuse Holders\u003c\/h3\u003e\n\u003cp\u003eUnlike single-use blade or MIDI fuses that require spare parts to restore power after an overload fault, this resettable \u003cstrong\u003esurface mount circuit breaker\u003c\/strong\u003e allows you to quickly troubleshoot the issue and restore power with the flip of a lever. Compared to inferior, unsealed breakers that are prone to premature tripping due to ambient heat, voltage drop, or terminal corrosion, the Blue Sea Systems 187-Series maintains strict calibration and firm contact pressure. The trip-free design also ensures the internal contacts cannot be manually held closed during an active fault condition, significantly reducing the risk of cable overheating or electrical fires.\u003c\/p\u003e\n\n\u003ch3\u003eIdeal Applications\u003c\/h3\u003e\n\u003cp\u003eThis 40A breaker is exceptionally versatile and suited to a wide range of 12V, 24V, and 48V DC electrical installations:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMain circuit protection for auxiliary battery systems in 4WDs, caravans, and motorhomes\u003c\/li\u003e\n\u003cli\u003eProtecting high-current marine accessories such as bilge pumps, winches, and bow thrusters\u003c\/li\u003e\n\u003cli\u003eIsolating DC-DC chargers, solar charge controllers, and inverter feed lines\u003c\/li\u003e\n\u003cli\u003eHeavy-duty automotive, commercial vehicle, and off-grid power distribution boards\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eUpgrade Your Electrical Protection\u003c\/h3\u003e\n\u003cp\u003eEnsure your mobile or marine power system is protected against unexpected electrical faults. Add the Blue Sea 187-Series 40A Surface Mount Thermal Circuit Breaker to your installation for dependable, resettable circuit protection.\u003c\/p\u003e","brand":"Blue Sea","offers":[{"title":"Default Title","offer_id":43631588966461,"sku":"BS-7138B","price":167.82,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0602\/3918\/3933\/files\/blue-sea-187-series-40a-surface-mount-circuit-breaker-bs-7138b.png?v=1792904306","url":"https:\/\/www.solar4rvs.com.au\/products\/blue-sea-40a-187-series-surface-mount-thermal-circuit-breaker","provider":"Solar 4 RVs","version":"1.0","type":"link"}