{"product_id":"blue-sea-40a-a-series-double-pole-toggle-circuit-breaker-black","title":"Blue Sea 40A A-Series Double Pole Toggle Circuit Breaker Black","description":"\u003ch2\u003eMagnetic-Hydraulic Circuit Protection and Switching for Electrical Panels\u003c\/h2\u003e\u003cp\u003eThe \u003cstrong\u003eBlue Sea Systems A-Series 40A Double-Pole Toggle Circuit Breaker\u003c\/strong\u003e combines reliable circuit switching and overcurrent protection into a single, compact device. Designed specifically as the industry standard for Blue Sea Systems electrical panels, this breaker is suited to demanding marine, caravan, RV, and off-grid power distribution systems where safety and space efficiency are paramount.\u003c\/p\u003e\u003cp\u003eBy integrating both functions, this unit eliminates the need for separate switches and fuse holders, streamlining your switchboard layout and reducing potential failure points in your wiring harness. The black toggle actuator features clear amperage identification printed directly on the lever, allowing for rapid circuit recognition during operation or troubleshooting.\u003c\/p\u003e\u003ch3\u003eWhy Choose Magnetic-Hydraulic Technology?\u003c\/h3\u003e\u003cp\u003eUnlike standard thermal circuit breakers that rely on heat-sensitive bimetallic strips, the A-Series utilises advanced \u003cstrong\u003emagnetic-hydraulic operation\u003c\/strong\u003e. Standard thermal breakers can suffer from nuisance tripping in hot engine bays, enclosed electrical cabinets, or high-temperature Australian climates because ambient heat affects their trip threshold. Conversely, a magnetic-hydraulic mechanism responds strictly to actual current flow through a magnetic coil and hydraulic damping fluid.\u003c\/p\u003e\u003cp\u003eThis engineering ensures the 40A trip rating remains stable and predictable across a wide range of ambient temperatures. It reduces the risk of unexpected power dropouts when operating near capacity on hot days, while ensuring immediate disconnection when a genuine overload or short circuit occurs.\u003c\/p\u003e\u003ch3\u003eKey Features and Design Benefits\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSimultaneous Double-Pole Switching:\u003c\/strong\u003e Features a heavy-duty linked toggle actuator bar that mechanically connects both poles, ensuring simultaneous disconnection across both lines when tripped or manually switched off.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrip-Free Safety Mechanism:\u003c\/strong\u003e Engineered with an internal trip-free design, meaning the contacts cannot be manually held in the ON position while a fault current condition persists, protecting wiring and appliances from damage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature-Stable Performance:\u003c\/strong\u003e Magnetic-hydraulic trip mechanism is unaffected by ambient temperature fluctuations, preventing nuisance tripping in warm enclosures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVibration-Resistant Mounting:\u003c\/strong\u003e Equipped with secure brass threaded mounting inserts that provide durable, vibration-resistant installation into electrical panels across rough corrugated roads or choppy waters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact Footprint:\u003c\/strong\u003e Space-saving two-pole configuration allows for high-density multi-circuit protection within confined switchboard spaces.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eApplications in Marine, RV, and Off-Grid Systems\u003c\/h3\u003e\u003cp\u003eA double-pole circuit breaker is essential whenever two conductors must be isolated at the same time. In AC electrical systems (such as shore power inlets, inverter outputs, or generator transfers), breaking both the active and neutral conductors simultaneously is critical for safety and regulatory compliance. In DC systems, double-pole breakers are frequently utilised to isolate both positive and negative lines in sensitive electronics or isolated ground systems, or to protect dual circuits that must operate in tandem.\u003c\/p\u003e\u003cp\u003eWhether you are building a custom distribution board from scratch, upgrading an ageing marine helm, or replacing a faulty breaker in a pre-configured Blue Sea Systems panel, the BS-7239B provides dependable, professional-grade circuit management.\u003c\/p\u003e\u003ch3\u003eUpgrade Your Electrical Panel Protection\u003c\/h3\u003e\u003cp\u003eEnsure your vessel, caravan, or off-grid power system is protected against electrical faults with temperature-stable, dual-pole switching. Add the Blue Sea A-Series 40A Double-Pole Circuit Breaker to your kit today for a clean, compliant, and durable panel installation.\u003c\/p\u003e","brand":"Blue Sea","offers":[{"title":"Default Title","offer_id":43631612428349,"sku":"BS-7239B","price":77.22,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0602\/3918\/3933\/files\/blue-sea-40a-double-pole-toggle-circuit-breaker-bs-7239b.png?v=1792905124","url":"https:\/\/www.solar4rvs.com.au\/products\/blue-sea-40a-a-series-double-pole-toggle-circuit-breaker-black","provider":"Solar 4 RVs","version":"1.0","type":"link"}