{"product_id":"blue-sea-systems-7721-safety-fuse-block-for-mega-amg-fuses-ignition-protected-300a-marine-fuse-holder","title":"Blue Sea Systems 7721 Safety Fuse Block for MEGA\/AMG Fuses, Ignition Protected DIN Rail Mount","description":"\u003cp\u003eThe Blue Sea Systems 7721 is a safety fuse block built to hold MEGA\/AMG style fuses aboard gasoline or diesel powered boats. It carries a sealed, insulating cover over the fuse terminals so battery cable connections stay protected from spray, splash, and accidental contact in the harsh marine environment, while satisfying ABYC\/USCG insulation requirements for onboard electrical protection. The block is ignition protected to ISO 8846 and SAE J1171, meaning it is safe to mount in gasoline engine spaces where an arc or spark could otherwise ignite fuel vapors.\u003c\/p\u003e\u003cp\u003eConstruction is iron, finished in black, and the block mounts on a standard DIN rail for a clean, serviceable installation in a breaker panel or electrical distribution area. It is rated for 32 volts and a current rating of 300 amps, making it suitable as a high-current MEGA\/AMG fuse holder for main circuit protection such as battery feeds, bilge pump circuits, and other heavy-gauge DC runs. The insulating cover lifts off for fuse inspection or replacement without exposing live terminals during normal operation.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Blue Sea Systems\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 7721\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuse Compatibility:\u003c\/strong\u003e MEGA\/AMG fuses\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 32 Volts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurrent Rating:\u003c\/strong\u003e 300 Amps\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Type:\u003c\/strong\u003e DIN Rail Mount\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Iron\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions:\u003c\/strong\u003e 7.75 x 4 x 2 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.15 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards Met:\u003c\/strong\u003e ISO 8846, SAE J1171 (ignition protection); ABYC\/USCG insulation requirements\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 632085077211\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat fuses does the Blue Sea Systems 7721 fuse block use?\u003c\/strong\u003e The Blue Sea Systems 7721 is designed to hold MEGA\/AMG style fuses, making it a high-current block for main circuit protection rather than a standard blade fuse holder.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 7721 fuse block ignition protected?\u003c\/strong\u003e Yes, it is ignition protected to ISO 8846 and SAE J1171, which qualifies it for installation aboard gasoline powered boats where a spark near fuel vapors would be a hazard.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat voltage and amperage is the 7721 rated for?\u003c\/strong\u003e The Blue Sea Systems 7721 is rated for 32 volts with a current rating of 300 amps, sized for heavy-gauge DC circuits such as battery feeds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the fuse block made of?\u003c\/strong\u003e It is constructed of iron with a black finish, and includes a sealed insulating cover over the fuse terminals.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is the 7721 mounted?\u003c\/strong\u003e The 7721 uses a DIN rail mount, so it installs onto a standard DIN rail inside a breaker panel or electrical distribution enclosure.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 7721 meet ABYC and USCG requirements?\u003c\/strong\u003e Yes, the Blue Sea Systems 7721 satisfies ABYC\/USCG insulation requirements thanks to its sealed, insulating cover over the fuse terminals.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 7721 fuse block?\u003c\/strong\u003e The Blue Sea Systems 7721 measures 7.75 x 4 x 2 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 7721 fuse block weigh?\u003c\/strong\u003e It weighs 0.15 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 7721 be used on a diesel boat as well as a gasoline boat?\u003c\/strong\u003e Yes, the Blue Sea Systems 7721 is built for installation aboard gasoline or diesel powered boats, with the ignition-protected design mattering most on gasoline engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy does the fuse block have a cover instead of open terminals?\u003c\/strong\u003e The sealed cover on the 7721 protects the fuse terminals from splash and spray in the marine environment and keeps the connections insulated to meet ABYC\/USCG requirements.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a single fuse position or a multi-circuit block?\u003c\/strong\u003e The Blue Sea Systems 7721 is a single MEGA\/AMG fuse holder rather than a multi-circuit fuse block, intended for one high-current circuit at a time.\u003c\/p\u003e","brand":"Blue Sea Systems","offers":[{"title":"Default Title","offer_id":48989574168795,"sku":"BSS-7721","price":44.81,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/7721.jpg?v=1784507251","url":"https:\/\/www.goodvibesmarina.com\/products\/blue-sea-systems-7721-safety-fuse-block-for-mega-amg-fuses-ignition-protected-300a-marine-fuse-holder","provider":"Good Vibes Marina","version":"1.0","type":"link"}