{"product_id":"fuse-mrbf-kit","title":"MRBF Terminal Fuse Kit - fir TITAN Lithium Akkuen","description":"\u003cp style=\"text-align: center; font-size: 1.2em; font-weight: bold;\"\u003e100A-300A · 58V DC · 10kA AIC · Marine-Rated · Ignition-Protected\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003eRecommended for BS 7671 compliance on every TITAN install.\u003c\/p\u003e\n\u003ch2\u003eWhat's in the kit\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1 × Blue Sea 5191 MRBF Terminal Fuse Block\u003c\/li\u003e\n\u003cli\u003e1 × Blue Sea MRBF Terminal Fuse in your chosen rating (100A, 150A, 200A, 250A or 300A)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow-height (DIN) fitment only:\u003c\/strong\u003e 1 × Durite cargo-style positive terminal (5-100-01) with vertical stud\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eMounts directly on the M8 positive terminal of any TITAN battery. The block isolates the fuse from accidental shorts and accepts standard 5\/16\" ring terminals (or stacked terminals via the M8 stud).\u003c\/p\u003e\n\n\u003ch2\u003eStandard or Low-height (DIN)?\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eStandard\u003c\/strong\u003e mounts the fuse block upright on the battery post - the simplest install if you have clearance above the battery.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eLow-height (DIN)\u003c\/strong\u003e is for height-restricted fitments - under-seat and tray installs where the standard block won't clear. It adds a Durite cargo-style terminal that moves the connection point out towards the edge of the casing, letting the MRBF block mount inverted off the side of the battery instead of on top:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTotal height: 195mm\u003c\/strong\u003e including the terminal stud (vs ~215mm with the standard upright block on a 190mm DIN battery)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth at the fuse point: 205mm\u003c\/strong\u003e - the block sits proud of the side of the case, so allow for it in the tray\u003c\/li\u003e\n\u003cli\u003eVertical 5\/16\" Whitworth stud (M10 equivalent) with 13mm nuts - all nuts included for the terminal and the block\u003c\/li\u003e\n\u003cli\u003eSame Blue Sea block and fuse as the standard kit - nothing about the protection changes, only the mounting\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eAs with the standard kit, your main positive battery cable needs an M8 or M10 eyelet on the end to connect to the fuse holder. Most TITAN owners don't need this option - if your battery bay has normal clearance, choose Standard.\u003c\/p\u003e\n\u003ch2\u003eWhy we recommend it\u003c\/h2\u003e\n\u003cp\u003eUK caravan, motorhome and marine installs fall under \u003cstrong\u003eBS 7671\u003c\/strong\u003e, which requires a fuse capable of safely interrupting a worst-case short-circuit current. Our BMS shuts down on a short in normal use, but the regulation looks at worst case - and lithium short-circuits can theoretically reach 3,000-6,000A. Standard blade or MEGA fuses cannot interrupt that current; only marine-rated MRBF or Class T fuses are AIC-rated to do so.\u003c\/p\u003e\n\u003cp\u003eWithout a compliant fuse, an insurance claim has an easy line of defence. We sell this kit at minimal mark-up because we'd rather you were covered than not.\u003c\/p\u003e\n\n\u003ch2\u003eWhich rating should I choose?\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eNot sure? Choose 300A.\u003c\/strong\u003e It satisfies the BS 7671 worst-case short-circuit requirement without nuisance-tripping on the legitimate inrush currents a normal lithium install pulls - inverter startup spikes, induction hob ignition, electric winches, big DC-DC chargers running in parallel. It is the rating we fit by default.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWant the main fuse matched to your cable?\u003c\/strong\u003e That's what the 100A-250A options are for. Pick the lowest rating that comfortably exceeds your maximum continuous system draw, and that does not exceed the continuous rating of your main positive cable. Two checks before you go tighter:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAn MRBF fuse holds 100% of its rating and tolerates brief surges well beyond it (135% for up to about 15 minutes), so size to your continuous load, not the worst momentary spike.\u003c\/li\u003e\n\u003cli\u003eIf you run an inverter, check its startup surge against the rating - a big inverter on a tight fuse is the classic nuisance-trip.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eAll five ratings are the same physical fuse with the same 58V DC and interrupt ratings - only the trip current (and body colour) changes. The block accepts any of them without modification, so you can change rating later by swapping the fuse alone.\u003c\/p\u003e\n\n\u003ch2\u003eImportant: read before installing\u003c\/h2\u003e\n\u003cp style=\"border:1px solid #FFAB00;padding:14px 18px;margin:16px 0;\"\u003e\u003cstrong style=\"color:#FFAB00;letter-spacing:0.06em;\"\u003eHeads up.\u003c\/strong\u003e The 300A option is a short-circuit compliance fuse - not a cable-protection fuse.\u003c\/p\u003e\n\u003cp\u003eAt 300A, the fuse is \u003cem\u003enot\u003c\/em\u003e sized to protect any one specific cable or load downstream of the battery. \u003cstrong\u003eYou remain responsible for the rest of the install.\u003c\/strong\u003e In practice that means one of the following:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCabling between this fuse and your distribution \/ busbar rated for at least the fuse's rating continuous, or\u003c\/li\u003e\n\u003cli\u003eA correctly-sized secondary fuse close to each load - blade, MEGA, mini-ANL or similar - sized to the cable feeding that load.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf you're unsure how to size your install, please get in touch before fitting. We're happy to talk it through - but the duty of matching fuse rating to cable rating and load demand sits with the installer \/ owner. Don't assume 300A is the right number for your wiring just because it's the default we recommend.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFuse rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100A \/ 150A \/ 200A \/ 250A \/ 300A (select above)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaximum voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e58V DC (all ratings)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAIC (Interrupt capacity)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10,000A @ 14V DC · 5,000A @ 32V DC · 2,000A @ 58V DC (all ratings)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIgnition-protected\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eYes (when block + fuse used together)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTerminal stud\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eM8 (5\/16\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaximum torque\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8.47 Nm (75 in-lb)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCable terminations\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5\/16\" ring terminals (standard)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTotal weight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e~0.10 kg (standard) · ~0.25 kg (low-height)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLow-height fitment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e195mm total height inc stud · 205mm width at fuse point · Durite cargo terminal (5-100-01), 5\/16\" Whitworth vertical stud, 13mm nuts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eManufacturer part numbers\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBlue Sea Systems - block: 5191 · fuse: 5183 (100A) \/ 5185 (150A) \/ 5187 (200A) \/ 5189 (250A) \/ 5190 (300A)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003eSpare parts available separately: \u003ca href=\"\/lb\/products\/fuse-mrbf-block\"\u003eMRBF Terminal Fuse Block\u003c\/a\u003e · \u003ca href=\"\/lb\/products\/fuse-mrbf-300a\"\u003eMRBF Terminal Fuses (100A-300A)\u003c\/a\u003e\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eTechnical reference\u003c\/h3\u003e\n\u003cp style=\"font-size:0.9em;color:#888;\"\u003eDrawings \u0026amp; curves sourced from Blue Sea Systems product documentation. Dimensions and trip curves apply to all ratings; trip currents scale with the nominal rating.\u003c\/p\u003e\n\u003cfigure style=\"margin: 28px 0;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0884\/4253\/6201\/files\/5191_dim.jpg?v=1777480105\" alt=\"MRBF block dimensioned drawing - Blue Sea Systems 5191\" loading=\"lazy\" style=\"display:block;max-width:100%;height:auto;background:#fff;padding:8px;margin:0 auto;\"\u003e\u003cfigcaption style=\"text-align:center;font-size:0.9em;color:#888;margin-top:10px;\"\u003eFuse block dimensioned drawing - Blue Sea 5191\u003c\/figcaption\u003e\u003c\/figure\u003e\n\u003cfigure style=\"margin: 28px 0;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0884\/4253\/6201\/files\/5191_mount.jpg?v=1777480105\" alt=\"MRBF block mounting diagram - Blue Sea Systems 5191\" loading=\"lazy\" style=\"display:block;max-width:100%;height:auto;background:#fff;padding:8px;margin:0 auto;\"\u003e\u003cfigcaption style=\"text-align:center;font-size:0.9em;color:#888;margin-top:10px;\"\u003eFuse block mounting diagram - Blue Sea 5191\u003c\/figcaption\u003e\u003c\/figure\u003e\n\u003cfigure style=\"margin: 28px 0;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0884\/4253\/6201\/files\/5175-5190_dim.jpg?v=1777480105\" alt=\"MRBF terminal fuse dimensioned drawing - Blue Sea Systems 5175-5190\" loading=\"lazy\" style=\"display:block;max-width:100%;height:auto;background:#fff;padding:8px;margin:0 auto;\"\u003e\u003cfigcaption style=\"text-align:center;font-size:0.9em;color:#888;margin-top:10px;\"\u003eMRBF terminal fuse dimensioned drawing - Blue Sea 5175-5190\u003c\/figcaption\u003e\u003c\/figure\u003e\n\u003cfigure style=\"margin: 28px 0;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0884\/4253\/6201\/files\/mrbf_tcc.jpg?v=1777480105\" alt=\"MRBF terminal fuse trip-delay (time-current) curve - Blue Sea Systems\" loading=\"lazy\" style=\"display:block;max-width:100%;height:auto;background:#fff;padding:8px;margin:0 auto;\"\u003e\u003cfigcaption style=\"text-align:center;font-size:0.9em;color:#888;margin-top:10px;\"\u003eTrip-delay curve - MRBF terminal fuses\u003c\/figcaption\u003e\u003c\/figure\u003e\n","brand":"Blue Sea Systems","offers":[{"title":"300A \/ Standard","offer_id":57027526623497,"sku":"MRBF-KIT-300","price":44.99,"currency_code":"GBP","in_stock":false},{"title":"250A \/ Standard","offer_id":57174863380745,"sku":"MRBF-KIT-250","price":44.99,"currency_code":"GBP","in_stock":false},{"title":"200A \/ Standard","offer_id":57174863413513,"sku":"MRBF-KIT-200","price":44.99,"currency_code":"GBP","in_stock":false},{"title":"150A \/ Standard","offer_id":57174863446281,"sku":"MRBF-KIT-150","price":44.99,"currency_code":"GBP","in_stock":false},{"title":"100A \/ Standard","offer_id":57174863479049,"sku":"MRBF-KIT-100","price":44.99,"currency_code":"GBP","in_stock":false},{"title":"300A \/ Low-height (DIN)","offer_id":57181909713161,"sku":"MRBF-KIT-300-LH","price":52.99,"currency_code":"GBP","in_stock":false},{"title":"250A \/ Low-height (DIN)","offer_id":57181909745929,"sku":"MRBF-KIT-250-LH","price":52.99,"currency_code":"GBP","in_stock":false},{"title":"200A \/ Low-height (DIN)","offer_id":57181909778697,"sku":"MRBF-KIT-200-LH","price":52.99,"currency_code":"GBP","in_stock":false},{"title":"150A \/ Low-height (DIN)","offer_id":57181909811465,"sku":"MRBF-KIT-150-LH","price":52.99,"currency_code":"GBP","in_stock":false},{"title":"100A \/ Low-height (DIN)","offer_id":57181909844233,"sku":"MRBF-KIT-100-LH","price":52.99,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/4253\/6201\/files\/5191_block.jpg?v=1777480105","url":"https:\/\/titanlithium.co.uk\/lb\/products\/fuse-mrbf-kit","provider":"TITAN Lithium","version":"1.0","type":"link"}