{"product_id":"fuse-tclass-kit","title":"Class T Fuse Kit (400A) - for TITAN 460Ah \u0026 High-Current Installs","description":"\u003cp style=\"text-align: center; font-size: 1.2em; font-weight: bold;\"\u003e400A peak · 320A continuous · 125V DC · 20kA AIC · Ignition-Protected\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003eRecommended for the TITAN 460Ah and any install with sustained currents above 250A.\u003c\/p\u003e\n\u003ch2\u003eWhat's in the kit\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × Blue Sea 5502100 Class T Fuse Block (with insulating cover)\u003c\/li\u003e\n  \u003cli\u003e1 × Blue Sea 5121 400A Class T Fuse\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eClass T fuses have an extremely fast short-circuit response and the highest interrupt capacity available in this size class — 20,000A AIC, double the rating of an MRBF. The right choice for high-power inverters, large house banks, and any install where the cabling and BMS allow continuous discharge above 250A.\u003c\/p\u003e\n\u003ch2\u003eWhy Class T over MRBF for the 460Ah\u003c\/h2\u003e\n\u003cp\u003eThe TITAN 460Ah has a higher continuous discharge ceiling than our standard packs. A 300A MRBF can be the limiting factor — the Class T's 320A continuous (400A peak) headroom keeps the fuse out of the discharge path until something genuinely goes wrong.\u003c\/p\u003e\n\u003caside style=\"margin: 28px 0; padding: 22px 24px; background: rgba(0,182,180,0.06); border: 1px solid rgba(0,182,180,0.28); border-radius: 6px; color: #f5f5f7;\"\u003e\n  \u003cdiv style=\"display: inline-flex; align-items: center; gap: 10px; font-size: 11px; font-weight: 600; letter-spacing: 0.22em; text-transform: uppercase; color: #00B6B4; margin-bottom: 14px;\"\u003e\n    \u003cspan style=\"display:inline-block; width:7px; height:7px; background:#00B6B4; box-shadow:0 0 10px #00B6B4; border-radius:50%;\"\u003e\u003c\/span\u003e\n    Why two amperage figures?\n  \u003c\/div\u003e\n  \u003cp style=\"margin: 0 0 12px; line-height: 1.6;\"\u003eBlue Sea's product name says \u003cstrong\u003e“225 to 400A”\u003c\/strong\u003e but the spec table says \u003cstrong\u003e320A maximum amperage\u003c\/strong\u003e. Both are correct — they describe different things:\u003c\/p\u003e\n  \u003cul style=\"margin: 0 0 14px 18px; padding: 0; line-height: 1.65;\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e225–400A\u003c\/strong\u003e — the range of \u003cem\u003efuse sizes\u003c\/em\u003e that physically fit and are listed-compatible with this block. You can install a 225, 250, 300, 350, or 400A Class T fuse in it.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003e320A\u003c\/strong\u003e — the \u003cem\u003eholder's own continuous current rating\u003c\/em\u003e per ABYC E-11 \/ UL 489. This is the limit on what current can flow through the studs and copper block sustainedly without overheating.\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003cp style=\"margin: 0 0 12px; line-height: 1.6;\"\u003eThe two numbers reconcile via the marine industry's \u003cstrong\u003e“80 % continuous” rule\u003c\/strong\u003e: a fuse should not carry more than 80 % of its rating continuously. \u003cstrong\u003e400A × 0.80 = 320A\u003c\/strong\u003e, which is exactly the holder's continuous rating. They're saying the same thing two ways.\u003c\/p\u003e\n  \u003cp style=\"margin: 0; line-height: 1.6; color: rgba(245,245,247,0.75); font-size: 0.95em;\"\u003e\u003cstrong\u003eFor a TITAN 460Ah\u003c\/strong\u003e (300A continuous BMS), the 400A Class T is the correct sizing — the BMS will trip first on a sustained overload, and the fuse only blows on a genuine short circuit (where it can interrupt up to 20,000A).\u003c\/p\u003e\n\u003c\/aside\u003e\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\u003e400A peak \/ 320A continuous (300A inside engine spaces)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaximum voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e125V DC (fuse) · 160V DC (block)\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\u003e20,000A @ 125V DC\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\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCable size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 4\/0 AWG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTerminal studs\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eM8 (5\/16\"-18) · stainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMounting\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eM6 \/ 1\/4\" hardware\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBase material\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUL 94-V0 (high-heat resistant)\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~0.64 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eManufacturer\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBlue Sea Systems (PN 5121 + 5502100)\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=\"\/de\/products\/fuse-tclass-block\"\u003eClass T Fuse Block\u003c\/a\u003e · \u003ca href=\"\/de\/products\/fuse-tclass-400a\"\u003eClass T 400A Fuse\u003c\/a\u003e\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eTechnical reference\u003c\/h3\u003e\u003cp style=\"font-size:0.9em;color:#888;\"\u003eDrawings \u0026amp; curves sourced from Blue Sea Systems product documentation.\u003c\/p\u003e\u003cfigure style=\"margin: 28px 0;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0884\/4253\/6201\/files\/5112-5121_dim.jpg?v=1777480112\" alt=\"Class T fuse dimensioned drawing — Blue Sea Systems 5112–5121\" 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;\"\u003eClass T fuse dimensioned drawing — Blue Sea 5112–5121\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\/tclass_tcc.jpg?v=1777480112\" alt=\"Class T 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 — Class T fuses\u003c\/figcaption\u003e\u003c\/figure\u003e","brand":"Blue Sea Systems","offers":[{"title":"Default Title","offer_id":57027526983945,"sku":"FUSE-TCLASS-KIT","price":99.99,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/4253\/6201\/files\/5502100_block.jpg?v=1777480113","url":"https:\/\/titanlithium.co.uk\/de\/products\/fuse-tclass-kit","provider":"TITAN Lithium","version":"1.0","type":"link"}