{"product_id":"bussmann-lsp-rk-400sp-400a-class-rk1-low-peak-dual-element-time-delay-fuse","title":"Bussmann LPS‑RK‑400SP — 400A Class RK1 Low‑Peak Dual‑Element Time‑Delay Fuse","description":"\u003ch2\u003e\u003cstrong\u003eProduct Description\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThe \u003cstrong\u003eBussmann LPS‑RK‑400SP\u003c\/strong\u003e is a \u003cstrong\u003e400‑amp, Class RK1, Low‑Peak, dual‑element, time‑delay fuse\u003c\/strong\u003e engineered for superior short‑circuit and overload protection in industrial electrical systems. As part of Bussmann’s \u003cstrong\u003eLow‑Peak LPS‑RK‑SP series\u003c\/strong\u003e, this fuse delivers exceptional current‑limiting performance, reducing fault energy and helping protect downstream equipment such as switchgear, motor control centers, and heavy‑duty machinery.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIts \u003cstrong\u003edual‑element design\u003c\/strong\u003e allows for reliable time‑delay operation—ideal for handling high inrush currents from motors, transformers, and inductive loads—while still reacting quickly to sustained overloads. Built for demanding commercial and industrial environments, this fuse is UL Listed, CSA Certified, and fully compatible with Class R fuse blocks.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e⭐ \u003cstrong\u003eKey Features \u0026amp; Benefits\u003c\/strong\u003e\n\u003c\/h2\u003e\n\u003cul role=\"list\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003e400A Class RK1 fuse\u003c\/strong\u003e for high‑capacity industrial circuits\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eLow‑Peak current‑limiting design\u003c\/strong\u003e reduces let‑through energy\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eDual‑element time‑delay\u003c\/strong\u003e supports motor and inductive load startup\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eSuperior short‑circuit protection\u003c\/strong\u003e compared to standard RK5 fuses\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eCompatible with Class R fuse blocks\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eUL Listed \/ CSA Certified\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eHigh‑reliability Bussmann construction\u003c\/strong\u003e for harsh environments\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e🔧 \u003cstrong\u003eUses \/ Applications\u003c\/strong\u003e\n\u003c\/h2\u003e\n\u003cul role=\"list\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eIndustrial motor circuits\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eLarge HVAC and chiller systems\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eManufacturing equipment\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003ePump stations\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eSwitchboards and MCCs\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eTransformers and distribution panels\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eGeneral heavy‑duty branch‑circuit protection\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv role=\"group\" aria-label=\"Scrollable table\" tabindex=\"0\"\u003e\n\u003ch2\u003e📊 \u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\n\u003c\/h2\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv role=\"group\" aria-label=\"Scrollable table\" tabindex=\"0\"\u003e\n\u003ctable style=\"width: 100.08%; height: 235.166px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"height: 19.5972px;\"\u003e\n\u003cth scope=\"col\" style=\"width: 25.632%; height: 19.5972px;\"\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth scope=\"col\" style=\"width: 71.6502%; height: 19.5972px;\"\u003e\u003cstrong\u003eDetail\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.5972px;\"\u003e\n\u003cth scope=\"row\" style=\"width: 25.632%; height: 19.5972px;\"\u003eManufacturer\u003c\/th\u003e\n\u003ctd style=\"width: 71.6502%; height: 19.5972px;\"\u003eBussmann \/ Eaton Bussmann\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5972px;\"\u003e\n\u003cth scope=\"row\" style=\"width: 25.632%; height: 19.5972px;\"\u003eSeries\u003c\/th\u003e\n\u003ctd style=\"width: 71.6502%; height: 19.5972px;\"\u003eLPS‑RK‑SP (Low‑Peak)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5972px;\"\u003e\n\u003cth scope=\"row\" style=\"width: 25.632%; height: 19.5972px;\"\u003ePart Number\u003c\/th\u003e\n\u003ctd style=\"width: 71.6502%; height: 19.5972px;\"\u003eLPS‑RK‑400SP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5972px;\"\u003e\n\u003cth scope=\"row\" style=\"width: 25.632%; height: 19.5972px;\"\u003eAmp Rating\u003c\/th\u003e\n\u003ctd style=\"width: 71.6502%; height: 19.5972px;\"\u003e400A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5972px;\"\u003e\n\u003cth scope=\"row\" style=\"width: 25.632%; height: 19.5972px;\"\u003eVoltage Rating\u003c\/th\u003e\n\u003ctd style=\"width: 71.6502%; height: 19.5972px;\"\u003e600V AC \/ 300V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5972px;\"\u003e\n\u003cth scope=\"row\" style=\"width: 25.632%; height: 19.5972px;\"\u003eClass\u003c\/th\u003e\n\u003ctd style=\"width: 71.6502%; height: 19.5972px;\"\u003eRK1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5972px;\"\u003e\n\u003cth scope=\"row\" style=\"width: 25.632%; height: 19.5972px;\"\u003eType\u003c\/th\u003e\n\u003ctd style=\"width: 71.6502%; height: 19.5972px;\"\u003eDual‑Element, Time‑Delay\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5972px;\"\u003e\n\u003cth scope=\"row\" style=\"width: 25.632%; height: 19.5972px;\"\u003eInterrupt Rating\u003c\/th\u003e\n\u003ctd style=\"width: 71.6502%; height: 19.5972px;\"\u003eHigh current‑limiting (typical of Low‑Peak series)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5972px;\"\u003e\n\u003cth scope=\"row\" style=\"width: 25.632%; height: 19.5972px;\"\u003eBody Style\u003c\/th\u003e\n\u003ctd style=\"width: 71.6502%; height: 19.5972px;\"\u003eCartridge Fuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5972px;\"\u003e\n\u003cth scope=\"row\" style=\"width: 25.632%; height: 19.5972px;\"\u003eCertifications\u003c\/th\u003e\n\u003ctd style=\"width: 71.6502%; height: 19.5972px;\"\u003eUL Listed, CSA Certified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5972px;\"\u003e\n\u003cth scope=\"row\" style=\"width: 25.632%; height: 19.5972px;\"\u003eCompatibility\u003c\/th\u003e\n\u003ctd style=\"width: 71.6502%; height: 19.5972px;\"\u003eClass R fuse blocks\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv role=\"group\" aria-label=\"Scrollable table\" tabindex=\"0\"\u003e\n\u003ch2\u003e🔄 \u003cstrong\u003eCross‑Reference \/ Interchange Table\u003c\/strong\u003e\n\u003c\/h2\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv role=\"group\" aria-label=\"Scrollable table\" tabindex=\"0\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth scope=\"col\"\u003e\u003cstrong\u003eManufacturer\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth scope=\"col\"\u003e\u003cstrong\u003eEquivalent \/ Related Part Numbers\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eBussmann\u003c\/th\u003e\n\u003ctd\u003eLPS‑RK‑400SP (OEM)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eLittelfuse\u003c\/th\u003e\n\u003ctd\u003eFLSR400 (verify voltage \u0026amp; interrupt rating)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eMersen \/ Ferraz Shawmut\u003c\/th\u003e\n\u003ctd\u003eA4BQ400 (verify application match)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eGeneral Replacement\u003c\/th\u003e\n\u003ctd\u003eMatch by \u003cstrong\u003eClass RK1\u003c\/strong\u003e, \u003cstrong\u003e400A\u003c\/strong\u003e, \u003cstrong\u003e600V\u003c\/strong\u003e, \u003cstrong\u003etime‑delay\u003c\/strong\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv role=\"group\" aria-label=\"Scrollable table\" tabindex=\"0\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"E166","offers":[{"title":"Default Title","offer_id":48878640791771,"sku":"WALL NND31B","price":99.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0504\/9578\/3088\/files\/rn-image_picker_lib_temp_a2a1f699-cf1b-409a-8ff7-370eb2bfe620.jpg?v=1781552616","url":"https:\/\/freemanliquidators.com\/products\/bussmann-lsp-rk-400sp-400a-class-rk1-low-peak-dual-element-time-delay-fuse","provider":"Freeman Liquidators","version":"1.0","type":"link"}