{"product_id":"kllu4000","title":"KLLU4000 - 4000Amp Fuse","description":"\u003cp\u003e\u003cstrong\u003eKLLU4000 - 4000Amp Fuse\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWhen your electrical system calls for a 4000A Class L time-delay fuse, the catalog number is only the first step in verifying compatibility. The KLLU4000 is a high-amperage, current-limiting fuse with bolt-in construction, a maximum rating of 600VAC and 300VDC, and a time-delay opening characteristic. The manufacturer also identifies the KLLU Series as UL Listed and states that it meets or exceeds UL requirements for Class L fuses. For a replacement or new application, confirm the full set of electrical and physical requirements—including amperage, Class L configuration, voltage, interrupting capacity, time-delay characteristics, and bolt-in mounting—rather than relying on the 4000A rating alone.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Features and Benefits\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e4000A continuous current rating for equipment designed around a 4000-amp Class L fuse.\u003c\/li\u003e\n\u003cli\u003eClass L configuration provides a defined fuse class for accurate application and replacement matching.\u003c\/li\u003e\n\u003cli\u003eThe time-delay opening characteristic is designed for circuits where you must account for temporary starting current.\u003c\/li\u003e\n\u003cli\u003eThe manufacturer specifies a minimum 10-second time delay at 500% of the fuse rating, helping prevent unnecessary operation during heavy starting currents from large motors and other inductive loads.\u003c\/li\u003e\n\u003cli\u003eThe current-limiting design helps reduce short-circuit damage to systems and equipment.\u003c\/li\u003e\n\u003cli\u003eHandles AC applications up to 600VAC.\u003c\/li\u003e\n\u003cli\u003eAlso rated for DC applications up to 300VDC, when all other system requirements are satisfied.\u003c\/li\u003e\n\u003cli\u003eBolt-in mounting makes the physical connection style another straightforward specification to verify before installation.\u003c\/li\u003e\n\u003cli\u003eNon-indicating design matches applications that specifically call for this configuration.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCatalog Number:\u003c\/strong\u003e KLLU4000\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Description:\u003c\/strong\u003e FUS 600V T\/D CLASS L 4000A\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e KLLU\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Time-Delay Current-Limiting Fuse\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContinuous Current Rating:\u003c\/strong\u003e 4000A\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum AC Voltage:\u003c\/strong\u003e 600VAC\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum DC Voltage:\u003c\/strong\u003e 300VDC\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAC Interrupting Rating:\u003c\/strong\u003e 200,000A at 600VAC\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDC Interrupting Rating:\u003c\/strong\u003e 20,000A at 300VDC\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOpening Characteristic:\u003c\/strong\u003e Slo-Blo \/ Time Lag (T) \/ Time Delay\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecified Time Delay:\u003c\/strong\u003e Minimum 10 seconds at 500% of rated current\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuse Class:\u003c\/strong\u003e Class L\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFamily Style:\u003c\/strong\u003e Current Limiting\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction \/ Size:\u003c\/strong\u003e Bolt-In\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndicating:\u003c\/strong\u003e No\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Method:\u003c\/strong\u003e Bolt-In\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eMaterial Compliance and Certifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe manufacturer identifies the KLLU Series as UL Listed, time-delay Class L fuses and states that the series meets or exceeds UL requirements for Class L fuses. The supplied information for KLLU4000 further identifies it as a 4000A Class L fuse with current-limiting characteristics, time-delay operation, and bolt-in mounting.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhere It Works Best\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe KLLU4000 4000A Class L fuse suits electrical equipment designed for a 4000A, time-delay, current-limiting Class L fuse with bolt-in mounting. The manufacturer specifically identifies motor branch-circuit protection as an application for the KLLU Series. Its minimum 10-second time delay at 500% of rating is intended to accommodate the heavy starting currents associated with large motors and other inductive loads. At the same time, its current-limiting characteristic is designed to reduce short-circuit damage to equipment and systems.\u003cbr\u003e\u003c\/p\u003e\n\u003cdiv\u003e\n\u003cbr\u003e\n\u003cdiv\u003e\n\u003cblockquote\u003e\n\u003cp style=\"font-size: 12px;\"\u003e\u003cem\u003eUse of Original Equipment Manufacturer (OEM) trademarks, names, and logos is for informational and identification purposes only. This does not imply any affiliation, sponsorship, endorsement, or approval by the original equipment manufacturer.\u003cstrong\u003e CIRCUIT BREAKER SUPERSTORE®\u003c\/strong\u003e is an independent reseller and is \u003cstrong\u003enot \u003c\/strong\u003ean authorized distributor, affiliate, or representative of any manufacturer. Manufacturer warranties do \u003cstrong\u003enot\u003c\/strong\u003e apply unless expressly stated. All trademarks and registered trademarks are the property of their respective owners.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp style=\"font-size: 12px;\"\u003e\u003cem\u003eLittelfuse® is a registered trademark of Littelfuse, Inc. Products sold are surplus, used, or refurbished and are \u003cstrong\u003eNOT \u003c\/strong\u003esupplied by Littelfuse, Inc. or its affiliates.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/blockquote\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Littelfuse","offers":[{"title":"New In Box","offer_id":50459228045611,"sku":"KLLU4000","price":0.0,"currency_code":"USD","in_stock":false},{"title":"Refurbished","offer_id":50459228078379,"sku":"KLLU4000  [R]","price":0.0,"currency_code":"USD","in_stock":false}],"url":"https:\/\/store.circuitbreakersuperstore.com\/products\/kllu4000","provider":"CIRCUIT BREAKER SUPERSTORE®","version":"1.0","type":"link"}