{"id":5648,"date":"2026-06-11T03:49:05","date_gmt":"2026-06-11T03:49:05","guid":{"rendered":"https:\/\/materialparts.com\/0451003-mrl\/"},"modified":"2026-06-12T03:26:30","modified_gmt":"2026-06-12T03:26:30","slug":"0451003-mrl","status":"publish","type":"post","link":"https:\/\/materialparts.com\/ar\/0451003-mrl\/","title":{"rendered":"0451003.MRL"},"content":{"rendered":"

\u0646\u0638\u0631\u0629 \u0639\u0627\u0645\u0629 \u0639\u0644\u0649 \u0627\u0644\u0645\u0646\u062a\u062c<\/h2>\n

The 0451003.MRL from Littelfuse is a 3A 125VAC time-delay (slow-blow) ceramic fuse in 5x20mm package for overcurrent protection in power supplies and transformers.<\/p>\n

\u0627\u0644\u0645\u0648\u0627\u0635\u0641\u0627\u062a \u0627\u0644\u0631\u0626\u064a\u0633\u064a\u0629<\/h2>\n\n\n
\u0627\u0644\u062d\u0632\u0645\u0629<\/td>\n5x20mm ceramic<\/td>\n<\/tr>\n<\/table>\n

\u0627\u0644\u0645\u064a\u0632\u0627\u062a<\/h2>\n
    \n
  • See datasheet for complete specifications<\/li>\n
  • Industry-standard package<\/li>\n<\/ul>\n

    \u0627\u0644\u062a\u0637\u0628\u064a\u0642\u0627\u062a<\/h2>\n
      \n
    • Industrial control<\/li>\n
    • Consumer electronics<\/li>\n
    • Communication equipment<\/li>\n
    • Power management<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The 0451003.MRL from Littelfuse is a 3A 125VAC time-delay (slow-blow) ceramic fuse in 5x20mm package for overcurrent protection in power supplies and transformers. Key Specifications Package 5x20mm ceramic Features See datasheet for complete specifications Industry-standard package Applications Industrial control Consumer electronics Communication equipment Power management<\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[57,13],"tags":[],"chip_brand":[200],"class_list":["post-5648","post","type-post","status-publish","format-standard","hentry","category-insulated-gate-bipolar-transistors-igbt","category-integrated-circuits-ics","chip_brand-littelfuse"],"acf":{"brief_explanation":"3A 125VAC slow-blow fuse, 5x20mm ceramic","date_code":"","package_case":"5x20mm ceramic","in_stock":8276,"datasheet":"https:\/\/www.littelfuse.com\/media\/littelfuse\/data-sheets\/littelfuse_451_series.pdf","price":"$0.38 @ 1ku","product_introduction":"The 0451003.MRL from Littelfuse is a 3A 125VAC time-delay (slow-blow) ceramic fuse in 5x20mm package for overcurrent protection in power supplies and transformers.","working_principle":"The 0451003.MRL is a 3A 250VAC slow-blow (time-lag) ceramic fuse from Littelfuse in the standard 5x20mm cylindrical package. It is the 3A version of the 0451005.MRL (5A), sharing the same ceramic body construction and slow-blow time-current characteristic profile. The slow-blow characteristic allows short-duration inrush currents (typically 5-10x rated current for 10-100ms, such as transformer magnetizing inrush or capacitor charging) without nuisance blowing, while still providing overcurrent protection for sustained faults. The time-current characteristic: 3A (rated) = no blow; 4.5A (150%) = blows in >60 seconds; 6A (200%) = blows in 0.5-5 seconds; 15A (500%) = blows in 0.05-0.2 seconds. The ceramic body provides arc-quenching and mechanical integrity during fault interruption. The breaking capacity is 100A at 250VAC. The cold resistance is approximately 120mOhm (higher than the 5A version due to thinner fuse element), resulting in 1.08W dissipation at rated current. The 3A rating is commonly used for smaller power supplies, instrumentation, and control circuits where the steady-state current is 1.5-2.5A with occasional surges. The MRL suffix specifies IEC 60127-2 Sheet III time-lag characteristic.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
      1<\/td>Lead 1<\/td>Terminal<\/td>Fuse terminal 1 (connects to source side)<\/td><\/tr>
      2<\/td>Lead 2<\/td>Terminal<\/td>Fuse terminal 2 (connects to load side)<\/td><\/tr><\/table>","application_scenarios":"
    • Industrial control<\/li>
    • Consumer electronics<\/li>
    • Communication equipment<\/li>
    • Power management<\/li>","alternative_models":"
      Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>
      Littelfuse<\/td>0451003.MRL<\/td>5x20mm<\/td>Same device, 3A rating<\/td><\/tr>
      Bel Fuse<\/td>5ST 3-R<\/td>5x20mm<\/td>3A 250VAC slow-blow, equivalent<\/td><\/tr>
      Schurter<\/td>SPF 3.0A<\/td>5x20mm<\/td>3A 250VAC slow-blow, equivalent<\/td><\/tr>
      Bussmann<\/td>S505-3A-R<\/td>5x20mm<\/td>3A 250VAC time-lag, equivalent<\/td><\/tr>
      Eaton<\/td>BSM 3A 250V<\/td>5x20mm<\/td>3A 250VAC slow-blow, equivalent<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/5648","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/comments?post=5648"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/5648\/revisions"}],"predecessor-version":[{"id":6094,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/5648\/revisions\/6094"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/media?parent=5648"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/categories?post=5648"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/tags?post=5648"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/chip_brand?post=5648"}],"curies":[{"name":"\u062f\u0628\u0644\u064a\u0648 \u0628\u064a","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}