451 Series - NANO2® Fast-Acting Subminiature Surface Mount Fuse

Series: 451
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Disclaimer Notice

Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

The Nano2® SMF Fuse is a very small, Wire-in-Air (WIA) square shape surface mount fuse which is very suitable for the secondary side circuit over-current protection applications and is designed for PCB using surface mount technology.

Features:

  • Very fast acting
  • Small size
  • Wide range of current rating available (0.062A to 20A)
  • Wide operating temperature range
  • Low temperature rerating
  • RoHS compliant and Halogen Free

Applications:

  • Notebook PC
  • LCD/PDP TV
  • LCD monitor
  • LCD/PDP panel
  • LCD backlight inverter
  • Portable DVD player
  • Power supply
  • Networking
  • PC server
  • Cooling fan system
  • Storage system
  • Telecom system
  • Wireless basestation
  • White goods
  • Game console
  • Office Automation equipment
  • Battery charging circuit protection
  • Industrial equipment




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Access specifications, certifications, check availability and order parts below

Catalog #VDC (V)VAC (V)Nominal Melting I2T (A2sec)Resistance
(Ω)		BodyMin Operating Temp (°C)Max Operating Temp (°C)MSLOpeningPartner ECAD ModelsStockSamplesCompare
045102065651540.00244Ceramic-551251Very Fast-Acting (FF)0451020CheckOrder
0451.0621251250.000195.5Ceramic-551251Very Fast-Acting (FF)451_062CheckOrder
0451.0801251250.000334.05Ceramic-551251Very Fast-Acting (FF)451_08CheckOrder
0451.1001251250.001383.1Ceramic-551251Very Fast-Acting (FF)451_1CheckOrder
0451.1251251250.002861.7Ceramic-551251Very Fast-Acting (FF)451_125CheckOrder
0451.1601251250.00481.2157Ceramic-551251Very Fast-Acting (FF)451_16CheckOrder
0451.2001251250.00890.8372Ceramic-551251Very Fast-Acting (FF)451_2CheckOrder
0451.2501251250.01580.5765Ceramic-551251Very Fast-Acting (FF)451_25CheckOrder
0451.3151251250.03110.3918Ceramic-551251Very Fast-Acting (FF)451_315CheckOrder
0451.3751251250.04420.4541Ceramic-551251Very Fast-Acting (FF)0451.375CheckOrder
0451.4001251250.05510.4233Ceramic-551251Very Fast-Acting (FF)451_4CheckOrder
0451.5001251250.08240.3046Ceramic-551251Very Fast-Acting (FF)451_5CheckOrder
0451.6301251250.13810.2022Ceramic-551251Very Fast-Acting (FF)451_63CheckOrder
0451.7501251250.21430.1444Ceramic-551251Very Fast-Acting (FF)451_75CheckOrder
0451.8001251250.26540.1355Ceramic-551251Very Fast-Acting (FF)451_8CheckOrder
0451001.1251250.60290.078Ceramic-551251Very Fast-Acting (FF)451001CheckOrder
0451002.1251250.530.0367Ceramic-551251Very Fast-Acting (FF)451002CheckOrder
0451003.1251251.650.0227Ceramic-551251Very Fast-Acting (FF)451003CheckOrder
0451004.1251253.1520.016Ceramic-551251Very Fast-Acting (FF)451004CheckOrder
0451005.1251255.5660.0125Ceramic-551251Very Fast-Acting (FF)451005CheckOrder
0451007.12512510.320.009Ceramic-551251Very Fast-Acting (FF)451007CheckOrder
0451008.12512520.230.0077Ceramic-551251Very Fast-Acting (FF)451008CheckOrder
045101.51251250.8530.063Ceramic-551251Very Fast-Acting (FF)45101_5CheckOrder
045101.61251251.060.058Ceramic-551251Very Fast-Acting (FF)45101_6CheckOrder
0451010.12512526.460.0056Ceramic-551251Very Fast-Acting (FF)451010CheckOrder
0451012.656547.970.0049Ceramic-551251Very Fast-Acting (FF)451012CheckOrder
0451015.656597.820.0037Ceramic-551251Very Fast-Acting (FF)451015CheckOrder
045102.51251251.0290.0286Ceramic-551251Very Fast-Acting (FF)45102_5CheckOrder
045103.51251252.4690.02Ceramic-551251Very Fast-Acting (FF)45103_5CheckOrder
045106.31251259.170.0096Ceramic-551251Very Fast-Acting (FF)45106_3CheckOrder
04511.251251250.6640.078Ceramic-551251Very Fast-Acting (FF)4511_25CheckOrder
04513.151251251.920.0215Ceramic-551251Very Fast-Acting (FF)4513_15CheckOrder
Catalog # Certificates
Sorting icon
0451.062 culuscsa
0451.080 culuscsa
0451.100 culuscsa
0451.125 culuscsa
0451.160 culuscsa
0451.200 culuscsa
0451.250 culuscsa
0451.315 culuscsa
0451.375 culuscsa
0451.400 culuscsa
0451.500 culuscsa
0451.630 culuscsa
0451.750 culuscsa
0451.800 culuscsa
0451001. culuscsaMETITUV_50119118icon
0451002. culuscsaMETITUV_50119118icon
0451003. culuscsaMETITUV_50119118icon
0451004. culuscsaMETITUV_50119118icon
0451005. culuscsaMETITUV_50119118icon
0451007. curuscsaMETITUV_50119118icon
0451008. curuscsaMETITUV_50119118icon
045101.5 culuscsaMETITUV_50119118icon
045101.6 culuscsaMETITUV_50119118icon
0451010. curuscsaMETITUV_50119118icon
0451012. curuscsaMETITUV_50119118icon
0451015. curuscsaMETITUV_50119118icon
045102.5 culuscsaMETITUV_50119118icon
045103.5 culuscsaMETITUV_50119118icon
045106.3 curuscsaMETITUV_50119118icon
04511.25 culuscsaMETITUV_50119118icon
04513.15 culuscsaMETITUV_50119118icon
Part # Part Description RoHS Pb-free RoHS (2015/ 863/EU) Certificate REACH (SVHC’s) Declaration Halogen Free REACH (SVHC’s)
0451020.MRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS 20A RoHS No 01/12/2004 PbFree No 02/23/2016 CoC_RoHS9_0451020.MRL_05-30-2019 REACH211_Declaration_-Contain-_0451020.MRL_03-31-2021 Yes
02/23/2016		 Contains
0451020.MRSN FUSE 125V V/FA NANO2 Sn-Dip RoHS 20A RoHS No 01/12/2004 PbFree No 02/23/2016 CoC_RoHS9_0451020.MRSN_09-06-2019 REACH201_Declaration_with_Pb_0451020.MRSN_09-06-2019 Yes
02/23/2016		 Contains
0451.062MR FUSE 125V V/FA NANO2 W/Ag CAPS .062A RoHS No 01/12/2004 PbFree No CoC_RoHS9_0451.062MR_09-14-2017 Yes
0451.062NR FUSE 125V V/FA NANO2 W/Ag CAPS .062A RoHS No 01/12/2004 PbFree No Yes
0451.062MRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS.062A RoHS No 01/12/2004 PbFree No CoC_RoHS9_0451.062MRL_06-04-2019 REACH219_Declaration_(Contain)_0451.062MRL_08-18-2021 Yes
Contains
0451.080MR FUSE 125V V/FA NANO2 W/Ag CAPS .080A RoHS No 01/12/2004 PbFree No Yes
0451.080NRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS.080A RoHS No 01/12/2004 PbFree No CoC_RoHS9_0451.080NRL_04-09-2019 REACH197_Declaration_with_Pb_0451.080NRL_04-09-2019 Yes
Contains
0451.080MRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS.080A RoHS No 01/12/2004 PbFree No CoC_RoHS9_0451.080MRL_10-16-2019 REACH219_Declaration_(Contain)_0451.080MRL_08-18-2021 Yes
Contains
0451.100MR FUSE 125V V/FA NANO2 W/Ag CAPS .100A RoHS No 01/12/2004 PbFree No Yes
0451.100NRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS.100A RoHS No 01/12/2004 PbFree No Yes
0451.100MRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS.100A RoHS No 01/12/2004 PbFree No CoC_RoHS9_0451.100MRL_06-06-2019 REACH211_Declaration_-Contain-_0451.100MRL_02-25-2021 Yes
Contains
0451.160MRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS.160A RoHS No 01/12/2004 PbFree No CoC_RoHS9_0451.160MRL_06-04-2019 REACH219_Declaration_(Contain)_0451.160MRL_09-16-2021 Yes
Contains
0451.160NRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS.160A RoHS No 01/12/2004 PbFree No Yes
0451.200MRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS.200A RoHS No 01/12/2004 PbFree No CoC_RoHS9_0451.200MRL_10-08-2019 REACH211_Declaration_-Contain-_0451.200MRL_03-29-2021 Yes
Contains
0451.200NRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS.200A RoHS No 01/12/2004 PbFree No CoC_RoHS9_0451.200NRL_03-29-2021 REACH211_Declaration_-Contain-_0451.200NRL_03-29-2021 Yes
Contains
0451.250MRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS.250A RoHS No 01/12/2004 PbFree No CoC_RoHS9_0451.250MRL_04-08-2019 REACH219_Declaration_(Contain)_0451.250MRL_08-18-2021 Yes
Contains
0451.250NRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS.250A RoHS No 01/12/2004 PbFree No CoC_RoHS9_0451.250NRL_10-23-2017 REACH209_Declaration_-Contain-_0451.250NRL_09-22-2020 Yes
Contains
0451.315MRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS.315A RoHS No 01/12/2004 PbFree No CoC_RoHS9_0451.315MRL_06-07-2019 REACH205_Declaration_-Contain-_0451.315MRL_05-19-2020 Yes
Contains
0451.315NRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS.315A RoHS No 01/12/2004 PbFree No CoC_RoHS9_0451.315NRL_01-09-2018 REACH191_Declaration_with_Pb_0451.315NRL_11-22-2018 Yes
Contains
04513.15MR FUSE 125V V/FA NANO2 W/SnPb CAPS 3.15A RoHS No 01/12/2004 PbFree No Yes
04513.15MRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS3.15A RoHS No 01/12/2004 PbFree No CoC_RoHS9_04513.15MRL_06-06-2019 REACH211_Declaration_(Contain)_04513.15MRL_05-31-2021 Yes
Contains
04513.15NRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS3.15A RoHS No 01/12/2004 PbFree No Yes
0451.375MR FUSE 125V V/FA NANO2 W/SnPb CAPS .375A RoHS No 01/12/2004 PbFree No Yes
0451.375NR FUSE 125V V/FA NANO2 W/SnPb CAPS .375A RoHS No 01/12/2004 PbFree No Yes
0451.375MRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS.375A RoHS No 01/12/2004 PbFree No CoC_RoHS9_0451.375MRL_03-19-2020 REACH211_Declaration_(Contain)_0451.375MRL_05-24-2021 Yes
Contains
0451.375NRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS.375A RoHS No 01/12/2004 PbFree No CoC_RoHS9_0451.375NRL_11-13-2018 REACH191_Declaration_with_Pb_0451.375NRL_11-13-2018 Yes
Contains
0451.400MR FUSE 125V V/FA NANO2 W/SnPb CAPS .400A RoHS No 01/12/2004 PbFree No Yes
0451.400NRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS.400A RoHS No 01/12/2004 PbFree No Yes
0451.400MRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS.400A RoHS No 01/12/2004 PbFree No CoC_RoHS9_0451.400MRL_12-14-2020 REACH219_Declaration_(Contain)_0451.400MRL_09-16-2021 Yes
Contains
0451.500MR FUSE 125V V/FA NANO2 W/SnPb CAPS .500A RoHS No 01/12/2004 PbFree No CoC_REACh174_0451.500MR_09-22-2017 Yes
01/12/2004
0451.500NR FUSE 125V V/FA NANO2 W/SnPb CAPS .500A RoHS No 01/12/2004 PbFree No Yes
01/12/2004
0451.500MRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS.500A RoHS No 01/12/2004 PbFree No CoC_RoHS9_0451.500MRL_06-04-2019 REACH219_Declaration_(Contain)_0451.500MRL_08-26-2021 Yes
01/12/2004		 Contains
0451.500NRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS.500A RoHS No 01/12/2004 PbFree No CoC_RoHS9_0451.500NRL_09-13-2021 REACH191_Declaration_with_Pb_0451.500NRL_11-20-2018 Yes
01/12/2004		 Contains
0451.630MR FUSE 125V V/FA NANO2 W/SnPb CAPS .630A RoHS No 01/12/2004 PbFree No Yes
0451.630NRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS.630A RoHS No 01/12/2004 PbFree No CoC_RoHS9_0451.630NRL_3-5-2020 REACH205_Declaration_-Contain-_0451.630NRL_3-5-2019 Yes
Contains
0451.630MRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS.630A RoHS No 01/12/2004 PbFree No CoC_RoHS9_0451.630MRL_06-04-2019 REACH205_Declaration_-Contain-_0451.630MRL_3-5-2020 Yes
Contains
0451.750MR FUSE 125V V/FA NANO2 W/SnPb CAPS .750A RoHS No 01/12/2004 PbFree No Yes
0451.750NR FUSE 125V V/FA NANO2 W/SnPb CAPS .750A RoHS No 01/12/2004 PbFree No Yes
0451.750MRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS.750A RoHS No 01/12/2004 PbFree No CoC_RoHS9_0451.750MRL_10-09-2019 REACH201_Declaration_with_Pb_0451.750MRL_10-09-2019 Yes
Contains
0451.750NRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS.750A RoHS No 01/12/2004 PbFree No Yes
0451.800MR FUSE 125V V/FA NANO2 W/SnPb CAPS .800A RoHS No 01/12/2004 PbFree No Yes
0451.800NRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS.800A RoHS No 01/12/2004 PbFree No Yes
0451.800MRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS.800A RoHS No 01/12/2004 PbFree No CoC_RoHS9_0451.800MRL_06-06-2017 REACH197_Declaration_with_Pb_0451.800MRL_04-26-2019 Yes
Contains
0451004.MR FUSE 125V V/FA NANO2 W/SnPb CAPS 4A RoHS No 01/12/2004 PbFree No Yes
0451004.NR FUSE 125V V/FA NANO2 W/SnPb CAPS 4A RoHS No 01/12/2004 PbFree No Yes
0451004.MRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS 4A RoHS No 01/12/2004 PbFree No CoC_RoHS9_0451004.MRL_7-31-2019 REACH211_Declaration_-Contain-_0451004.MRL_03-05-2021 Yes
Contains
0451004.NRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS 4A RoHS No 01/12/2004 PbFree No CoC_RoHS9_0451004.NRL_7-31-2019 REACH191_Declaration_with_Pb_0451004.NRL_11-05-2018 Yes
Contains
0451008.MR FUSE 125V V/FA NANO2 W/SnPb CAPS 8A RoHS No 01/12/2004 PbFree No Yes
0451008.NRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS 8A RoHS No 01/12/2004 PbFree No CoC_REACh181_0451008.NRL_01-25-2018 REACH197_Declaration_with_Pb_0451008.NRL_02-11-2019 Yes
Contains
0451008.MRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS 8A RoHS No 01/12/2004 PbFree No CoC_RoHS9_0451008.MRL_07-16-2019 REACH211_Declaration_-Contain-_0451008.MRL_3-4-2021 Yes
Contains
0451015.MR FUSE 65V V/FA NANO2 W/SnPb CAPS 15A RoHS No 01/12/2004 PbFree No Yes
0451015.MRL FUSE 65V V/FA NANO2 W/Au CAPS RoHS 15A RoHS No 01/12/2004 PbFree No CoC_RoHS9_0451015.MRL_06-08-2021 REACH219_Declaration_(Contain)_0451015.MRL_09-20-2021 Yes
Contains
0451015.NR FUSE 65V V/FA NANO2 W/SnPb CAPS 15A RoHS No 01/12/2004 PbFree No Yes
0451015.NRL FUSE 65V V/FA NANO2 W/Au CAPS RoHS 15A RoHS No 01/12/2004 PbFree No Yes
045101.5MR FUSE 125V V/FA NANO2 W/SnPb CAPS 1.5A RoHS No 01/12/2004 PbFree No Yes
045101.5NR FUSE 125V V/FA NANO2 W/SnPb CAPS 1.5A RoHS No 01/12/2004 PbFree No Yes
045101.5MRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS 1.5A RoHS No 01/12/2004 PbFree No CoC_RoHS9_045101.5MRL_06-06-2019 REACH219_Declaration_(Contain)_045101.5MRL_08-25-2021 Yes
Contains
045101.5NRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS 1.5A RoHS No 01/12/2004 PbFree No CoC_RoHS9_045101.5NRL_07-15-2020 REACH209_Declaration_-Contain-_045101.5NRL_07-15-2020 Yes
Contains
0451010.MR FUSE 125V V/FA NANO2 W/SnPb CAPS 10A RoHS No 01/12/2004 PbFree No REACH191_Declaration_with_Pb_0451010.MR_11-13-2018 Yes
Contains
0451010.NR FUSE 125V V/FA NANO2 W/SnPb CAPS 10A RoHS No 01/12/2004 PbFree No Yes
0451010.MRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS 10A RoHS No 01/12/2004 PbFree No CoC_RoHS9_0451010.MRL_04-08-2019 REACH219_Declaration_(Contain)_0451010.MRL_08-09-2021 Yes
Contains
0451010.NRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS 10A RoHS No 01/12/2004 PbFree No CoC_RoHS9_0451010.NRL_03-15-2019 REACH197_Declaration_with_Pb_0451010.NRL_03-15-2019 Yes
Contains
045106.3MR FUSE 125V V/FA NANO2 W/SnPb CAPS 6.3A RoHS No 01/12/2004 PbFree No Yes
045106.3NRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS 6.3A RoHS No 01/12/2004 PbFree No CoC_RoHS9_045106.3NRL_06-14-2017 REACH201_Declaration_with_Pb_045106.3NRL_12-18-2019 Yes
Contains
045106.3MRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS 6.3A RoHS No 01/12/2004 PbFree No CoC_RoHS9_045106.3MRL_10-08-2019 REACH211_Declaration_-Contain-_045106.3MRL_04-06-2021 Yes
Contains
04511.25MR FUSE 125V V/FA NANO2 W/SnPb CAPS 1.25A RoHS No 01/12/2004 PbFree No Yes
04511.25NRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS1.25A RoHS No 01/12/2004 PbFree No CoC_RoHS9_04511.25NRL_10-13-2017 REACH191_Declaration_with_Pb_04511.25NRL_09-21-2018 Yes
Contains
0451.125MRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS.125A RoHS No 01/12/2004 PbFree No CoC_RoHS9_0451.125MRL_10-09-2019 REACH201_Declaration_with_Pb_0451.125MRL_10-09-2019 Yes
Contains
0451.125NR FUSE 125V V/FA NANO2 W/Ag CAPS .125A RoHS No 01/12/2004 PbFree No Yes
0451.125NRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS.125A RoHS No 01/12/2004 PbFree No CoC_RoHS9_0451.125NRL_06-15-2017 Yes
0451.125MR FUSE 125V V/FA NANO2 W/Ag CAPS .125A RoHS No 01/12/2004 PbFree No Yes
04511.25MRL FUSE 125V V/FA NANO2 W/Au CAPS RoHS1.25A RoHS No 01/12/2004 PbFree No CoC_RoHS9_04511.25MRL_06-06-2019 REACH219_Declaration_(Contain)_04511.25MRL_09-20-2021 Yes
Contains
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EC611 Circuit Protection for Lithium Ion and Lithium Polymer Rechargeable Battery Applications

This application note summarizes how the increased use of Lithium-Ion and Lithium Polymer battery packs in applications where user safety is critical, the implementation of secondary protection circuits will ensure an unsurpassed level of safety with minimal cost impact.
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