437 Series - 1206 Size Lead-Free, Halogen Free, High Temperature Very Fast-Acting Ceramic Fuse

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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.

This 100% Lead-free, RoHS compliant and Halogen-free fuse series has been designed specifically to provide over current protection to circuits that see high working ambient temperatures (up to 150ºC).
The general design ensures excellent temperature stability and performance reliability.
In addition to this, the high I²t values typical of the Littelfuse Ceramic Fuse family ensure high inrush current withstand capability.

  • Operating Temperature from -55ºC to +150ºC
  • 100% Lead-free, HalogenFree and RoHS compliant
  • Suitable for both leaded and lead-free reflow / wave soldering


  • LCD Displays
  • Servers
  • Printers
  • Scanners
  • Data Modems

Access specifications, certifications, check availability and order parts below

Catalog #VDC (V)VAC (V)Nominal Melting I2T (A2sec)Resistance
BodyMin Operating Temp (°C)Max Operating Temp (°C)MSLOpeningStockSamplesCompare
0437.2501251250.0032.29Ceramic Body-55150IPC/JEDEC J-STD-020C LEVEL 1Fast-Acting (F)CheckOrder
0437.3751251250.011.33Ceramic Body-55150IPC/JEDEC J-STD-020C LEVEL 1Fast-Acting (F)CheckOrder
0437.50063630.0180.908Ceramic Body-55150IPC/JEDEC J-STD-020C LEVEL 1Fast-Acting (F)CheckOrder
0437.75063630.0640.665Ceramic Body-55150IPC/JEDEC J-STD-020C LEVEL 1Fast-Acting (F)CheckOrder
043700163630.10.36Ceramic Body-55150IPC/JEDEC J-STD-020C LEVEL 1Fast-Acting (F)CheckOrder
043700263630.28420.062Ceramic Body-55150IPC/JEDEC J-STD-020C LEVEL 1Fast-Acting (F)CheckOrder
043700332320.40.033Ceramic Body-55150IPC/JEDEC J-STD-020C LEVEL 1Fast-Acting (F)CheckOrder
043700432321.0240.022Ceramic Body-55150IPC/JEDEC J-STD-020C LEVEL 1Fast-Acting (F)CheckOrder
043700532321.9360.016Ceramic Body-55150IPC/JEDEC J-STD-020C LEVEL 1Fast-Acting (F)CheckOrder
043700732324.90.01Ceramic Body-55150IPC/JEDEC J-STD-020C LEVEL 1Fast-Acting (F)CheckOrder
043700832326.40.0087Ceramic Body-55150IPC/JEDEC J-STD-020C LEVEL 1Fast-Acting (F)CheckOrder
043701.563630.1580.209Ceramic Body-55150IPC/JEDEC J-STD-020C LEVEL 1Fast-Acting (F)CheckOrder
043702.532320.38860.043Ceramic Body-55150IPC/JEDEC J-STD-020C LEVEL 1Fast-Acting (F)CheckOrder
043703.532320.5760.027Ceramic Body-55150IPC/JEDEC J-STD-020C LEVEL 1Fast-Acting (F)CheckOrder
04371.2563630.11170.318Ceramic Body-55150IPC/JEDEC J-STD-020C LEVEL 1Fast-Acting (F)CheckOrder
04371.7563630.24690.071Ceramic Body-55150IPC/JEDEC J-STD-020C LEVEL 1Fast-Acting (F)CheckOrder
Part # Part Description RoHS Pb-free RoHS (2015/ 863/EU) Certificate REACH (SVHC’s) Declaration Halogen Free REACH (SVHC’s)
0437.250WR FUSE 125V FA 1206 .250A RoHS No 06/06/2008 PbFree No CoC_RoHS10_0437.250WR_10-07-2019 REACH201_Declaration_0437.250WR_10-07-2019 Yes
Does not Contain
0437.375WR FUSE 125V FA 1206 .375A RoHS No 06/06/2008 PbFree No CoC_RoHS10_0437.375WR_09-19-2019 REACH201_Declaration_0437.375WR_09-19-2019 Yes
Does not Contain
0437.500WR FUSE 63V FA 1206 .500A RoHS No 06/06/2008 PbFree No CoC_RoHS10_0437.500WR_08-01-2017 REACH205_Declaration_0437.500WR_05-08-2020 Yes
Does not Contain
0437.750WR FUSE 63V FA 1206 .750A RoHS No 06/06/2008 PbFree No CoC_RoHS10_0437.750WR_10-07-2019 REACH211_Declaration_0437.750WR_01-28-2021 Yes
Does not Contain
0437001.WR FUSE 63V FA 1206 1A RoHS No 06/06/2008 PbFree No CoC_RoHS10_0437001.WR_08-01-2017 REACH219_Declaration_0437001.WR_7-27-2021 Yes
Does not Contain
0437002.WR FUSE 63V FA 1206 2A RoHS No 06/06/2008 PbFree No CoC_RoHS10_0437002.WR_10-02-2019 REACH209_Declaration_0437002.WR_09-02-2020 Yes
Does not Contain
0437003.WR FUSE 32V FA 1206 3A RoHS No 06/06/2008 PbFree No CoC_RoHS10_0437003.WR_05-07-2018 REACH219_Declaration_0437003.WR_07-27-2021 Yes
Does not Contain
0437004.WR FUSE 32V FA 1206 4A RoHS No 06/06/2008 PbFree No CoC_RoHS10_0437004.WR_10-8-2019 REACH201_Declaration_0437004.WR_10-22-2019 Yes
Does not Contain
0437005.WR FUSE 32V FA 1206 5A RoHS No 06/06/2008 PbFree No CoC_RoHS10_0437005.WR_10-17-2019 REACH211_Declaration_0437005.WR_01-20-2021 Yes
Does not Contain
0437007.WR FUSE 32V FA 1206 7A RoHS No 06/06/2008 PbFree No CoC_RoHS10_0437007.WR_08-11-2017 REACH209_Declaration_0437007.WR_12-03-2020 Yes
Does not Contain
0437008.WR FUSE 32V FA 1206 8A RoHS No 06/06/2008 PbFree No CoC_RoHS10_0437008.WR_10-8-2019 REACH219_Declaration_0437008.WR_08-03-2021 Yes
Does not Contain
043701.5WR FUSE 63V FA 1206 1.5A RoHS No 06/06/2008 PbFree No CoC_RoHS10_043701.5WR_08-13-2017 REACH201_Declaration_043701.5WR_09-09-2019 Yes
Does not Contain
043702.5WR FUSE 32V FA 1206 2.5A RoHS No 06/06/2008 PbFree No CoC_RoHS10_043702.5WR_08-01-2017 REACH201_Declaration_043702.5WR_09-09-2019 Yes
Does not Contain
043703.5WR FUSE 32V FA 1206 3.5A RoHS No 06/06/2008 PbFree No CoC_REACh181_043703.5WR_02-28-2018 REACH191_Declaration_043703.5WR_11-08-2018 Yes
Does not Contain
04371.25WR FUSE 63V FA 1206 1.25A RoHS No 06/06/2008 PbFree No CoC_RoHS10_04371.25WR_08-24-2017 REACH191_Declaration_04371.25WR_11-20-2018 Yes
Does not Contain
04371.75WR FUSE 63V FA 1206 1.75A RoHS No 06/06/2008 PbFree No 06/06/2008 CoC_RoHS10_04371.75WR_10-23-2017 REACH197_Declaration_04371.75WR_02-14-2019 Yes
Does not Contain
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