278 Series - MICRO™ Very Fast-Acting Subminiature Radial Leaded Fuse

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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.

Developed originally for the U.S. Space Program, MICRO™ fuse provides reliability in a compact design. The MICRO™ fuse is available in plug–in or radial lead styles and a complete range of ampere ratings from 0.002A to 5A to suit a wide variety of design needs.


  • Military grade available
  • High breaking capacity
  • Clear cover option to view fuse element status
  • Available from very low ampere of 0.002A to 5A
  • Plug-in with short or long leads option


  • Printed circuit boards and similar equipment
  • Electronic components

Access specifications, certifications, check availability and order parts below

Catalog #VDC (V)VAC (V)Resistance
Nominal Melting I2T (A2sec)Min Operating Temp (°C)Max Operating Temp (°C)OpeningPartner ECAD ModelsStockSamplesCompare
0278.00212512522008.45E-09-55125Very Fast-Acting (FF)278_002CheckOrder
0278.0051251252807.66E-08-55125Very Fast-Acting (FF)278_005CheckOrder
0278.010125125800.000000462-55125Very Fast-Acting (FF)278_01CheckOrder
0278.015125125440.00000123-55125Very Fast-Acting (FF)278_015CheckOrder
0278.031125125160.0000081-55125Very Fast-Acting (FF)278_031CheckOrder
0278.0501251253.520.0000666-55125Very Fast-Acting (FF)278_05CheckOrder
0278.0621251252.550.000115-55125Very Fast-Acting (FF)278_062CheckOrder
0278.1001251251.380.000385-55125Very Fast-Acting (FF)278_1CheckOrder
0278.12512512510.000691-55125Very Fast-Acting (FF)278_125CheckOrder
0278.2001251252.30.00409-55125Very Fast-Acting (FF)278_2CheckOrder
0278.2501251251.750.0064-55125Very Fast-Acting (FF)278_25CheckOrder
0278.3001251251.250.00945-55125Very Fast-Acting (FF)278_3CheckOrder
0278.4001251250.2270.0251-55125Very Fast-Acting (FF)278_4CheckOrder
0278.5001251250.1670.0716-55125Very Fast-Acting (FF)278_5CheckOrder
0278.6001251250.430.0411-55125Very Fast-Acting (FF)278_6CheckOrder
0278.7001251250.3240.071-55125Very Fast-Acting (FF)278_7CheckOrder
0278.7501251250.2930.0563-55125Very Fast-Acting (FF)278_75CheckOrder
0278.8001251250.2710.113-55125Very Fast-Acting (FF)278_8CheckOrder
0278001.1251250.0880.0648-55125Very Fast-Acting (FF)278001CheckOrder
0278002.1251250.04250.3-55125Very Fast-Acting (FF)278002CheckOrder
0278003.1251250.02750.759-55125Very Fast-Acting (FF)278003CheckOrder
0278004.1251250.02021.38-55125Very Fast-Acting (FF)278004CheckOrder
0278005.1251250.01562.21-55125Very Fast-Acting (FF)278005CheckOrder
027801.51251250.05780.16-55125Very Fast-Acting (FF)27801_5CheckOrder
Part # Part Description RoHS Pb-free RoHS (2015/ 863/EU) Certificate REACH (SVHC’s) Declaration Halogen Free REACH (SVHC’s)
0278.050V FUSE 125V V/FA MICRO FUSE RAD .050A RoHS No 02/27/2002 PbFree No 02/27/2002 CoC_RoHS10_0278.050V_11-16-2018 REACH191_Declaration_0278.050V_11-16-2018 No
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