328 Series - Lead Free 3AB, High Surge Withstanding 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.

The 328 Series is a 300VAC rated, 10kA surge withstand, 6.3×32mm ceramic fuse, designed in accordance to UL248-14 Standard, provided in cartridge and axial-lead packages.


  • High surge withstand capability
    – 20 hits of 10kA 8/20μs surge
    – Meets ANSI/IEEE C62.41.2, Category C-High
    – Meets US Dept of Energy (DOE) MSSLC/ CBEA street lighting and parking lot lighting, elevated level
  • Small form factor (6.3×32mm) with cartridge and axial-lead package options
  • Breaking capacity: 200A@300VAC, 200A@100VDC
  • Lead-free, RoHS compliant, halogen-free
  • Compliant with UL248- 14 and NFPA 70 (NEC) primary fusing requirements
  • Operating temperature: –55°C to 125°C


  • Commercial and outdoor LED luminaries
  • Outdoor electronics and electrical equipment
  • Surge protection for telecom application

Access specifications, certifications, check availability and order parts below

Catalog #VAC (V)Nominal Melting I2T (A2sec)Resistance
BodyMSLOpeningVDC (V)Min Operating TemperatureOperating Temperature Maximum CelsiusPartner ECAD ModelsStockSamples
32802130048000.0042CeramicContact LittelfuseSlo-Blo/Time Lag (T)/Time Delay100-55125328021CheckOrder
Catalog # Certificates
Sorting icon
328021 uriconcRUiconTUVicon
Part # Part Description RoHS Pb-free RoHS (2015/ 863/EU) Certificate REACH (SVHC’s) Declaration Halogen Free REACH (SVHC’s) IPC-Material Declaration
0328021.MXP FUSE 300V HIGH I2T 3AB PB-FREE 21A RoHS No 02/26/2019 PbFree No 02/26/2019 Yes
0328021.MXEP FUSE 300V HIGH I2T 3AB PB-FREE 21A RoHS No 02/26/2019 PbFree No 02/26/2019 CoC_RoHS10_0328021.MXEP REACH209_Declaration_0328021.MXEP Yes
Does not Contain IPC_0328021.MXEP
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