504 Series - 420VDC/500VAC 6x32mm Ceramic Body 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.

A 420VDC and 500VAC rated ceramic fuse with remarkable interrupting rating in a compact 6.3 x 32mm package, which is well suited for circuit protection in high energy applications.


  • In accordance with Underwriters Laboratories Standard UL 248-14
  • Available in cartridge and axial lead form and with various lead forming dimensions
  • RoHS compliant and Lead-free
  • Compact form factor of 6.3mm x 32mm


  • High Voltage AC/DC power application

Access specifications, certifications, check availability and order parts below

Catalog #Amps (A)VAC (V)Nominal Melting I2T (A2sec)Resistance
Interrupting RatingBodyMarking CodeMin Operating Temp (°C)Max Operating Temp (°C)SizeVDC (V)StockSamplesCompare
504020205007600.00581500A@250VACCeramic BodyMX-551253AB/3AG (6.3x32mm)420CheckOrder
5040252550015000.003951500A@250VACCeramic BodyMX-551253AB/3AG (6.3x32mm)420CheckOrder
5040303050026000.00311500A@250VACCeramic BodyMX-551253AB/3AG (6.3x32mm)420CheckOrder
Catalog # Certificates
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504025 curus
504030 curus

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