ATO Smart Glow Series - Aftermarket - 257 Series - ATO® Fast-Acting Automotive Blade Fuse Smart Glow

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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.

Each ATO® Smart Glow fuse includes an indicator light that comes on when the fuse blows. These innovative 32 V blade fuses perform similarly to ATO 287 Series, ATOF®, and ATO Silver fuses. The newer fuses replace obsolete ATO Series 257 fuses.


  • Fast-acting
  • Available with ampere ratings of 3 A to 30 A
  • Interrupting ratings of 1 kA at 32 V dc
  • Operate at up to 130 ℃
  • Tin-plated zinc alloy terminals
  • PA66 housings with UL flammability ratings of V-2
  • Net weight 1.4 g ±5 % per fuse
  • Comply with SAE J2077
  • UL Listed
  • Certified lead-free and RoHS compliant


  • Color-coding indicates ampere rating
  • High-contrast ampere rating stamp aids identification
  • See-through housing makes it easier to see when fuse blows
  • Depending on use, ATO Smart Glow fuses can replace fuses of the same ratings from the ATO® 287, ATOF®, and ATO Silver series


  • Cars and SUVs
  • Trucks
  • Buses
  • Offroad vehicles
  • Watercraft as approved by Littelfuse
Part # Part Description RoHS Pb-free RoHS (2015/ 863/EU) Certificate REACH (SVHC’s) Declaration Halogen Free REACH (SVHC’s) IPC-Material Declaration
0ATO020.MXGLO Fuse - ATO SmartGlow 32VDC 20A 1000 pc RoHS No 07/30/2012 PbFree No 07/30/2012 REACH191_Declaration_0ATO020.MXGLO
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