977 Series - 500VAC/450VDC 5x20 mm, Time Lag (Slo-Blo® ) 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.

450Vdc/500Vac rated, 5×20mm, Time-Lag, surge withstand, ceramic body, cartridge fuse.


  • Designed to International (IEC) Standards for use globally
  • Follow the IEC 60127-2, Sheet 5 specification for Time-Lag Fuses
  • Available in Cartridge and Axial lead Form
  • Rohs compliant and Pb-free


Inverter in LCD backlight unit, DC side of air-conditioners, 3-phase power supplies, Higher Energy and Power Efficient applications.

Access specifications, certifications, check availability and order parts below

Catalog #Amps (A)VDC (V)VAC (V)Nominal Melting I2T (A2sec)Resistance
Interrupting RatingMin Operating Temp (°C)Max Operating Temp (°C)BodyMarking CodeOpeningSizeStockSamplesCompare
0977.5000.54505000.30.945200A@450VDC-55125CeramicMXESlo-Blo/Time Lag (T)/Time Delay5x20mmCheckOrder
0977.8000.84505000.80.417100A@500VAC-55125CeramicMXESlo-Blo/Time Lag (T)/Time Delay5x20mmCheckOrder
0977002.2450500170.0445200A@450VDC-55125CeramicMXESlo-Blo/Time Lag (T)/Time Delay5x20mmCheckOrder
0977004.44505001240.0184200A@450VDC-55125CeramicMXESlo-Blo/Time Lag (T)/Time Delay5x20mmCheckOrder
0977005.5450500910.0119100A@500VAC-55125CeramicMXESlo-Blo/Time Lag (T)/Time Delay5x20mmCheckOrder
0977008.84505002330.008200A@450VDC-55125CeramicMXESlo-Blo/Time Lag (T)/Time Delay5x20mmCheckOrder
0977010.104505002490.0072200A@450VDC-55125CeramicMXESlo-Blo/Time Lag (T)/Time Delay5x20mmCheckOrder
0977012.124505003880.0058200A@450VDC-55125CeramicMXESlo-Blo/Time Lag (T)/Time Delay5x20mmCheckOrder
0977016.164505007250.0039200A@450VDC-55125CeramicMXESlo-Blo/Time Lag (T)/Time Delay5x20mmCheckOrder
097706.36.34505001880.0091200A@450VDC-55125CeramicMXESlo-Blo/Time Lag (T)/Time Delay5x20mmCheckOrder
09773.153.15450500580.0275200A@450VDC-55125CeramicMXESlo-Blo/Time Lag (T)/Time Delay5x20mmCheckOrder

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450Vdc/500Vac rated, 5x20mm, Time-Lag, surge withstand, ceramic body, cartridge fuse...

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