Littelfuse Supplier Page

977 Series 5 x 20 mm-size
500 VAC / 450 VDC Fuses


Littelfuse introduces 977 series fuses


The Littelfuse 977 series of ceramic body, 5 x 20 mm-size fuses is designed for circuit protection in both high-power AC and power-efficient DC applications. It can safely interrupt fault currents up to 100 A at 500 VAC or 200 A at 450 VDC.

Designers may use 977 Series fuses in power supply lines both before and after the PFC (power factor correction) capacitor banks. On the DC side, they are ideal for individual component and secondary circuit protection.

Applications include 3-phase power supplies, uninterruptible power supplies, and motor control circuits.
Littelfuse 977 series

Features Applications
  • DC interrupting current
  • 100% Lead-Free and RoHS compliant
  • 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
  • Input of 3-phase power supply
  • Inverter in LCD backlight unit
  • DC side of air-conditioners
  • Higher energy and power efficient applications

  • 977 Series Datasheet

Cartridge Type
Digi-Key P/N Manufacturer P/N Description
F1665-ND 0977.500MXP FUSE 500VAC 450VDC 5X20 TL .500A
F1666-ND 0977.800MXP FUSE 500VAC 450VDC 5X20 TL .800A
F1667-ND 0977002.MXP FUSE 500VAC 450VDC 5X20 TL 2A
F1668-ND 09773.15MXP FUSE 500VAC 450VDC 5X20 TL 3.15A
F1669-ND 0977004.MXP FUSE 500VAC 450VDC 5X20 TL 4A
View more 977 series cartridge type
Axial Lead
F1676-ND 0977.500MXEP FUSE 500VAC 450VDC 5X20 TL .500A
F1677-ND 0977.800MXEP FUSE 500VAC 450VDC 5X20 TL .800A
F1678-ND 0977002.MXEP FUSE 500VAC 450VDC 5X20 TL PT 2A
F1679-ND 09773.15MXEP FUSE 500VAC 450VDC 5X20 TL 3.15A
F1680-ND 0977004.MXEP FUSE 500VAC 450VDC 5X20 TL PT 4A
View more 977 series axial lead