Littelfuse – Resettable Fuses

Littelfuse POLY-FUSE devices are Polymeric Positive Temperature Coefficient (PPTC) devices which offer a resettable overcurrent protection alternative. Wherever a replacement of the protection components in case of need is not possible, the use of resettable fuses is indispensable. Another key role plays miniaturization. The available space on a circuit board is limited for which reason the protection device has to meet this requirement as well.

Features and benefits:

  • Reduced repair and replacement costs
  • Increased reliability
  • Combined overcurrent and overtemperature protector in one device

Surface Mount Devices: LoRho, 0402L, 0603L, 0805L, 1210L, 1812L, 2016L 2920L, 250S

  • A full range of compact footprints
  • Low hold current
  • Very fast trip time
  • Low resistance

Radial Leaded Series: USBR, 16R, 30R, 60R, 72R, 250R, 600R

  • Protection devices up to 600Vdc
  • A very high hold current
  • Low trip-to-hold current ratio
  • Low resistance


  • Computer
  • Automotive
  • Telecommunications
  • Industrial
  • Consumer

 V isit our shop for Littlefuse resettable fuse solutions


See also

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