RKEF Series - 60V PolySwitch Lead-Free Radial Leaded Resettable PPTC

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Disclaimer Notice

Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own applications. Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, 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.

Our radial-leaded products represent the most comprehensive and complete set of PPTC products available in the industry today. RGEF series for hold currents up to 14A. RHEF series for flatter thermal derating and operating temperatures up to 125°C. RUEF series for balance of voltage rating (30V) and hold current (up to 9A). RUSBF series for fast time-to-trip and low-resistance computer applications. RXEF series for low hold currents (down to 50mA) and high voltage rating (up to 72V). RKEF series for balance of voltage rating (60V) and hold current (up to 5A). LVR series for line voltage rated applications now offering RoHS versions of all products.


  • Resettable and single-use overcurrent devices
  • Wide range of form factor and termination methods
  • Devices compatible with high-volume electronics assembly

Consumer and Industrial

  • Satellite video receivers
  • Industrial controls
  • Transformers
  • Computer motherboards
  • Modems
  • USB hubs, ports and peripherals
  • IEEE 1394 ports
  • CD-ROMs
  • Game machines
  • Battery packs
  • Phones
  • Fax machines
  • Analog and digital line cards
  • Printers

Access specifications, certifications, check availability and order parts below

Catalog #IHold (A)ITRIP
Trip Time
Pd Typical (watts)Max Operating Temp (°C)Packaging
RKEF0500.51400.320.5290.90.860185BagProduct SpecificationCheck
RKEF050-AP0.51400.320.5290.90.860185Ammo PackProduct SpecificationCheck
RKEF0650.651.3400.250.450.721601.2585BagProduct SpecificationCheck
RKEF065-AP0.651.3400.250.450.721601.2585Ammo PackProduct SpecificationCheck
RKEF0750.751.5400.20.390.641.5601.485BagProduct SpecificationCheck
RKEF075-20.751.5400.20.390.641.5601.485Tape & ReelProduct SpecificationCheck
RKEF0900.91.8400.190.320.522601.585BagProduct SpecificationCheck
RKEF1101.12.2400.170.280.473602.285BagProduct SpecificationCheck
RKEF1351.352.7400.110.220.374.5602.385BagProduct SpecificationCheckOrder
RKEF1601.63.2400.10.20.329602.485BagProduct SpecificationCheck
RKEF1851.853.7400.060.1520.2512.6602.685BagProduct SpecificationCheck
RKEF2502.55400.040.0850.1415.6602.885BulkProduct SpecificationCheck
RKEF250K2.55400.040.0850.1415.6602.885BagProduct SpecificationCheckOrder
RKEF250K-22.55400.040.0850.1415.6602.885Tape & ReelProduct SpecificationCheck
RKEF30036400.030.050.0819.8603.285BagProduct SpecificationCheck
RKEF300-236400.030.050.0819.8603.285Tape & ReelProduct SpecificationCheck
RKEF3753.757.5400.0170.040.0622603.485BagProduct SpecificationCheck
RKEF375K3.757.5400.0170.040.0622603.485BagProduct SpecificationCheckOrder
RKEF40048400.0140.0380.0624603.785BagProduct SpecificationCheck
RKEF500510400.0120.030.052860585BagProduct SpecificationCheck
RKEF500-1510400.0120.030.052860585BulkProduct SpecificationCheck
RKEF500-2510400.0120.030.052860585Tape & ReelProduct SpecificationCheck
RKEF500K-2510400.0120.030.052860585Tape & ReelProduct SpecificationCheck