250R Series - 250V PolySwitch® Lead-Free Radial Leaded Resettable PPTC for Telecom Protection

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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.

The 250R series is designed to protect against short duration high voltage fault currents (power cross or power induction surge) typically found in telecom applications (250Vrms). The series can be used to help telecom networking equipment meet the protection requirements specified in ITU K.20 and K.21.

  • RoHS compliant and lead-free
  • Fast time-to-trip
  • Binned and sorted narrow resistance ranges available
  • 0.08 — 0.18 Hold current range, 60VDC operating voltage
  • 250VAC interrupt rating

Access specifications, certifications, check availability and order parts below

Catalog #IHold (A)ITRIP
Max Volts
Trip Time
(deg C)
250R0800.080.162503114330.354-40¦C - + 85¦C22Through HoleCheckOrder
250R080T0.080.162503115330.354-40¦C - + 85¦C22Through HoleCheckOrder
250R1200.120.242503141612.5-40¦C - + 85¦C8Through HoleCheckOrder
250R120-R10.120.242503161612.5-40¦C - + 85¦C9Through HoleCheckOrder
250R120-R20.120.242503181612.5-40¦C - + 85¦C10.5Through HoleCheckOrder
250R120-R30.120.242503181612.5-40¦C - + 85¦C10Through HoleCheckOrder
250R120-RA0.120.242503171612.5-40¦C - + 85¦C9Through HoleCheckOrder
250R120-RC0.120.24250315.41413-40¦C - + 85¦C7.5Through HoleCheckOrder
250R120-RF0.120.242503161612.5-40¦C - + 85¦C10.5Through HoleCheckOrder
250R120T0.120.242503171612.5-40¦C - + 85¦C12Through HoleCheckOrder
250R1450.1450.292503131412.5-40¦C - + 85¦C6Through HoleCheckOrder
250R145-RA0.1450.292503131212.5-40¦C - + 85¦C5.5Through HoleCheckOrder
250R145-RB0.1450.29250314.51412.5-40¦C - + 85¦C6Through HoleCheckOrder
250R145T0.1450.29250315.41412.5-40¦C - + 85¦C7.5Through HoleCheckOrder
250R1800.180.65250101.80.84120-40¦C - + 85¦C2.2Through HoleCheckOrder
250R180T0.180.65250101.81.44.5121-40¦C - + 85¦C3.9Through HoleCheckOrder

pdf icon Resettable PTC 250R Datasheet

The 250R Series is designed to protect against short duration high voltage fault currents typically found in telecom applications...

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Electronics Circuit Protection Product Selection Guide - A guide to selecting Littelfuse circuit protection components for electronic applications...

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