Littelfuse 250R Series - Manual (Page 3)

99
Revised: August 31, 2011
POLY-FUSE ® Resettable PTCs
© 2011 Littelfuse, Inc 250R Series
Radial Leaded > 250R Series
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/250R.html for current information.
250R S
eries
Protection Application Guide
Region/Specification Application Device Selection
South America/Asia/Europe
ITU K.45
"DDFTTOFUXPSLFRVJQNFOU
Remote terminal
Repeaters
8"/FRVJQNFOU
$SPTToDPOOFDU
250R180
250R180T
250R145
250R145T
250R120
250R120T
South America/Asia/Europe
ITU K.21
Customer and IT equipment
Analog modems
"%4-
Y%4-
Phone sets, PBX systems
Internet appliances
POS terminals
250R180
250R180T
250R145
250R145T
250R120
250R120T
South America/Asia/Europe
ITU K.20
Central Office
POTS/ISDN linecards
5&+MJOFDBSET
"%4-7%4-TQMJUUFST
CSU/DSU
250R180
250R180T
250R145
250R145T
250R120
250R120T
North America Telcordia
GR-974
1SJNBSZQSPUFDUJPONPEVMFT
MDF modules
Network interface
250R180
250R180T
250R145
250R145T
250R120
250R120T
South America/Asia/Europe
ITU K.20
North America Telcordia
GR-1089
*OUSBCVJMEJOHDPNNVOJDBUJPOTZTUFNT
-"/
70*1DBSET
-PDBMMPPQIBOETFUT
250R180
250R180T
250R145
250R145T
250R120
250R120T
South America/Asia/Europe
ITU K.20 and K.21
-"/*OUSBCVJMEJOHQPXFSDSPTT
Protection
-"/FRVJQNFOU
*1QIPOF
250R080
3FTJTUBODFCJOOFEQBSUTBSFSFDPNNFOEFE
Agency Specification Selection Guide For Telecom and Networking Applications
Product Lightning Power Cross
250R120
250R145 *56,oL7çT
*56,oL7çT *56,o7BD
û
*56,o7BD
û
250R180
*56,oL7çT
*56,oL7çT
5FMDPSEJB(3ooL7çT *56,o7BD
û
*56,o7BD
û
5FMDPSEJB(3o7BD
"
%FWJDFTTIPVMECFJOEFQFOEFOUMZFWBMVBUFEBOEUFTUFEGPSVTFJOBOZTQFDJmDBQQMJDBUJPO