?2008 littelfuse, inc. revised: october 24, 2008 polyfuse ? resettable ptcs ?2008 littelfuse, inc. 2 5 0r series radial leaded > 250r series speci?cations are subject to change without notice. please refer to www.littelfuse.com/series/250r.html for current information. 250r series 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 speci?ed in itu k .20 and k .21. electrical characteristics part number i hold (a) i trip (a) v max v int / v op i max (a) p d max. (w) maximum time to trip resistance agency approvals current (a) time (sec.) r min ( ) r typ ( ) r 1max ( ) 250r080 0.08 0.16 250/60 3 1 0.35 3 14 22 33 xx 250r080t 0.08 0.16 250/60 3 1 0.35 3 15 22 33 xx 250r120 0.12 0.24 250/60 3 1 1 1.5 4 8 16 xx 250r120-ra 0.12 0.24 250/60 3 1 1 1.0 7 9 16 xx 250r120-rc 0.12 0.24 250/60 3 1 1 0.85 5.4 7.5 14 xx 250r120-rf 0.12 0.24 250/60 3 1 1 0.7 6 10.5 16 xx 250r120-r1 0.12 0.24 250/60 3 1 1 0.8 6 9 16 xx 250r120-r2 0.12 0.24 250/60 3 1 1 0.7 8 10.5 16 xx 250r120-r3 0.12 0.24 250/60 3 1 1 1 8 10 16 xx 250r120t 0.12 0.24 250/60 3 1 1 1.2 7 12 16 xx 250r145 0.145 0.29 250/60 3 1 1 2.5 3 6 14 xx 250r145-ra 0.145 0.29 250/60 3 1 1 5 3 5.5 12 xx 250r145-rb 0.145 0.29 250/60 3 1 1 2.5 4.5 6 14 xx 250r145t 0.145 0.29 250/60 3 1 1 2.0 5.4 7.5 14 xx 250r180 0.18 0.65 250/60 10 1.8 1 21 0.8 2.2 4 xx 250r180t 0.18 0.65 250/60 10 1.8 1 20 1.4 3.9 4.5 xx items with t at end of part number = pre-tripped device. see part ordering number system section of this data sheet for additio nal information. description features applications t 3 p ) 4 d p n q m j b o u b o e lead-free t ' b t u u j n f o u p u s j q t # j o o f e b o e t p s u f e o b s s p x resistance ranges available t o i p m e d v s s f o u range, 60vdc operating voltage t 7 " $ j o u f s s v q u s b u j o h t $ v t u p n f s 1 s f n j t f t equipment (cpe) t $ f o u s b m 0 g m d f $ 0
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