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250R145 Datasheet(PDF) 1 Page - Littelfuse |
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250R145 Datasheet(HTML) 1 Page - Littelfuse |
1 / 7 page 97 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. 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. Electrical Characteristics Part Number I hold (A) I trip (A) V max V int / Vop I max (A) P d typ. (W) MaximumTime ToTrip Resistance Agency Approvals Current (A) Time (Sec.) R min (Ω) R typ (Ω) R 1max (Ω) 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 additional information. Description Features Applications range, 60VDC operating voltage resistance ranges available Equipment (CPE) telecom centers 250R Series Agency Approvals AGENCY AGENCY FILE NUMBER E183209 R50120008 I hold I trip V int V op= The device regular operation voltage I ) P d R min = Minimum resistance of device in initial (un-soldered) state. R typ = Typical resistance of device in initial (un-soldered) state. R Caution: Operation beyond the specified rating may result in damage and possible arcing and flame. |
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