Resettable PTCs

Telecom

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PolySwitch Telecom Resettable PTCs

250R

Datasheet

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.

Features:

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

Electrical Characteristics
- Catalog # 250R080
- I_Hold (A) 0.08
- I_TRIP
  (A) 0.16
- Max Volts
  (V) 250
- I_MAX
  (A) 3
- P_DMAX
  (W) 1
- R_MIN
  (Ω) 14
- R_1max
  (Ω) 33
- Max
  Time
  To
  Trip
  (A) 0.35
- Max
  Time
  to
  Trip Time
  (Sec) 4
- Temp
  (deg C) -40¦C - + 85¦C
- Check Stock Order Sample
- Catalog # 250R080T
- I_Hold (A) 0.08
- I_TRIP
  (A) 0.16
- Max Volts
  (V) 250
- I_MAX
  (A) 3
- P_DMAX
  (W) 1
- R_MIN
  (Ω) 15
- R_1max
  (Ω) 33
- Max
  Time
  To
  Trip
  (A) 0.35
- Max
  Time
  to
  Trip Time
  (Sec) 4
- Temp
  (deg C) -40¦C - + 85¦C
- Check Stock Order Sample
- Catalog # 250R120
- I_Hold (A) 0.12
- I_TRIP
  (A) 0.24
- Max Volts
  (V) 250
- I_MAX
  (A) 3
- P_DMAX
  (W) 1
- R_MIN
  (Ω) 4
- R_1max
  (Ω) 16
- Max
  Time
  To
  Trip
  (A) 1
- Max
  Time
  to
  Trip Time
  (Sec) 2.5
- Temp
  (deg C) -40¦C - + 85¦C
- Check Stock Order Sample
- Catalog # 250R120-R1
- I_Hold (A) 0.12
- I_TRIP
  (A) 0.24
- Max Volts
  (V) 250
- I_MAX
  (A) 3
- P_DMAX
  (W) 1
- R_MIN
  (Ω) 6
- R_1max
  (Ω) 16
- Max
  Time
  To
  Trip
  (A) 1
- Max
  Time
  to
  Trip Time
  (Sec) 2.5
- Temp
  (deg C) -40¦C - + 85¦C
- Check Stock
- Catalog # 250R120-R2
- I_Hold (A) 0.12
- I_TRIP
  (A) 0.24
- Max Volts
  (V) 250
- I_MAX
  (A) 3
- P_DMAX
  (W) 1
- R_MIN
  (Ω) 8
- R_1max
  (Ω) 16
- Max
  Time
  To
  Trip
  (A) 1
- Max
  Time
  to
  Trip Time
  (Sec) 2.5
- Temp
  (deg C) -40¦C - + 85¦C
- Check Stock
- Catalog # 250R120-R3
- I_Hold (A) 0.12
- I_TRIP
  (A) 0.24
- Max Volts
  (V) 250
- I_MAX
  (A) 3
- P_DMAX
  (W) 1
- R_MIN
  (Ω) 8
- R_1max
  (Ω) 16
- Max
  Time
  To
  Trip
  (A) 1
- Max
  Time
  to
  Trip Time
  (Sec) 2.5
- Temp
  (deg C) -40¦C - + 85¦C
- Check Stock
- Catalog # 250R120-RA
- I_Hold (A) 0.12
- I_TRIP
  (A) 0.24
- Max Volts
  (V) 250
- I_MAX
  (A) 3
- P_DMAX
  (W) 1
- R_MIN
  (Ω) 7
- R_1max
  (Ω) 16
- Max
  Time
  To
  Trip
  (A) 1
- Max
  Time
  to
  Trip Time
  (Sec) 2.5
- Temp
  (deg C) -40¦C - + 85¦C
- Check Stock Order Sample
- Catalog # 250R120-RC
- I_Hold (A) 0.12
- I_TRIP
  (A) 0.24
- Max Volts
  (V) 250
- I_MAX
  (A) 3
- P_DMAX
  (W) 1
- R_MIN
  (Ω) 5.4
- R_1max
  (Ω) 14
- Max
  Time
  To
  Trip
  (A) 1
- Max
  Time
  to
  Trip Time
  (Sec) 3
- Temp
  (deg C) -40¦C - + 85¦C
- Check Stock Order Sample
- Catalog # 250R120-RF
- I_Hold (A) 0.12
- I_TRIP
  (A) 0.24
- Max Volts
  (V) 250
- I_MAX
  (A) 3
- P_DMAX
  (W) 1
- R_MIN
  (Ω) 6
- R_1max
  (Ω) 16
- Max
  Time
  To
  Trip
  (A) 1
- Max
  Time
  to
  Trip Time
  (Sec) 2.5
- Temp
  (deg C) -40¦C - + 85¦C
- Check Stock
- Catalog # 250R120T
- I_Hold (A) 0.12
- I_TRIP
  (A) 0.24
- Max Volts
  (V) 250
- I_MAX
  (A) 3
- P_DMAX
  (W) 1
- R_MIN
  (Ω) 7
- R_1max
  (Ω) 16
- Max
  Time
  To
  Trip
  (A) 1
- Max
  Time
  to
  Trip Time
  (Sec) 2.5
- Temp
  (deg C) -40¦C - + 85¦C
- Check Stock Order Sample
- Catalog # 250R145
- I_Hold (A) 0.145
- I_TRIP
  (A) 0.29
- Max Volts
  (V) 250
- I_MAX
  (A) 3
- P_DMAX
  (W) 1
- R_MIN
  (Ω) 3
- R_1max
  (Ω) 14
- Max
  Time
  To
  Trip
  (A) 1
- Max
  Time
  to
  Trip Time
  (Sec) 2.5
- Temp
  (deg C) -40¦C - + 85¦C
- Check Stock Order Sample
- Catalog # 250R145-RA
- I_Hold (A) 0.145
- I_TRIP
  (A) 0.29
- Max Volts
  (V) 250
- I_MAX
  (A) 3
- P_DMAX
  (W) 1
- R_MIN
  (Ω) 3
- R_1max
  (Ω) 12
- Max
  Time
  To
  Trip
  (A) 1
- Max
  Time
  to
  Trip Time
  (Sec) 2.5
- Temp
  (deg C) -40¦C - + 85¦C
- Check Stock Order Sample
- Catalog # 250R145-RB
- I_Hold (A) 0.145
- I_TRIP
  (A) 0.29
- Max Volts
  (V) 250
- I_MAX
  (A) 3
- P_DMAX
  (W) 1
- R_MIN
  (Ω) 4.5
- R_1max
  (Ω) 14
- Max
  Time
  To
  Trip
  (A) 1
- Max
  Time
  to
  Trip Time
  (Sec) 2.5
- Temp
  (deg C) -40¦C - + 85¦C
- Check Stock
- Catalog # 250R145T
- I_Hold (A) 0.145
- I_TRIP
  (A) 0.29
- Max Volts
  (V) 250
- I_MAX
  (A) 3
- P_DMAX
  (W) 1
- R_MIN
  (Ω) 5.4
- R_1max
  (Ω) 14
- Max
  Time
  To
  Trip
  (A) 1
- Max
  Time
  to
  Trip Time
  (Sec) 2.5
- Temp
  (deg C) -40¦C - + 85¦C
- Check Stock Order Sample
- Catalog # 250R180
- I_Hold (A) 0.18
- I_TRIP
  (A) 0.65
- Max Volts
  (V) 250
- I_MAX
  (A) 10
- P_DMAX
  (W) 1.8
- R_MIN
  (Ω) 0.8
- R_1max
  (Ω) 4
- Max
  Time
  To
  Trip
  (A) 1
- Max
  Time
  to
  Trip Time
  (Sec) 20
- Temp
  (deg C) -40¦C - + 85¦C
- Check Stock Order Sample
- Catalog # 250R180T
- I_Hold (A) 0.18
- I_TRIP
  (A) 0.65
- Max Volts
  (V) 250
- I_MAX
  (A) 10
- P_DMAX
  (W) 1.8
- R_MIN
  (Ω) 1.4
- R_1max
  (Ω) 4.5
- Max
  Time
  To
  Trip
  (A) 1
- Max
  Time
  to
  Trip Time
  (Sec) 21
- Temp
  (deg C) -40¦C - + 85¦C
- Check Stock Order Sample

Technical Resources
- Resettable PTC 250R Datasheet
  The 250R Series is designed to protect against short duration high voltage fault currents typically found in telecom applications...
- TaiwanConcord ISO 14001
- TaiwanConcord ISOTS 16949
- Product Selection Guide
  Electronics Circuit Protection Product Selection Guide - A guide to selecting Littelfuse circuit protection components for electronic applications...
- Circuit Protection Technology Application Matrix
  Littelfuse is the world leader in the design and manufacturing of fuses for the automotive, industrial, handheld, computer and telecom markets...