FUSES / SICHERUNGEN PFRT
Resettable fuses
www.schurter.com
21
Typical Time to Trip at 23 ˚C
Time to trip (s)
Dimensions
Applications
Used as a secondary overcur-
rent protection device in:
•Customer Premise Equipment
(CPE)
•Central Office (CO)
•Subscriber Line Interface
Cards (SLIC)
Test Procedures And Requirements For Model PFRT Series
Test / Test Test Conditions / Bedingungen Accept/Reject Criteria
Visual/Mech. / visuell/mech. Verify dimensions and materials / Kontrolle Abmess./Mat. Per MF physical description
Resistance / Widerstand In still air @ 23 °C / bei ruhiger Luft 23 °C Rmin ≤R ≤Rmax
Time to Trip / Trip-Zeit 5 times Ihold, Vmax
23 °C / 5-facher Haltestrom T ≤ max. time to trip (sec.)
Hold Current / Haltestrom 30 min. at Ihold / bei Haltestrom No trip
Trip Cycle Life / Trip-Zyklen Vmax, Imax, 100 cycles / Zyklen No arcing or burning
Trip Endurance / Zeit im Tripzustand Vmax, 48 hours / Stunden No arcing or burning
Environmental Characteristics
Operating/Storage Temperature / Einsatz/Lagertemp. -45 °C to +85 °C
Maximum Device Surface Temperature in Tripped State / 125 °C
Passive Aging / passive Alterung +85 °C, 1000 hours / Std. ± 2% typ. resist. change
+60 °C, 1000 hours / Std. ± 3% typ. resist. change
Humidity Aging / Feuchtigkeitsalterung +85 °C, 85% R.H. 500 hours / Std. ± 3% typ. resist. change
Thermal Shock / Thermischer Schock MIL-STD-202F, Method 107G ±10% typ. resist. change
+125 °C/–55 °C, 10 times / Zyklen ±15% typ. resist. change
Solvent Resistance / Lösungsmittel-Beständigkeit MIL-STD-202, Method 215B No change
Lead Solerability / Lötbarkeit ANSI/J-STD-002
Flammability / Entflammbarkeit IEC 695-2-2 No Flame for 60 sec.
Vibration MIL-STD-883C, Method 2007.1, No change
Condition A
Typical Part Marking
Layout may vary
Manufacturer’s Trademark
Restance bin
Lot No. (T = Taiwan, S = Xiamen)
Part identification
Date code (First digit = Last digit of
year; next three digits = day of year)
50 75 100
Fault current (A)
100
100
10
1
0.10
0.01 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3
PFRT.018.250.U
PFRT.014.250 & PFRT.014.250.U
PFRT.012.250 & PFRT.012.250.U
PFRT.011.250.U
PFRT.008.250 & PFRT.008.250.U
AE
B
C
D
Wire leaded
PTC-Fuses
Type PFRT
High voltage surge
capabilities
Compliance to ITU
K.20/K.21 specifications
Agency recognition:
UL, CSA, TÜV
FUSES / SICHERUNGEN PFRT
Resettable fuses
www.schurter.com
22
Electrical Characteristics
Type / Typ
AB CDEPhysical Characteristics
max. max. max. nom. nom. Style Lead Dia. Material
PFRT.008.250.U 4.8 9.1 5.1 ± 0.7 4.7 5.0 1 0.65 Sn/Cu
(0.189) (0.358) (0.201 ± 0.028) (0.185) (0.197) (0.026)
PFRT.008.250 5.3 9.3 5.1 ± 0.7 4.7 5.0 1 0.65 Sn/Cu
(0.209) (0.366) (0.201 ± 0.028) (0.185) (0.197) (0.026)
PFRT.011.250.U 5.3 9.4 5.1 ± 0.7 4.7 5.0 1 0.65 Sn/Cu
(0.209) (0.370) (0.201 ± 0.028) (0.185) (0.197) (0.026)
PFRT.012.250 6.5 11.0 5.1 ± 0.7 4.7 5.0 1 0.65 Sn/Cu
(0.256) (0.433) (0.201 ± 0.028) (0.185) (0.197) (0.026)
PFRT.012.250.U 6.0 10.0 5.1 ± 0.7 4.7 5.0 1 0.65 Sn/Cu
(0.236) (0.394) (0.201 ± 0.028) (0.185) (0.197) (0.026)
PFRT.014.250 6.5 11.0 5.1 ± 0.7 4.7 5.0 1 0.65 Sn/Cu
(0.256) (0.433) (0.201 ± 0.028) (0.185) (0.197) (0.026)
PFRT.014.250.U 6.0 10.0 5.1 ± 0.7 4.7 5.0 1 0.65 Sn/Cu
(0.236) (0.394) (0.201 ± 0.028) (0.185) (0.197) (0.026)
PFRT.018.250.U 6.0 10.0 5.1 ± 0.7 4.7 5.0 1 0.65 Sn/Cu
(0.236) (0.394) (0.201 ± 0.028) (0.185) (0.197) (0.026)
Dimensions
How To Order
PF RT .xxx .xxx .x .x .x
PTC-Fuse
Series
RT = Radial Leaded
Telecom Component
Hold Current, Ihold
008-018 (0.08-018 Amps)
Max. Interrupt Voltage, V
250 (250 V)
Resistance Sorted
E = 7–12 Ω, F = 6–10 Ω, G = 6–9 Ω, H = 8–10,5 Ω
.B = Bare Disc
.U = Uncoated Parts
- = Bulk Packaging
.2 = Tape & Reel
Thermal Derating Chart-Ihold (Amps)
Type / Typ
Ambient Operating Temperature
–40 ˚C –20 ˚C 0 ˚C 23 ˚C 40 ˚C 50 ˚C 60 ˚C 70 ˚C 85 ˚C
PFRT.008.250 0.124 0.110 0.095 0.080 0.066 0.059 0.051 0.044 0.033
PFRT.011.250 0.171 0.151 0.131 0.110 0.091 0.081 0.071 0.061 0.046
PFRT.012.250 0.186 0.165 0.143 0.120 0.099 0.088 0.077 0.066 0.050
PFRT.014.250 0.255 0.199 0.172 0.145 0.119 0.106 0.091 0.080 0.060
PFRT.018.250 0.269 0.240 0.211 0.180 0.153 0.138 0.123 0.109 0.087
Dimensions in mm/inches
Type / Typ Max. Oper. Max. Interrupt Hold Current / Initial Resistance / One Hour
Voltage / Ratings / Post-Trip
Resistance /
Volts Volts Amps Amps Ohms Ohms Ohms
at / bei 23 °C at / bei 23 °C at / bei 23 °C at / bei 23 °C
max. max. Ihmin. max.
PFRT.008.250.U 60 250 3.0 0.08 14.0 20.0 33.0
PFRT.008.250 60 250 3.0 0.08 15.0 22.0 33.0
PFRT.011.250.U 60 250 3.0 0.11 5.0 9.0 16.0
PFRT.012.250 60 250 3.0 0.12 4.0 8.0 16.0
PFRT.012.250.U 60 250 3.0 0.12 6.0 10.0 16.0
PFRT.014.250 60 250 3.0 0.14 3.0 6.0 12.0
PFRT.014.250.U 60 250 3.0 0.14 3.5 6.5 12.0
PFRT.018.250.U 60 250 10.0 0.18 0.8 2.0 4.0
Packaging options: Bulk: 500 pcs. per bag, Tape and reel: 3000 pcs. per reel
