PTC Fuses for AC/DC Power Supplies

A Positive Thermal Coefficient fuse, or PTC thermistor, is a thermally sensitive semiconductor resistor that increases in resistance as temperature increases to limit current to a load. When the voltage input for a power supply is too far above or below what is specified, the excess current can damage components. Besides shutting down the power supply altogether, one can effectively limit the current by using the predictable resistive response of a PTC.

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Qty. RoHS ECAD Model Series
Mounting Style
Termination Style
Hold Current
Maximum Voltage
Trip Current
Current Rating - Max
Resistance
Package/Case
Minimum Operating Temperature
Maximum Operating Temperature
Lead Spacing
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Packaging
Littelfuse Resettable Fuses - PPTC 60V POLYFUSE .500A RADIAL LEADS
Datasheet
2.029In Stock
Min.: 1
Mult.: 1

60R PCB Mount Radial 500 mA 60 VDC 1 A 40 A 1.17 Ohms - 40 C + 85 C 5.1 mm Bulk
Littelfuse Resettable Fuses - PPTC 60V 1.10A RADIAL LEADS
Datasheet
2.583In Stock
Min.: 1
Mult.: 1
: 1.000

60R PCB Mount Radial 1.1 A 60 VDC 2.2 A 40 A 380 mOhms - 40 C + 85 C 5.1 mm Ammo Pack
Littelfuse Resettable Fuses - PPTC 60V POLYFUSE 1.10A RADIAL LEADS
Datasheet
1.069In Stock
1.500Expected 10/7/2026
Min.: 1
Mult.: 1

60R PCB Mount Radial 1.1 A 60 VDC 2.2 A 40 A 380 mOhms - 40 C + 85 C 5.1 mm Bulk
Littelfuse Resettable Fuses - PPTC .12A 240VAC 20/1.2A Imax
Datasheet
1.461In Stock
Min.: 1
Mult.: 1

LVR PCB Mount Radial 120 mA 240 VAC/VDC 300 mA 1.2 A 12 Ohms - 40 C + 85 C 5.8 mm Bulk
Littelfuse Resettable Fuses - PPTC .25A 240VAC 20/3.5A Imax
Datasheet
3.691In Stock
Min.: 1
Mult.: 1

LVR PCB Mount Radial 250 mA 120 VAC/VDC 560 mA 20 A 3.8 Ohms - 20 C + 85 C 5.8 mm Bulk
Littelfuse Resettable Fuses - PPTC .14A 60V Mini SMD AEC-Q200
Datasheet
3.803In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 2.000

miniASMD SMD/SMT SMD/SMT 140 mA 60 VDC 280 mA 10 A 6 Ohms 1812 (4532 metric) - 40 C + 85 C AEC-Q100 Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC .2A 30V Mini SMD AEC-Q200
Datasheet
4.800In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 2.000

miniASMD SMD/SMT SMD/SMT 200 mA 30 VDC 400 mA 10 A 3.3 Ohms 1812 (4532 metric) - 40 C + 85 C AEC-Q100 Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC .3A 30V Mini SMD AEC-Q200
Datasheet
796In Stock
10.000Expected 11/24/2026
MouseReel Available
Min.: 1
Mult.: 1
: 2.000

miniASMD SMD/SMT SMD/SMT 300 mA 30 VDC 600 mA 40 A 1.75 Ohms 1812 (4532 metric) - 40 C + 85 C AEC-Q100 Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC 1.1A 16V Mini SMD AEC-Q200
Datasheet
3.988In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 2.000

miniASMD SMD/SMT SMD/SMT 1.1 A 16 VDC 2.2 A 100 A 180 mOhms 1812 (4532 metric) - 40 C + 85 C AEC-Q100 Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC 1.1A 24V Mini SMD AEC-Q200
Datasheet
1.414In Stock
1.500Expected 11/2/2026
MouseReel Available
Min.: 1
Mult.: 1
: 1.500

miniASMD SMD/SMT SMD/SMT 1.1 A 24 VDC 2.2 A 20 A 180 mOhms 1812 (4532 metric) - 40 C + 85 C AEC-Q100 Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC 1.25A 16V Mini SMD AEC-Q200
Datasheet
1.734In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 2.000

miniASMD SMD/SMT SMD/SMT 1.25 A 16 VDC 2.5 A 100 A 140 mOhms 1812 (4532 metric) - 40 C + 85 C AEC-Q100 Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC 1.5A 16V Mini SMD AEC-Q200
Datasheet
2.453In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 2.000

miniASMD SMD/SMT SMD/SMT 1.5 A 16 VDC 2.8 A 100 A 110 mOhms 1812 (4532 metric) - 40 C + 85 C AEC-Q100 Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC 1.5A 24V Mini SMD AEC-Q200
Datasheet
2.102In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 1.000

miniASMD SMD/SMT SMD/SMT 1.5 A 24 VDC 3 A 20 A 120 mOhms 1812 (4532 metric) - 40 C + 85 C AEC-Q100 Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC 2.6A 16V Mini SMD AEC-Q200
Datasheet
3.217In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 1.500

miniASMD SMD/SMT SMD/SMT 2.6 A 16 VDC 5 A 100 A 50 mOhms 1812 (4532 metric) - 40 C + 85 C AEC-Q100 Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC 1.10A 16V 100A Imax
Datasheet
4.953In Stock
12.000Expected 9/29/2026
MouseReel Available
Min.: 1
Mult.: 1
: 2.000

miniSMD PCB Mount SMD/SMT 1812 (4532 metric) + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC .16A 48V Nano SMD AEC-Q200
Datasheet
3.306In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 3.000

nanoASMDC SMD/SMT SMD/SMT 160 mA 48 VDC 450 mA 10 A 5 Ohms 1206 (3216 metric) - 40 C + 85 C AEC-Q200 Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC .2A 24V Nano SMD AEC-Q200
Datasheet
221In Stock
6.000Expected 10/26/2026
MouseReel Available
Min.: 1
Mult.: 1
: 3.000

nanoASMDC SMD/SMT SMD/SMT 200 mA 24 VDC 420 mA 100 A 3.1 Ohms 1206 (3216 metric) - 40 C + 85 C AEC-Q100 Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC .35A RESETTABLE SMD FUSE
Datasheet
20.142In Stock
30.000Expected 8/27/2026
MouseReel Available
Min.: 1
Mult.: 1
: 3.000

nanoSMD SMD/SMT SMD/SMT 350 mA 16 VDC 750 mA 20 A 1.35 Ohms 1206 (3216 metric) - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC RGEF1200
Datasheet
979In Stock
Min.: 1
Mult.: 1

RGEF PCB Mount Radial 12 A 16 VDC 20.4 A 100 A 8.6 mOhms - 40 C + 85 C 10.9 mm Bulk
Littelfuse Resettable Fuses - PPTC RGEF700
Datasheet
286In Stock
1.500Expected 12/14/2026
Min.: 1
Mult.: 1

RGEF PCB Mount Radial 7 A 16 VDC 11.9 A 100 A 20 mOhms - 40 C + 85 C 5.8 mm Bulk
Littelfuse Resettable Fuses - PPTC RGEF900
Datasheet
2.210In Stock
5.000Expected 8/24/2026
Min.: 1
Mult.: 1

RGEF PCB Mount Radial 9 A 16 VDC 15.3 A 100 A 13.5 mOhms - 40 C + 85 C 5.8 mm Bulk
Littelfuse Resettable Fuses - PPTC 60V 40A 1.40W Radial-leaded Device
Datasheet
388In Stock
1.000Expected 12/14/2026
Min.: 1
Mult.: 1

RKEF PCB Mount Radial 750 mA 60 VDC 1.5 A 40 A 390 mOhms - 40 C + 85 C 5.84 mm Bulk
Littelfuse Resettable Fuses - PPTC 30V 900MA 100A RUEF
Datasheet
1.564In Stock
Min.: 1
Mult.: 1
: 2.000

RUEF PCB Mount Radial 900 mA 30 VDC 1.8 A 100 A 220 mOhms - 40 C + 85 C 5.8 mm Reel, Cut Tape
Littelfuse Resettable Fuses - PPTC 1.1A 30V 100A Imax
Datasheet
1.572In Stock
8.000Expected 10/13/2026
Min.: 1
Mult.: 1

RUEF PCB Mount Radial 1.1 A 30 VDC 2.2 A 100 A 170 mOhms - 40 C + 85 C 5.8 mm Bulk
Littelfuse Resettable Fuses - PPTC 3A 30V 100A Imax
Datasheet
2.275In Stock
Min.: 1
Mult.: 1
: 1.000

RUEF PCB Mount Radial 3 A 30 VDC 6 A 100 A 80 mOhms - 40 C + 85 C 5.8 mm Ammo Pack