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
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Minimum Operating Temperature
Maximum Operating Temperature
Lead Spacing
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Packaging
Littelfuse Resettable Fuses - PPTC 60V POLYFUSE .300A RADIAL LEADS
Datasheet
969In Stock
Min.: 1
Mult.: 1

60R PCB Mount Radial 300 mA 60 VDC 600 mA 40 A 2.1 Ohms - 40 C + 85 C 5.1 mm Bulk
Littelfuse Resettable Fuses - PPTC 60V .400A RADIAL LEADS
Datasheet
2 764In Stock
Min.: 1
Mult.: 1
: 2 000

60R PCB Mount Radial 400 mA 60 VDC 800 mA 40 A 1.29 Ohms - 40 C + 85 C 5.1 mm Ammo Pack
Littelfuse Resettable Fuses - PPTC 60V POLYFUSE .400A RADIAL LEADS
Datasheet
2 449In Stock
Min.: 1
Mult.: 1

60R PCB Mount Radial 400 mA 60 VDC 800 mA 40 A 1.29 Ohms - 40 C + 85 C 5.1 mm Bulk
Littelfuse Resettable Fuses - PPTC 60V .500A RADIAL LEADS
Datasheet
2 330In Stock
Min.: 1
Mult.: 1
: 2 000

60R PCB Mount Radial 500 mA 60 VDC 1 A 40 A 1.17 Ohms - 40 C + 85 C 5.1 mm Ammo Pack
Littelfuse Resettable Fuses - PPTC 60V POLYFUSE .500A RADIAL LEADS
Datasheet
2 019In 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 07/10/2026
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 793In 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 760In 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
762In Stock
10 000Expected 15/09/2026
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 02/11/2026
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 729In 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 375In 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 207In 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 29/09/2026
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
306In Stock
9 000Expected 23/12/2026
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 22/12/2026
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 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 14/12/2026
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 000In Stock
5 000Expected 11/09/2026
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 10/11/2026
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