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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Description Datasheet Availability Pricing (GBP) Filter the results in the table by unit price based on your quantity.
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
Qualification
Packaging
Littelfuse Resettable Fuses - PPTC 0.14A 60V 1812
Datasheet
16,541In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 1,500

1812L SMD/SMT SMD/SMT 140 mA 60 VDC 340 mA 10 A 6 Ohms 1812 (4532 metric) - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC 15V 2016 1.50A SURF MOUNT
Datasheet
7,649In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 1,500

2016L SMD/SMT SMD/SMT 1.5 A 15 VDC 3 A 40 A 180 mOhms 2016 (5041 metric) - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC 24V 2920 2A POLYFUSE
Datasheet
11,705In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 1,500

2920L SMD/SMT SMD/SMT 2 A 24 VDC 4 A 40 A 125 mOhms 2920 (7450 metric) - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC 60V 1.10A RADIAL LEADS
Datasheet
2,683In 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 .9A 30V SMD AEC-Q200
Datasheet
6,925In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 2,000

ASMD SMD/SMT SMD/SMT 900 mA 30 VDC 2.16 A 40 A 480 mOhms 2920 (7450 metric) - 40 C + 85 C AEC-Q100 Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC .16A 240VAC 20/2A Imax
Datasheet
6,006In Stock
7,000Expected 08/09/2026
Min.: 1
Mult.: 1

LVR PCB Mount Radial 160 mA 120 VAC/VDC 370 mA 20 A 7.8 Ohms - 40 C + 85 C 5.8 mm Bulk
Littelfuse Resettable Fuses - PPTC 30V 40A 1.75Ohms
Datasheet
16,918In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 2,000

miniSMD SMD/SMT SMD/SMT 300 mA 30 VDC 600 mA 40 A 1.75 Ohms 1812 (4532 metric) - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC .50A 24V 100A Imax
Datasheet
43,069In Stock
86,000Expected 13/10/2026
MouseReel Available
Min.: 1
Mult.: 1
: 2,000

miniSMD SMD/SMT SMD/SMT 500 mA 24 VDC 1 A 100 A 1 Ohms 1812 (4532 metric) - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC 24V 750MA-HD 40A MAX
Datasheet
15,099In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 1,500

miniSMD SMD/SMT SMD/SMT 750 mA 24 VDC 1.5 A 40 A 290 mOhms 1812 (4532 metric) - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC .12A 48V Nano SMD AEC-Q200
Datasheet
7,757In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 3,000

nanoASMDC SMD/SMT SMD/SMT 120 mA 48 VDC 390 mA 10 A 6.5 Ohms 1206 (3216 metric) - 40 C + 85 C AEC-Q100 Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC .35A 16V Nano SMD AEC-Q200
Datasheet
8,397In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 3,000

nanoASMDC SMD/SMT SMD/SMT 350 mA 16 VDC 750 mA 20 A 1.35 Ohms 1206 (3216 metric) - 40 C + 85 C AEC-Q100 Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC 3A 30V 100A Imax
Datasheet
12,877In Stock
22,710Expected 13/08/2026
Min.: 1
Mult.: 1

RUEF PCB Mount Radial 3 A 30 VDC 6 A 100 A 80 mOhms - 40 C + 85 C 5.8 mm Bulk
Littelfuse Resettable Fuses - PPTC 3A 30V 100A Imax
Datasheet
8,176In Stock
Min.: 1
Mult.: 1
: 2,500

RUEF PCB Mount Radial 3 A 30 VDC 6 A 100 A 80 mOhms - 40 C + 85 C 5.8 mm Reel, Cut Tape
Littelfuse Resettable Fuses - PPTC Radial Lead .3A 72V 40A Imax
Datasheet
Product Comments
16,575In Stock
23,500Expected 22/09/2026
Min.: 1
Mult.: 1

RXEF PCB Mount Radial 300 mA 72 VDC 600 mA 40 A 2.1 Ohms - 40 C + 85 C 5.8 mm Bulk
Littelfuse Resettable Fuses - PPTC Radial Lead .5A 72V 40A Imax
Datasheet
Product Comments
20,312In Stock
37,446On Order
Min.: 1
Mult.: 1

RXEF PCB Mount Radial 500 mA 72 VDC 1 A 40 A 1.17 Ohms - 40 C + 85 C 5.8 mm Bulk
Littelfuse Resettable Fuses - PPTC Radial Lead 2.5A 72V 40A Imax
Datasheet
Product Comments
19,646In Stock
14,400Expected 13/08/2026
Min.: 1
Mult.: 1

RXEF PCB Mount Radial 2.5 A 72 VDC 5 A 40 A 130 mOhms - 40 C + 85 C 10.9 mm Bulk
Littelfuse Resettable Fuses - PPTC Radial Lead 3A 72V 40A Imax
Datasheet
Product Comments
4,528In Stock
7,500Expected 14/10/2026
Min.: 1
Mult.: 1

RXEF PCB Mount Radial 3 A 72 VDC 6 A 40 A 100 mOhms - 40 C + 85 C 10.9 mm Bulk
Littelfuse Resettable Fuses - PPTC .75A 30V 40A Imax
Datasheet
15,888In Stock
18,000Expected 30/11/2026
MouseReel Available
Min.: 1
Mult.: 1
: 2,000

SMD SMD/SMT SMD/SMT 750 mA 30 VDC 1.5 A 40 A 1 Ohms 2920 (7450 metric) - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC 15V 40A 0.05Ohms
Datasheet
6,101In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 2,000

SMD SMD/SMT SMD/SMT 3 A 15 VDC 6 A 40 A 50 mOhms 2920 (7450 metric) - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC SRP175F
Datasheet
6,754In Stock
8,000Expected 23/11/2026
Min.: 1
Mult.: 1

SRP Strap Mount SMD/SMT 1.75 A 15 VDC 3.8 A 100 A 120 mOhms - 40 C + 85 C Bulk
Littelfuse Resettable Fuses - PPTC SRP200F
Datasheet
17,138In Stock
37,000On Order
Min.: 1
Mult.: 1

SRP Strap Mount SMD/SMT 2 A 30 VDC 4.4 A 100 A 100 mOhms - 40 C + 85 C Bulk
Bourns Resettable Fuses - PPTC RESETTABLE FUSE 230VOLT 10OHM
Datasheet
9,800In Stock
Min.: 1
Mult.: 1

CMF-RL PCB Mount Radial 150 mA 60 VDC 300 mA 3 A 10 Ohms - 40 C + 125 C 5 mm Tray
Bourns Resettable Fuses - PPTC 60V 100MA-HD 40A MAX
Datasheet
65,955In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 3,000

MF-MSMF SMD/SMT SMD/SMT 100 mA 60 VDC 300 mA 40 A 15 Ohms 1812 (4532 metric) - 40 C + 85 C AEC-Q100 Reel, Cut Tape, MouseReel
Bourns Resettable Fuses - PPTC 30V 120MA-HD 10A MAX
Datasheet
34,402In Stock
48,000Expected 21/09/2026
MouseReel Available
Min.: 1
Mult.: 1
: 3,000

MF-NSMF SMD/SMT SMD/SMT 120 mA 30 VDC 290 mA 10 A 8.5 Ohms 1206 (3216 metric) - 40 C + 85 C AEC-Q100 Reel, Cut Tape, MouseReel
Bourns Resettable Fuses - PPTC 72V 1.1A-HD 40A MAX
Datasheet
4,119In Stock
Min.: 1
Mult.: 1
: 3,000

MF-RX/72 PCB Mount Radial 1.1 A 72 VDC 2.2 A 40 A 250 mOhms - 40 C + 85 C 5.1 mm Reel, Cut Tape