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 (CLP) 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
Bourns Resettable Fuses - PPTC 30V 1.85A-HD 40A MAX
Datasheet
6.585In Stock
Min.: 1
Mult.: 1

MF-R PCB Mount Radial 1.85 A 30 VDC 3.7 A 40 A 70 mOhms - 40 C + 85 C 5.1 mm Bulk
Bourns Resettable Fuses - PPTC 30V 4A-HD 40A MAX
Datasheet
366In Stock
9.000Expected 8/17/2026
Min.: 1
Mult.: 1

MF-R PCB Mount Radial 4 A 30 VDC 8 A 40 A 30 mOhms - 40 C + 85 C 5.1 mm Bulk
Littelfuse Resettable Fuses - PPTC 15V 1206 .500A POLYFUSE
Datasheet
2.599In Stock
24.000Expected 10/1/2026
MouseReel Available
Min.: 1
Mult.: 1
: 4.000

1206L SMD/SMT SMD/SMT 500 mA 15 VDC 1 A 100 A 750 mOhms 1206 (3216 metric) - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC PTC 16V 10A POLY RADIAL LEADS
Datasheet
1.656In Stock
Min.: 1
Mult.: 1
: 1.000

16R PCB Mount Radial 10 A 16 VDC 17 A 100 A 10.2 mOhms - 40 C + 85 C 5.1 mm Reel, Cut Tape
Littelfuse Resettable Fuses - PPTC PTC 16V 3A POLY RADIAL LEADS
Datasheet
1.375In Stock
Min.: 1
Mult.: 1

16R PCB Mount Radial 3 A 16 VDC 5.1 A 100 A 97.5 mOhms - 40 C + 85 C 5.1 mm Bulk
Littelfuse Resettable Fuses - PPTC 1812 15V .5A
Datasheet
1.643In Stock
8.000Expected 10/27/2026
MouseReel Available
Min.: 1
Mult.: 1
: 2.000

1812L SMD/SMT SMD/SMT 500 mA 15 VDC 1 A 100 A 1 Ohms 1812 (4532 metric) - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC 1812 13.2V 0.75A
Datasheet
4.336In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 2.000

1812L SMD/SMT SMD/SMT 750 mA 13.2 VDC 1.5 A 100 A 450 mOhms 1812 (4532 metric) - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC PTC POLYFUSE TELECOM 60V/250V .080A
Datasheet
886In Stock
1.200Expected 8/10/2026
Min.: 1
Mult.: 1
: 1.200

250R PCB Mount Radial 80 mA 60 VDC 160 mA 3 A 33 Ohms - 40 C + 85 C 5.1 mm Ammo Pack
Littelfuse Resettable Fuses - PPTC PTC 250/60V POLYFUSE SMD RA
Datasheet
2.377In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 1.500

250S PCB Mount SMD/SMT 130 mA 60 VDC 260 mA 3 A 10 Ohms - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC PTC 250/60V POLYFUSE SMD RB
Datasheet
1.103In Stock
1.500Expected 9/21/2026
MouseReel Available
Min.: 1
Mult.: 1
: 1.500

250S PCB Mount SMD/SMT 130 mA 60 VDC 260 mA 3 A 13 Ohms - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC 1.10A 33V 2920
Datasheet
4.451In Stock
32.000On Order
MouseReel Available
Min.: 1
Mult.: 1
: 2.000

2920L SMD/SMT SMD/SMT 1.1 A 33 VDC 2.2 A 40 A 410 mOhms 2920 (7450 metric) - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC 30V POLYFUSE 1.10A RADIAL LEADS
Datasheet
640In Stock
Min.: 1
Mult.: 1

30R PCB Mount Radial 1.1 A 30 VDC 2.2 A 40 A 170 mOhms - 40 C + 85 C 5.1 mm Bulk
Littelfuse Resettable Fuses - PPTC PTC 60V/600V.160A POLY TELECOM
Datasheet
15In Stock
1.000Expected 12/1/2026
Min.: 1
Mult.: 1
: 500

600R PCB Mount Radial 160 mA 60 VDC 320 mA 3 A 18 Ohms - 40 C + 85 C 5.1 mm Ammo Pack
Littelfuse Resettable Fuses - PPTC 60V POLYFUSE .100A RADIAL LEADS
Datasheet
2.079In Stock
Min.: 1
Mult.: 1

60R PCB Mount Radial 100 mA 60 VDC 200 mA 40 A 7.5 Ohms - 40 C + 85 C 5.1 mm Bulk
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
949In Stock
1.500Expected 8/13/2026
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
2.830In 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
2.153In 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 POLYFUSE 1.10A RADIAL LEADS
Datasheet
1.169In 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
511In Stock
1.200Expected 11/30/2026
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
1.191In Stock
2.500Expected 8/13/2026
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 .33A 240VAC 20/4.5A Imax
Datasheet
1.117In Stock
9.000On Order
Min.: 1
Mult.: 1

LVR PCB Mount Radial 330 mA 120 VAC/VDC 740 mA 20 A 2.6 Ohms - 40 C + 85 C 5.8 mm Bulk
Littelfuse Resettable Fuses - PPTC .1A 30V Micro SMD AEC-Q200
Datasheet
734In Stock
8.000Expected 10/13/2026
MouseReel Available
Min.: 1
Mult.: 1
: 4.000

microASMD SMD/SMT SMD/SMT 100 mA 30 VDC 250 mA 10 A 15 Ohms 1210 (3225 metric) - 40 C + 85 C AEC-Q100 Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC .1A 60V Mini SMD AEC-Q200
Datasheet
211In Stock
10.000Expected 8/17/2026
MouseReel Available
Min.: 1
Mult.: 1
: 2.000

miniASMD SMD/SMT SMD/SMT 100 mA 60 VDC 300 mA 40 A 12.7 Ohms 1812 (4532 metric) - 40 C + 85 C AEC-Q100 Reel, Cut Tape, MouseReel