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
Bourns Resettable Fuses - PPTC 72V .3A-HD 40A MAX
Datasheet
13,021In Stock
Min.: 1
Mult.: 1

MF-RX/72 PCB Mount Radial 300 mA 72 VDC 600 mA 40 A 1.36 Ohms - 40 C + 85 C 5.1 mm Bulk
Bourns Resettable Fuses - PPTC 72V 1.6A-HD 40A MAX
Datasheet
11,912In Stock
Min.: 1
Mult.: 1

MF-RX/72 PCB Mount Radial 1.6 A 72 VDC 3.2 A 40 A 140 mOhms - 40 C + 85 C 5.1 mm Bulk
Bourns Resettable Fuses - PPTC 250V 130MA-HD 3A MAX
Datasheet
20,255In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 4,000

MF-SD/250 PCB Mount SMD/SMT 130 mA 60 VDC 260 mA 3 A 7 Ohms - 45 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC .5A 24V Mini SMD AEC-Q200
Datasheet
14,348In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 2,000

miniASMD SMD/SMT SMD/SMT 500 mA 24 VDC 1 A 100 A 1 Ohms 1812 (4532 metric) - 40 C + 85 C AEC-Q100 Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC PTC POLYFUSE RADIAL 72V 1.85A
Datasheet
3,475In Stock
Min.: 1
Mult.: 1
: 1,000

72R PCB Mount Radial 1.85 A 72 VDC 3.7 A 40 A 190 mOhms - 40 C + 85 C 5.1 mm Ammo Pack
Littelfuse Resettable Fuses - PPTC 0.10A 15V 0805
Datasheet
5,894In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 4,000

0805L SMD/SMT SMD/SMT 100 mA 15 VDC 300 mA 100 A 6 Ohms 0805 (2012 metric) - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC .05A 30V Micro SMD AEC-Q200
Datasheet
7,625In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 4,000

microASMD SMD/SMT SMD/SMT 50 mA 30 VDC 150 mA 10 A 50 Ohms 1210 (3225 metric) - 40 C + 85 C AEC-Q100 Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC .12A 48V Nano SMD AEC-Q200
Datasheet
7,967In 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
Bourns Resettable Fuses - PPTC PTC RESETTABLE 0.3A 60V RADIAL LEADED
Datasheet
6,650In Stock
Min.: 1
Mult.: 1
: 3,000

MF-R PCB Mount Radial 300 mA 60 VDC 600 mA 40 A 1.36 Ohms - 40 C + 85 C 5.1 mm Reel, Cut Tape
Littelfuse Resettable Fuses - PPTC .14A 60V Mini SMD AEC-Q200
Datasheet
4,134In 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 PTC 250/60V POLYFUSE SMD RB
Datasheet
2,615In Stock
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 60V .170A RADIAL LEADS
Datasheet
2,846In Stock
Min.: 1
Mult.: 1
: 2,000

60R PCB Mount Radial 170 mA 60 VDC 340 mA 40 A 8 Ohms - 40 C + 85 C 5.1 mm Ammo Pack
Littelfuse Resettable Fuses - PPTC .75A 24V Mini SMD AEC-Q200
Datasheet
2,769In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 1,500

miniASMD SMD/SMT SMD/SMT 750 mA 24 VDC 1.5 A 40 A 290 mOhms 1812 (4532 metric) - 40 C + 85 C AEC-Q100 Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC 24V 1.1A-HD 40A MAX
Datasheet
90,683In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 1,500

miniSMD SMD/SMT SMD/SMT 1.1 A 24 VDC 2.2 A 20 A 180 mOhms 1812 (4532 metric) - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC .3A 60V 10A Imax
Datasheet
57,204In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 2,000

SMD SMD/SMT SMD/SMT 300 mA 60 VDC 600 mA 10 A 4.8 Ohms 2920 (7450 metric) - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC 60V 40A 12.7Ohms
Datasheet
16,718In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 2,000

miniSMD SMD/SMT SMD/SMT 100 mA 60 VDC 300 mA 40 A 12.7 Ohms 1812 (4532 metric) - 40 C + 85 C Reel, Cut Tape, MouseReel
Bourns Resettable Fuses - PPTC 24V 2.6A-HD 20A MAX
Datasheet
15,754In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 4,000

MF-LSMF SMD/SMT SMD/SMT 2.6 A 24 VDC 5.2 A 40 A 75 mOhms 2920 (7450 metric) - 40 C + 85 C Reel, Cut Tape, MouseReel
Bourns Resettable Fuses - PPTC 60V 100MA-HD 40A MAX
Datasheet
68,257In 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 24V 750MA-HD 40A MAX
Datasheet
18,295In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 4,000

MF-MSMF SMD/SMT SMD/SMT 750 mA 24 VDC 1.5 A 40 A 450 mOhms 1812 (4532 metric) - 40 C + 85 C AEC-Q100 Reel, Cut Tape, MouseReel
Bourns Resettable Fuses - PPTC 30V 120MA-HD 10A MAX
Datasheet
22,282In Stock
17,880Expected 17/07/2026
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 PTC RESETTABLE 0.9A 30V RADIAL LEADED
Datasheet
10,021In Stock
Min.: 1
Mult.: 1

MF-R/90 PCB Mount Radial 900 mA 30 VDC 1.8 A 40 A 120 mOhms - 40 C + 85 C 5.1 mm Bulk
Bourns Resettable Fuses - PPTC 72V 1.1A-HD 40A MAX
Datasheet
21,126In Stock
Min.: 1
Mult.: 1

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 Bulk
Bourns Resettable Fuses - PPTC 30V 1.85A-HD 40A MAX
Datasheet
8,981In 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 15V 2.0A-HD 40A MAX
Datasheet
Product Comments
10,611In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 3,000

MF-SM SMD/SMT SMD/SMT 2 A 15 VDC 4 A 100 A 125 mOhms 3425 (8764 metric) - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC 30V 1206 .160A POLYFUSE
Datasheet
9,386In Stock
36,000Expected 16/11/2026
MouseReel Available
Min.: 1
Mult.: 1
: 3,000

1206L SMD/SMT SMD/SMT 160 mA 30 VDC 370 mA 100 A 4.5 Ohms 1206 (3216 metric) - 40 C + 85 C Reel, Cut Tape, MouseReel