PolySwitch Resettable Devices

Littelfuse PolySwitch and POLY-FUSE Devices are Polymeric Positive Temperature Coefficient (PPTC) devices that offer a resettable overcurrent protection alternative, reducing warranty, service, and repair costs. PTCs increase resistance as temperature increases due to increased flow. The components are designed to limit unsafe currents while allowing constant safe current levels, resistance will "reset" automatically when the fault is removed, and temperature returns to safe levels. The ability of the PTCs to reset themselves after exposure to a fault current makes them ideal within circuits that are not easily accessible. PTCs are typically used as circuit protection in applications where sensitive components are at constant risk of damage from overcurrent conditions. The components are also ideal for situations where frequent overcurrent conditions occur or constant uptime is required. Littelfuse Resettable PTCs (PPTCs) are typically used in consumer electronics, power line, telecom, I/O port, process control and medical equipment protection applications.

Results: 982
Select Image Part # Mfr. Description Datasheet Availability Pricing (USD) 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 30V POLYFUSE 1.35A RADIAL LEADS 3,366In Stock
Min.: 1
Mult.: 1
: 2,000

30R PCB Mount Radial 1.35 A 30 VDC 2.7 A 40 A 130 mOhms - 40 C + 85 C 5.1 mm Ammo Pack
Littelfuse Resettable Fuses - PPTC 13.2V 500MA-HD 40A 1210 3,378In Stock
Min.: 1
Mult.: 1
miniASMD SMD/SMT SMD/SMT 500 mA 13.2 VDC 1 A 40 A 900 mOhms 1210 (3225 metric) - 40 C + 85 C
Littelfuse Resettable Fuses - PPTC .23A 60V SMD AEC-Q200 2,021In Stock
Min.: 1
Mult.: 1
: 2,000

ASMD PCB Mount SMD/SMT 230 mA 60 VDC 590 mA 10 A 4.8 Ohms - 40 C + 85 C AEC-Q100 Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC 4.5A 2Pin T/R LN VOLTAGE PRODUCTS 1,875In Stock
Min.: 1
Mult.: 1
: 2,000

LVR PCB Mount Radial 330 mA 240 VAC/VDC 740 mA 4.5 A 2.6 Ohms - 40 C + 85 C 5.8 mm Reel, Cut Tape
Littelfuse Resettable Fuses - PPTC 4.5A 2Pin T/R LN VOLTAGE PRODUCTS 2,933In Stock
Min.: 1
Mult.: 1
: 2,000

LVR PCB Mount Radial 330 mA 120 VAC/VDC 740 mA 20 A 2.6 Ohms - 40 C + 85 C 5.8 mm Reel, Cut Tape
Littelfuse Resettable Fuses - PPTC RGEF800-2 2,353In Stock
Min.: 1
Mult.: 1
: 1,500

RGEF PCB Mount Radial 8 A 16 VDC 13.6 A 100 A 17.5 mOhms - 40 C + 85 C 5.8 mm Reel, Cut Tape
Littelfuse Resettable Fuses - PPTC 1.6A 30V 40A Imax 3,673In Stock
Min.: 1
Mult.: 1
: 2,000

RUEF PCB Mount Radial 1.6 A 30 VDC 3.2 A 100 A 110 mOhms - 40 C + 85 C 5.8 mm Reel, Cut Tape
Littelfuse Resettable Fuses - PPTC 2.5A 30V 40A Imax Uncoated 3,930In Stock
Min.: 1
Mult.: 1
: 3,000

RUEF PCB Mount Radial 2.5 A 30 VDC 5 A 100 A 70 mOhms - 40 C + 85 C 5.8 mm Reel, Cut Tape
Littelfuse Resettable Fuses - PPTC 9A 30V 40A Imax 1,410In Stock
Min.: 1
Mult.: 1
: 1,000

RUEF PCB Mount Radial 9 A 30 VDC 18 A 100 A 20 mOhms - 40 C + 85 C 10.9 mm Reel, Cut Tape
Littelfuse Resettable Fuses - PPTC 2.6A 6V 40A Imax 3,587In Stock
Min.: 1
Mult.: 1
: 2,000

SMD SMD/SMT SMD/SMT 2.6 A 6 VDC 5.2 A 40 A 75 mOhms 2920 (7450 metric) - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC PTC 6V 1.55A POLY RADIAL LEADS 3,854In Stock
Min.: 1
Mult.: 1
: 2,000

USBR PCB Mount Radial 1.55 A 6 VDC 2.7 A 40 A 100 mOhms - 40 C + 85 C 5.1 mm Ammo Pack
Littelfuse Resettable Fuses - PPTC 1.25A 15V 2920 1,760In Stock
2,000Expected 15/12/2026
Min.: 1
Mult.: 1
: 2,000

2920L SMD/SMT SMD/SMT 1.25 A 15 VDC 2.5 A 40 A 250 mOhms 2920 (7450 metric) - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC 13.2V 500MA-HD 70A SMD 2,671In Stock
Min.: 1
Mult.: 1
miniASMD SMD/SMT SMD/SMT 500 mA 13.2 VDC 1.1 A 70 A 750 mOhms 1206 (3216 metric) - 40 C + 85 C
Littelfuse Resettable Fuses - PPTC 3 Ohms 40 A 9 VDC - 40 C+ 85 C 2,351In Stock
Min.: 1
Mult.: 1
: 5,000

femtoSMD PCB Mount SMD/SMT 200 mA 9 VDC 450 mA 40 A 3 Ohms - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC 16V 2A-HD 100A RHEF 3,426In Stock
Min.: 1
Mult.: 1
: 2,500

RHEF PCB Mount Radial 2 A 16 VDC 3.8 A 100 A 110 mOhms - 40 C + 125 C 5.8 mm Reel, Cut Tape
Littelfuse Resettable Fuses - PPTC PTC 6V POLY SURF MOUNT 1210 1.75A 2,691In Stock
Min.: 1
Mult.: 1
: 3,000

1210L SMD/SMT SMD/SMT 1.75 A 6 VDC 3.5 A 100 A 80 mOhms 1210 (3225 metric) - 40 C + 85 C Reel, Cut Tape
Littelfuse Resettable Fuses - PPTC 8V 1.5A 4,910In Stock
Min.: 1
Mult.: 1
: 2,000

1812L SMD/SMT SMD/SMT 1.5 A 8 VDC 3 A 100 A 110 mOhms 1812 (4532 metric) - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC 6V 5.0A-HD 100A SMD 2,575In Stock
Min.: 1
Mult.: 1
: 1,500

2016L SMD/SMT SMD/SMT 5 A 6 VDC 10 A 100 A 25 mOhms 2016 (5041 metric) - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC .05A 240VAC 20/1A Imax 4,252In Stock
Min.: 1
Mult.: 1
: 1,500

LVR PCB Mount Radial 50 mA 120 VAC/VDC 120 mA 20 A 65 Ohms - 40 C + 85 C 5.8 mm Reel, Cut Tape
Littelfuse Resettable Fuses - PPTC 1.85A 30V 100A Imax 4,601In Stock
Min.: 1
Mult.: 1
: 3,000

RUEF PCB Mount Radial 1.85 A 30 VDC 3.7 A 100 A 90 mOhms - 40 C + 85 C 5.8 mm Reel, Cut Tape
Littelfuse Resettable Fuses - PPTC 72V 40A 0.86Ohms 5,519In Stock
Min.: 1
Mult.: 1
: 3,000

RXEF PCB Mount Radial 400 mA 72 VDC 800 mA 40 A 860 mOhms - 40 C + 85 C 5.8 mm Reel, Cut Tape
Littelfuse Resettable Fuses - PPTC Radial Lead 1.35A 72V 40A Imax
2,979In Stock
Min.: 1
Mult.: 1
: 1,500

RXEF PCB Mount Radial 1.35 A 72 VDC 2.7 A 40 A 300 mOhms - 40 C + 85 C 5.8 mm Reel, Cut Tape
Littelfuse Resettable Fuses - PPTC 30V 40A 0.90W PolySwitch Reset Dev 1,904In Stock
Min.: 1
Mult.: 1

RUEF PCB Mount Radial 1.6 A 30 V 3.2 A 40 A 110 mOhms - 40 C + 85 C
Littelfuse Resettable Fuses - PPTC 1.1A 30V 40A Imax 834In Stock
Min.: 1
Mult.: 1
: 500

RUEF PCB Mount Radial 1.1 A 30 VDC 2.2 A 100 A 170 mOhms - 40 C + 85 C 5.8 mm Reel, Cut Tape
Littelfuse Resettable Fuses - PPTC 15V 0.05A Ih 30 Ohm 426In Stock
4,000On Order
Min.: 1
Mult.: 1
: 4,000

femtoSMD SMD/SMT SMD/SMT 50 mA 15 VDC 150 mA 40 A 30 Ohms 0603 (1608 metric) - 40 C + 85 C Reel, Cut Tape, MouseReel