RS-485 ESD, Lightning, & Power Fault Protection

Littelfuse RS-485 ESD, Lightning, and Power Fault Protection feature polymeric positive temperature coefficients (PPTCs) that can protect against short circuit and power crosses. The RS-485 product line includes the resettable PPTCs, TVS diodes, GDTs, and SIDACtor series. The TVS Diode Arrays and SM712 series are specifically designed to protect RS-485 applications from ESD, EFT, and lightning-induced surges. When lightning occurs, the SIDACtor will react by causing voltage to increase across PPTC until GDT fires. 

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Littelfuse Resettable Fuses - PPTC 600V .15A-HD 3A MAX
Datasheet
3,209In Stock
Min.: 1
Mult.: 1

TRF600 PCB Mount Radial 130 mA 250 VDC 300 mA 3 A 22 Ohms - 40 C + 85 C 5 mm Bulk
Littelfuse Resettable Fuses - PPTC .12A 250V
Datasheet
4,088In Stock
Min.: 1
Mult.: 1

TRF250 PCB Mount Radial 120 mA 60 VDC 240 mA 3 A 16 Ohms - 40 C + 85 C 5 mm Bulk
Littelfuse Resettable Fuses - PPTC 250V 3A 10Ohms
Datasheet
415In Stock
Min.: 1
Mult.: 1

TRF600 PCB Mount Radial 150 mA 250 VDC 300 mA 3 A 17 Ohms - 40 C + 85 C 5 mm Bulk
Littelfuse Resettable Fuses - PPTC 250V .12A-HD 3A MAX
Datasheet
3,870In Stock
Min.: 1
Mult.: 1
Reel: 1,500

TRF250 PCB Mount Radial 120 mA 60 VDC 240 mA 3 A 16 Ohms - 40 C + 85 C 5 mm Reel, Cut Tape
Littelfuse Resettable Fuses - PPTC Polyswitch 0.26A Restive Range -2
Datasheet
1,549In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1,500

TS250 PCB Mount SMD/SMT 130 mA 60 VDC 260 mA 3 A 15 Ohms - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC 600V .15A-HD 3A MAX
Datasheet
27,864In Stock
Min.: 1
Mult.: 1
Reel: 1,500

TRF600 PCB Mount Radial 150 mA 250 VDC 300 mA 3 A 17 Ohms - 40 C + 85 C 5 mm Reel, Cut Tape
Littelfuse Resettable Fuses - PPTC .15A 250Vdc 3A RMS INTER
Datasheet
9,273In Stock
Min.: 1
Mult.: 1

TRF600 PCB Mount Radial 150 mA 250 VDC 300 mA 3 A 17 Ohms - 40 C + 85 C 5 mm Bulk
Littelfuse Resettable Fuses - PPTC Polyswitch 0.26A
Datasheet
3,409In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1,500

TS250 PCB Mount SMD/SMT 130 mA 60 VDC 260 mA 3 A 20 Ohms - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC Polyswitch 0.13A
Datasheet
18,405In Stock
3,600Expected 6/4/2026
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1,200

TSV250 PCB Mount SMD/SMT 130 mA 60 VDC 260 mA 3 A 12 Ohms - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC .12A 60VDC 250VRMS
Datasheet
1,238In Stock
Min.: 1
Mult.: 1

TRF250 PCB Mount Radial 120 mA 60 VDC 240 mA 3 A 16 Ohms - 40 C + 85 C 5 mm Bulk
Littelfuse Resettable Fuses - PPTC 16 Ohms 3 A 60 V - 40 C+ 85 C
Datasheet
575In Stock
Min.: 1
Mult.: 1

TRF250 PCB Mount Radial 120 mA 60 V 240 mA 3 A 16 Ohms - 40 C + 85 C 5 mm Bulk
Littelfuse Resettable Fuses - PPTC 16 Ohms 3 A 60 VDC - 40 C+ 85 C
Datasheet
507In Stock
Min.: 1
Mult.: 1

TRF250 PCB Mount Radial 120 mA 60 VDC 240 mA 3 A 16 Ohms - 40 C + 85 C 5 mm Bulk
Littelfuse Resettable Fuses - PPTC .15A 250Vdc 600Vrms
Datasheet
1,601In Stock
Min.: 1
Mult.: 1
Reel: 1,500

TRF600 PCB Mount Radial 150 mA 250 VDC 300 mA 3 A 17 Ohms - 40 C + 85 C 5 mm Reel, Cut Tape
Littelfuse Resettable Fuses - PPTC Polyswitch 0.26A
Datasheet
955In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1,500

TS250 PCB Mount SMD/SMT 130 mA 60 VDC 260 mA 3 A 20 Ohms - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC 60V 3A 9Ohms
Datasheet
298In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1,500

TS250 PCB Mount SMD/SMT 130 mA 60 VDC 260 mA 3 A 15 Ohms - 40 C + 85 C Reel, Cut Tape, MouseReel
Littelfuse Resettable Fuses - PPTC TRF250-120T-R1-B-0.5-0.125
Datasheet
Non-Stocked
Min.: 2,000
Mult.: 2,000

TRF250 PCB Mount Radial 120 mA 60 V 240 mA 3 A 16 Ohms - 40 C + 85 C
Littelfuse Resettable Fuses - PPTC Polyswitch 0.3A
Datasheet
Non-Stocked
Min.: 2,000
Mult.: 2,000

TRF600 PCB Mount Radial 150 mA 250 V 300 mA 17 Ohms - 40 C + 85 C Bulk
Littelfuse Resettable Fuses - PPTC 60V 3A 8Ohms
Datasheet
Non-Stocked Lead-Time 15 Weeks
Min.: 10,000
Mult.: 500

TRF250 PCB Mount Radial 120 mA 60 V 240 mA 3 A 8 Ohms - 40 C + 85 C 5 mm Bulk
Littelfuse Resettable Fuses - PPTC 60V 3A 8Ohms
Datasheet
Non-Stocked Lead-Time 15 Weeks
Min.: 10,000
Mult.: 500

TRF250 PCB Mount Radial 120 mA 60 V 240 mA 3 A 8 Ohms - 40 C + 85 C 5 mm Bulk
Littelfuse Resettable Fuses - PPTC .12A 250V
Datasheet
Non-Stocked Lead-Time 15 Weeks
Min.: 1
Mult.: 1
Reel: 1,500

TRF250 PCB Mount Radial 120 mA 60 VDC 240 mA 3 A 16 Ohms - 40 C + 85 C 5 mm Reel, Cut Tape
Littelfuse Resettable Fuses - PPTC 250V .12A-HD 3A MAX
Datasheet
Non-Stocked Lead-Time 15 Weeks
Min.: 1
Mult.: 1

TRF250 PCB Mount Radial 120 mA 60 VDC 240 mA 3 A 16 Ohms - 40 C + 85 C 5 mm Bulk
Littelfuse Resettable Fuses - PPTC .12A 60Vdc MAX 250Vrms
Datasheet
Non-Stocked Lead-Time 15 Weeks
Min.: 1
Mult.: 1

TRF250 PCB Mount Radial 120 mA 60 VDC 240 mA 3 A 16 Ohms - 40 C + 85 C 5 mm Bulk
Littelfuse Resettable Fuses - PPTC .12A 250V
Datasheet
Non-Stocked Lead-Time 15 Weeks
Min.: 1
Mult.: 1
Reel: 1,500

TRF250 PCB Mount Radial 120 mA 60 VDC 240 mA 3 A 16 Ohms - 40 C + 85 C 5 mm Reel, Cut Tape
Littelfuse Resettable Fuses - PPTC 60V 3A 10Ohms
Datasheet
Non-Stocked Lead-Time 15 Weeks
Min.: 1
Mult.: 1

TRF250 PCB Mount Radial 120 mA 60 V 240 mA 10 Ohms - 40 C + 85 C 5 mm Bulk
Littelfuse Resettable Fuses - PPTC 16 Ohms 3 A 60 V - 40 C+ 85 C
Datasheet
Non-Stocked Lead-Time 15 Weeks
Min.: 1
Mult.: 1

TRF250 PCB Mount Radial 120 mA 60 V 240 mA 3 A 16 Ohms - 40 C + 85 C 5 mm Bulk