LVR055K-2

Ptc Resettable Fuses Overview

The Littelfuse LVR055K-2 is a PolySwitch line-voltage-rated polymer PTC resettable fuse designed for overcurrent and overtemperature protection. It features a maximum operating voltage of 240 VAC (265 VAC internal) and a hold current of 550 mA. The device trips at 1.25 A with a maximum trip time of 26 seconds. It supports a maximum fault current of 7 A and exhibits an initial resistance minimum of 450 mOhms, rising to a maximum post-trip resistance of 1.45 Ohms. Operating temperatures range from -20°C to +85°C.

Ptc Resettable Fuses Feature Summary

• Provides resettable circuit protection against mechanical overloads, overheating, stall, and lost neutral conditions in line-voltage applications.
• Offers low resistance characteristics compatible with traditional fuse solutions while maintaining a compact radial-leaded form factor.
• Complies with RoHS and halogen-free standards for environmentally safe integration.

Ptc Resettable Fuses Applications

• Protection of electric motors in commercial appliances
• Transformer protection in home appliances
• Overcurrent safeguarding for line-voltage rated circuits

Ptc Resettable Fuses Procurement Notes

Verify the specific suffix K-2 corresponds to the required packaging configuration, such as tape and reel or cut tape, as indicated by distributor part numbers like LVR055K-2TR or LVR055K-2CT. Confirm that the 240V rating aligns with the target circuit's maximum voltage requirements. Ensure the 550mA hold current meets the operational load specifications without nuisance tripping during normal operation.

Ptc Resettable Fuses Selection Notes

Select this component when line-voltage protection is required for devices drawing up to 550 mA continuously. The 1.25 A trip current provides a safety margin above the hold current. Verify that the 7 A maximum fault current capability exceeds the potential short-circuit currents in the application. Consider the radial lead spacing and physical dimensions for PCB layout compatibility.

Ptc Resettable Fuses Part Context

This device belongs to the Littelfuse LVR series of PolySwitch line-voltage-rated resettable fuses. These components are engineered specifically for protecting equipment connected to 120 VAC/VDC and 240 VAC/VDC power lines. The series offers a broad range of radial-leaded options suitable for replacing traditional fuses in consumer and commercial electronics.

Ptc Resettable Fuses Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Consult manufacturer cross-reference guides for equivalent ratings.