LVR040S-2

Ptc Resettable Fuses Overview

The Littelfuse LVR040S-2 is a PolySwitch resettable PPTC fuse rated for line voltages of 120 VAC/VDC and 240 VAC. It features a hold current of 400 mA and a trip current of 900 mA, with a maximum interrupting rating of 20 A. The device operates within a temperature range of -40°C to +85°C and has a typical resistance of 1.9 Ohms. It utilizes radial leads with a 5.8 mm spacing and measures 19.5 mm in length, 11.5 mm in width, and 3.8 mm in height.

Ptc Resettable Fuses Feature Summary

• Provides overcurrent protection against mechanical overloads, overheating, stall, and lost neutral conditions in commercial and home appliances.
• Offers low resistance and compact sizing compatible with traditional fuse solutions while maintaining line-voltage ratings.
• Constructed as a polymeric positive temperature coefficient device that automatically resets after fault clearance.

Ptc Resettable Fuses Applications

• Protection of electric motors in household appliances
• Transformer circuit protection in consumer electronics
• Overcurrent safeguarding for AC/DC power adapters

Ptc Resettable Fuses Procurement Notes

Verify the specific suffix 'S' against the official Littelfuse datasheet to confirm lead configuration and packaging type. Ensure the voltage rating aligns with the target circuit's maximum operating voltage. Confirm RoHS compliance status through the manufacturer's documentation before integration into regulated assemblies.

Ptc Resettable Fuses Selection Notes

Select this component when line-voltage protection is required for circuits drawing up to 400 mA continuously. The radial lead style suits through-hole PCB mounting. Evaluate thermal derating requirements at elevated ambient temperatures above 20°C to ensure reliable operation within the specified -40°C to +85°C range.

Ptc Resettable Fuses Part Context

This part belongs to the LVR series of line-voltage-rated PolySwitch devices from Littelfuse. The series is designed specifically for protecting equipment connected to mains power lines, offering a resettable alternative to one-time fuses in high-voltage applications.

Ptc Resettable Fuses Replacement Considerations

Consult Littelfuse documentation for direct cross-references. Verify that any substitute maintains identical hold current, trip current, and maximum voltage ratings to ensure circuit safety and compliance.