LVR040S

Ptc Resettable Fuses Overview

The Littelfuse LVR040S is a radial-leaded PolySwitch resettable PPTC fuse designed for line-voltage applications. It features a holding current of 400 mA and a trip current of 900 mA, with a maximum voltage rating of 240 VAC/VDC. The device has a maximum resistance of 1.9 Ohms and a rated fault current of 5.5 A. It operates within a temperature range of -20°C to +85°C and dissipates up to 2 W. Physical dimensions include a length of 19.5 mm, width of 11.5 mm, and height of 3.8 mm, with a lead spacing of 5.8 mm.

Ptc Resettable Fuses Feature Summary

• Provides overcurrent protection against mechanical overloads, overheating, and stall conditions in commercial and home appliances.
• Offers low resistance compatible sizing with traditional fuse solutions while maintaining line-voltage ratings.
• Utilizes polymeric positive temperature coefficient technology to raise resistance as it heats, limiting current flow during faults.

Ptc Resettable Fuses Applications

• Protection of electric motors in household appliances
• Transformer protection in commercial equipment
• Circuit safeguarding against lost neutral conditions

Ptc Resettable Fuses Procurement Notes

Verify the specific voltage rating requirements against the datasheet, as the LVR series includes both 120 VAC and 240 VAC variants. Confirm that the 240 VAC rating aligns with your system's maximum operating voltage. Ensure the radial lead pitch matches your PCB layout constraints. Check RoHS compliance status if required by your manufacturing standards.

Ptc Resettable Fuses Selection Notes

Select this component when protecting circuits from overcurrent surges and overtemperature faults at line voltages. The 400 mA holding current suits low-power motor or transformer loads. Consider the 5.5 A maximum fault current capability for potential surge scenarios. Verify thermal dissipation needs do not exceed the 2 W power rating under continuous operation.

Ptc Resettable Fuses Part Context

The LVR040S belongs to the LVR series of line-voltage-rated PolySwitch devices. This family provides broad coverage for radial-leaded resettable fuses in the industry. These components are specifically engineered to replace traditional fuses in applications requiring resettable protection for AC/DC line voltages up to 240 V.

Ptc Resettable Fuses Replacement Considerations

The part number alias 336638-000 may be used interchangeably with LVR040S. Verify physical dimensions and electrical parameters match before substitution. Ensure the replacement maintains the same 240 VAC rating and radial lead configuration.