72R040XPR

Ptc Resettable Fuses Overview

The Littelfuse 72R040XPR is a PolySwitch resettable PTC fuse designed for overcurrent protection. It features a maximum voltage rating of 72 VDC and a hold current of 400 mA, with a trip current of 800 mA. The device has a maximum resistance of 1.29 Ohms and a power dissipation of 560 mW. It operates within a temperature range of -40°C to +85°C. The component utilizes a radial leaded package with a 5.1 mm lead spacing and measures 7.6 mm in diameter by 3.1 mm in height. It carries cURus and TUV certifications.

Ptc Resettable Fuses Feature Summary

• Provides reliable overcurrent protection through automatic resistance increase upon heating
• Offers reusable circuit protection without requiring manual replacement after fault events
• Features compact radial-leaded form factor suitable for PCB mounting

Ptc Resettable Fuses Applications

• Circuit protection for wiring harnesses
• Protection for PCB components against overcurrent events
• Overcurrent safeguarding for telephony and networking equipment

Ptc Resettable Fuses Procurement Notes

Verify the specific ordering suffix to confirm packaging configuration, as designations such as CT or TB indicate distinct shipping formats like cut tape or tape and reel. Ensure compliance with RoHS3 standards and confirm that the required agency approvals align with target market regulations before finalizing procurement orders.

Ptc Resettable Fuses Selection Notes

Select this component when a 72 VDC maximum voltage rating and 400 mA hold current are required for circuit protection. Consider the 1.29 Ohms maximum resistance and 560 mW power dissipation limits during thermal analysis. Verify that the radial leaded package dimensions fit the available PCB footprint and that the operating temperature range meets environmental requirements.

Ptc Resettable Fuses Part Context

This part belongs to the POLY-FUSE 72R series of resettable fuses manufactured by Littelfuse Inc. The series provides solid-state protection solutions using polymeric positive temperature coefficient technology. These devices are engineered to replace traditional fusible links in various electronic applications, offering a reusable alternative for safeguarding circuits from excessive current conditions.

Ptc Resettable Fuses Replacement Considerations

Publicly confirmed parameter-equivalent substitutes include RXEF040, RXEF040-2, RXEF040S, and RXEF040S-2 from Littelfuse Inc.