72R135XF

Ptc Resettable Fuses Overview

The Littelfuse 72R135XF is a PolySwitch radial leaded resettable PTC fuse designed for PCB mounting. It features a 72 VDC maximum voltage rating and a 1.35 A hold current. The device trips at 2.7 A and supports a maximum fault current of 40 A. Its initial resistance is 300 mOhms, with a power dissipation of 1.7 W. Operating temperatures range from -40°C to +85°C. The component has a disk package with a diameter of 13.58 mm and a length of 3.1 mm.

Ptc Resettable Fuses Feature Summary

• Provides reliable overcurrent protection through automatic resistance increase during fault conditions
• Offers reusable circuit safeguarding without requiring manual replacement after tripping
• Features radial leads for secure through-hole printed circuit board integration

Ptc Resettable Fuses Applications

• Protection of telecommunications equipment circuits
• Safeguarding power supply input lines
• Overcurrent defense for automotive electronic subsystems

Ptc Resettable Fuses Procurement Notes

Verify the specific suffix configuration against the official Littelfuse datasheet to ensure correct voltage and current ratings. Confirm RoHS compliance status and packaging type requirements prior to ordering. Cross-reference the manufacturer part number with authorized distributor catalogs to validate authenticity and technical specifications.

Ptc Resettable Fuses Selection Notes

Select this component when a 72 VDC system requires a resettable protection mechanism with a 1.35 A nominal operating current. Ensure the application environment stays within the specified -40°C to +85°C temperature range. Verify that the 300 mOhms initial resistance aligns with the circuit's voltage drop constraints and that the 40 A interrupt rating exceeds potential fault currents.

Ptc Resettable Fuses Part Context

This device belongs to the Littelfuse 72R series of PolySwitch resettable fuses. These components utilize polymer positive temperature coefficient technology to provide solid-state circuit protection. The series is engineered for applications requiring durable, non-latching overcurrent defense in compact form factors suitable for standard manufacturing processes.

Ptc Resettable Fuses Replacement Considerations

Consult the official Littelfuse selection guide for verified cross-references. Ensure any substitute maintains identical voltage, current, and physical dimensions.