72R185XMR

Ptc Resettable Fuses Overview

The Littelfuse 72R185XMR is a PolySwitch radial leaded PPTC resettable fuse designed for overcurrent protection. It features a maximum voltage rating of 72 VDC and a hold current of 1.85 A. The device trips at 3.7 A and supports a maximum fault current of 40 A. Initial resistance is 190 mOhms, with an operating temperature range from -40°C to +85°C. The component utilizes a radial package with a 5.1 mm lead spacing.

Ptc Resettable Fuses Feature Summary

• Provides reliable overcurrent protection for circuits, wiring harnesses, and PCB components
• Increases resistance upon heating to limit current flow during fault conditions
• Offers automatic recovery after the fault condition is removed and the device cools

Ptc Resettable Fuses Applications

• Protection for automotive actuators and small motors
• Overcurrent safeguarding for telephony and networking equipment
• Circuit protection in general power supply applications

Ptc Resettable Fuses Procurement Notes

Verify the specific suffix XMR indicates the Ammo Pack packaging configuration as documented. Confirm that the 72VDC rating aligns with your system's maximum operating voltage requirements. Ensure the 1.85A hold current meets the circuit's normal operational load without nuisance tripping. Check for any RoHS compliance documentation updates prior to final integration.

Ptc Resettable Fuses Selection Notes

Select this component when a radial leaded form factor is required for through-hole mounting. The 72VDC rating suits low-voltage DC systems. The 1.85A hold current provides a balance between sensitivity and tolerance for normal surge currents. Consider the 5.1mm lead spacing for standard PCB layout compatibility.

Ptc Resettable Fuses Part Context

This part belongs to the Littelfuse 72R series of PolySwitch resettable fuses. These devices are solid-state polymer PTC thermistors used for reusable circuit protection. The series offers various hold currents and voltage ratings to accommodate diverse electronic design needs across multiple industries.

Ptc Resettable Fuses Replacement Considerations

The RXEF185K-AP is a confirmed substitute within the same manufacturer lineup. Verify that the replacement maintains the required 72VDC rating and 1.85A hold current specifications.