RHEF400

Ptc Resettable Fuses Overview

The Littelfuse RHEF400 is a radial leaded PolySwitch resettable PPTC fuse designed for overcurrent protection. It features a holding current of 4 A and a trip current of 7.5 A, with a maximum voltage rating of 16 VDC. The device exhibits a maximum resistance of 60 mOhms and can withstand fault currents up to 100 A. It operates within a temperature range of -40°C to +125°C and utilizes a 5.8 mm lead spacing for PCB mounting.

Ptc Resettable Fuses Feature Summary

• Provides reliable overcurrent protection by raising internal resistance during thermal events
• Offers automatic circuit restoration after fault conditions are cleared
• Designed for compact PCB mounting with radial leads

Ptc Resettable Fuses Applications

• Protection of circuits, wiring harnesses, and PCB components
• Overcurrent safeguarding in power supply applications
• Telecom equipment circuit protection

Ptc Resettable Fuses Procurement Notes

Verify the specific voltage rating requirements against the 16 VDC specification before procurement. Confirm that the 4 A holding current aligns with the target circuit's operational limits. Ensure the 60 mOhms maximum resistance meets the design's voltage drop constraints. Check compatibility with the specified -40°C to +125°C operating temperature range for the intended environment.

Ptc Resettable Fuses Selection Notes

Select this component when a low-voltage, high-current resettable fuse is required for radial mounting. The 16 VDC rating distinguishes it from higher voltage variants like the RUEF series. Consider the 7.5 A trip threshold for circuits requiring rapid response to moderate overloads. The 100 A max fault current capability supports robust protection against short circuits.

Ptc Resettable Fuses Part Context

The RHEF400 belongs to the Littelfuse Rhef series of PolySwitch resettable fuses. This series focuses on providing cost-effective, space-saving overcurrent protection solutions. It complements other radial and surface-mount options within the broader PolySwitch portfolio, targeting applications where manual fuse replacement is impractical or undesirable.

Ptc Resettable Fuses Replacement Considerations

Direct substitutes may include other Littelfuse radial PPTCs with matching 4 A holding current and 16 VDC ratings. Verify physical dimensions and lead spacing compatibility. Higher voltage equivalents like the RUEF400K offer similar electrical characteristics but differ in voltage rating and package length.