RUE400-1

Ptc Resettable Fuses Overview

The Littelfuse RUE400-1 is a PolySwitch resettable fuse from the RUEF series, designed for radial PCB mounting. It features a maximum voltage rating of 30 VDC and a hold current of 4 A. The device trips at 8 A with a maximum trip time of 12.7 seconds. It has a maximum interrupting current (Imax) of 40 A and a typical resistance of 50 mOhms. Operating temperature ranges from -40°C to +85°C. Dimensions are 19.3 mm length, 14 mm width, and 3 mm height.

Ptc Resettable Fuses Feature Summary

• Provides automatic circuit protection against overcurrent conditions through polymeric positive temperature coefficient technology.
• Offers repeatable protection by resetting automatically after fault clearance without requiring replacement.
• Features radial lead termination for standard printed circuit board assembly processes.

Ptc Resettable Fuses Applications

• Consumer electronics circuit protection
• Portable computing devices
• Peripheral interface circuits

Ptc Resettable Fuses Procurement Notes

Verify component authenticity using official Littelfuse documentation. Confirm that the specific part number matches project requirements for voltage and current ratings. Check RoHS compliance status in the latest datasheet. Ensure storage conditions maintain component integrity prior to soldering.

Ptc Resettable Fuses Selection Notes

Select this component when a 30 VDC system requires a 4 A hold current with an 8 A trip threshold. Consider the 40 A Imax rating for fault tolerance. Evaluate thermal dissipation needs as the device dissipates power during normal operation. Compare physical dimensions against available PCB footprint space.

Ptc Resettable Fuses Part Context

This component belongs to the Littelfuse RUEF series of PolySwitch resettable fuses. These devices utilize polymeric PTC materials to provide reliable overcurrent protection. The series is widely used in electronic circuits where manual fuse replacement is impractical or undesirable.

Ptc Resettable Fuses Replacement Considerations

Public confirmed substitute part numbers include RUE400 and RUEF400K. Verify electrical parameters match before substitution. Ensure mechanical dimensions and lead spacing are compatible with existing layouts.