RUEF300K

Ptc Resettable Fuses Overview

The Littelfuse RUEF300K is a PolySwitch radial-leaded PPTC resettable fuse designed for overcurrent protection. It features a 3 A hold current and a 6 A trip current at 25°C. The device supports a maximum voltage of 30 VDC and can interrupt up to 100 A. Initial resistance is typically 20 mΩ, with a maximum post-trip resistance of 80 mΩ. It operates within a temperature range of -40°C to +85°C and has a trip time of 10.8 seconds at the trip current.

Ptc Resettable Fuses Feature Summary

• Provides automatic circuit recovery after fault clearance without manual replacement
• Increases resistance significantly upon overheating to limit excessive current flow
• Compatible with standard high-volume electronics assembly processes

Ptc Resettable Fuses Applications

• Computer motherboards
• USB hubs, ports and peripherals
• Industrial controls
• Battery packs

Ptc Resettable Fuses Procurement Notes

Verify that the specific part number RUEF300K matches the required electrical parameters, particularly the 3 A hold current and 30 VDC rating. Confirm the radial leaded package style and pin spacing requirements for your PCB layout. Ensure compliance with RoHS standards if applicable to your manufacturing process. Cross-reference the datasheet for thermal derating curves relevant to your operating environment.

Ptc Resettable Fuses Selection Notes

Select this component when a resettable protection solution is needed for low-voltage DC circuits requiring up to 3 A continuous current. Consider the 10.8-second trip time for applications where transient surges must be tolerated before tripping occurs. Evaluate the 80 mΩ maximum resistance impact on power loss during normal operation. Compare against non-resettable fuses if permanent disconnection is preferred over recovery.

Ptc Resettable Fuses Part Context

The RUEF series represents a comprehensive line of PolySwitch radial-leaded devices from Littelfuse. These components balance voltage ratings up to 30V with hold currents ranging up to 9A. The RUEF300K specifically addresses applications needing robust overcurrent protection in compact form factors suitable for through-hole mounting on printed circuit boards.

Ptc Resettable Fuses Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation.