30R250UPR

Ptc Resettable Fuses Overview

The Littelfuse 30R250UPR is a PolySwitch resettable PTC fuse designed for overcurrent protection. It features a maximum voltage rating of 30 VDC and a hold current (Ih) of 2.50 A. The trip current (It) is specified at 5.0 A, with a maximum fault current rating of 40 A. Initial resistance (Ri) is typically 5 mOhms, while post-trip resistance (R1) reaches a maximum of 0.07 Ohms. Power dissipation (Pd) is 800 mW. The device operates within a temperature range of -40°C to +85°C and utilizes radial leads with a 5.1 mm spacing.

Ptc Resettable Fuses Feature Summary

• Provides reliable overcurrent protection by increasing resistance as it heats to limit current flow during fault conditions.
• Offers automatic reset functionality after the fault condition is removed and the device cools down.
• Designed for through-hole PCB mounting with radial leads for secure mechanical attachment.

Ptc Resettable Fuses Applications

• Protection of circuits, wiring harnesses, and PCB components in electronic systems.
• Overcurrent protection for automotive actuators, screens, and small motors.
• Defense against short circuits and overcharging in battery-powered applications.

Ptc Resettable Fuses Procurement Notes

Verify the specific suffix UPR indicates tape-and-reel packaging when sourcing. Confirm RoHS compliance status and agency approvals such as UL and TUV are required for the target application. Ensure the hold current and voltage ratings match the circuit design requirements before procurement.

Ptc Resettable Fuses Selection Notes

Select this component based on the 2.50 A hold current and 30 VDC maximum voltage rating. Consider the 40 A fault current capability and power dissipation limits. Verify that the radial lead form factor fits the PCB layout constraints and thermal environment requirements.

Ptc Resettable Fuses Part Context

This part belongs to the Littelfuse 30R series of PolySwitch resettable fuses. These devices are polymer PTC thermistors used for circuit protection. The series offers various hold currents and package options, including radial leads, to suit different assembly and protection needs.

Ptc Resettable Fuses Replacement Considerations

Compatible substitutes within the same series include parts with similar electrical ratings, such as 30R250UU for bulk packaging or other 30R variants with matching 2.5 A hold current and 30 VDC ratings.