MF-RX250

Overview

The Bourns MF-RX250 is a polymer positive temperature coefficient (PPTC) resettable fuse designed for overcurrent protection. It belongs to the MF-RX series, characterized by radial leaded construction suitable for through-hole PCB mounting. The device functions as a self-healing circuit protector, automatically resetting after fault conditions clear. Key electrical parameters include a hold current of 2.50A and a trip current of 5.00A. It supports a maximum voltage of 72VDC and features a low initial resistance of approximately 0.05 ohms. The component operates within a standard temperature range and offers robust protection against short circuits and excessive current loads in electronic applications.

Feature Summary

• Provides automatic circuit protection that resets without manual intervention after fault clearance
• Utilizes polymer PTC technology for reliable overcurrent and short-circuit defense
• Features radial leaded package design compatible with standard through-hole assembly processes

Applications

• Overcurrent protection for high-reliability electronic equipment
• Surge protection in industrial transportation systems
• Circuit safeguarding in communication infrastructure
• Protection for consumer electronics requiring resettable fuses

Procurement Notes

Verify the specific suffix designation when ordering, as variants such as MF-RX250/72-AP exist with distinct voltage ratings or packaging configurations. Confirm the required hold current and maximum voltage align with the target application's electrical specifications. Ensure the radial leaded form factor matches the printed circuit board layout constraints. Cross-reference official datasheets to validate performance characteristics against system requirements before finalizing procurement.

Selection Notes

Select this component based on the required 2.50A hold current and 72VDC maximum voltage rating. Consider the radial leaded package for through-hole mounting needs where surface mount options are unsuitable. Evaluate the low resistance value for minimal power loss during normal operation. Assess the thermal environment to ensure the operating temperature range meets system demands. Compare alternative series members if higher current handling or different voltage ratings are necessary.

Part Context

The MF-RX250 is part of Bourns' extensive Multifuse family of polymeric resettable fuses. This series is engineered for broad circuit protection applications across various industries. The component complements other Bourns protection devices like gas discharge tubes and varistors in comprehensive surge protection schemes. It represents a cost-effective solution for replacing traditional fusible links in designs requiring serviceability and repeated fault tolerance.

Replacement Considerations

Direct substitutes include the MF-RX250/72-AP variant, which shares similar electrical characteristics but may differ in packaging or certification. Designers should verify that any replacement maintains the same hold current, trip current, and voltage ratings. Ensure the physical dimensions and lead spacing of the substitute component fit the existing footprint. Consult official cross-reference guides for approved alternatives.