MF-RX040/72-0-17

Overview

The Bourns MF-RX040/72-0-17 is a polymeric positive temperature coefficient (PPTC) resettable fuse from the Multifuse MF-RX/72 series. It features a radial leaded disc package designed for PCB mounting. The component has a hold current of 400 mA and a trip current of 800 mA, with a maximum voltage rating of 72 VDC. It offers a high fault current capacity of 40 A and maintains an initial resistance of 860 mOhms. The device operates within a temperature range of -40°C to +85°C and dissipates 550 mW of power.

Feature Summary

• Provides automatic circuit protection through reversible thermal switching action upon overcurrent conditions
• Utilizes a robust radial leaded disc construction suitable for standard printed circuit board assembly processes
• Delivers high fault current interruption capability to safeguard sensitive electronic components

Applications

• Overcurrent protection in portable consumer electronics
• Circuit safeguarding in automotive electronic modules
• Protection for battery packs and charging circuits
• Industrial control system interface protection

Procurement Notes

Verify the specific suffix designation against the manufacturer's official documentation to confirm compliance with required safety certifications and regional regulatory standards. Ensure that the selected variant matches the precise electrical ratings necessary for the target application environment. Cross-reference the datasheet parameters to validate compatibility with existing design specifications before finalizing procurement orders.

Selection Notes

Select this component when the application requires a 72 VDC rated PTC fuse with a 400 mA hold current. The radial leaded form factor is appropriate for through-hole mounting configurations. Consider the 860 mOhms resistance value for potential voltage drop analysis within the circuit design. Evaluate the thermal dissipation requirements to ensure adequate heat management during normal operation.

Part Context

This part belongs to the Bourns Multifuse MF-RX/72 series, which specializes in polymeric resettable fuses for general-purpose circuit protection. The series provides reliable overcurrent defense across various industrial and commercial applications. The specific model integrates standard radial leads for easy integration into legacy and modern PCB layouts.

Replacement Considerations

The MF-RX040/72-0 serves as a direct functional equivalent within the same product family. Verify dimensional tolerances and lead spacing compatibility when substituting components to ensure proper mechanical fit on the printed circuit board.