MF-RX050/72-AP-17

Overview

The Bourns MF-RX050/72-AP-17 is a polymeric positive temperature coefficient (PPTC) resettable fuse from the Multifuse MF-RX/72 series. It features a radial leaded package designed for PCB mounting. The component has a maximum voltage rating of 72 VDC and a hold current of 500 mA. Its trip current is specified at 1 A, with a maximum fault current rating of 40 A. The device operates within a temperature range of -40°C to +85°C. The specific suffix indicates an ammo pack packaging configuration.

Feature Summary

• Provides overcurrent protection through automatic resistance increase during fault conditions
• Offers repeated reset capability after cooling without requiring replacement
• Utilizes a radial leaded form factor suitable for through-hole PCB integration

Applications

• Battery pack protection in portable electronic devices
• Overcurrent safeguarding for peripheral interfaces such as USB ports
• Protection circuits for automotive electronics operating within specified thermal limits

Procurement Notes

Verify the exact part number against manufacturer documentation to confirm the specific packaging suffix and lead configuration. Ensure that the application environment remains within the stated operational temperature range of -40°C to +85°C. Confirm that the circuit's normal operating current does not exceed the 500 mA hold current specification to prevent nuisance tripping during standard operation.

Selection Notes

Select this component when a 72 VDC system requires resettable protection for loads up to 500 mA. Consider the physical dimensions and lead spacing to ensure compatibility with the printed circuit board layout. Evaluate the thermal environment to guarantee reliable performance across the full industrial temperature spectrum defined by the manufacturer specifications.

Part Context

This device belongs to the Bourns Multifuse MF-RX/72 family of PTC resettable fuses. These components are engineered for compact electronic applications where space constraints and repeated fault recovery are critical. The series provides a cost-effective alternative to traditional one-time fuses in consumer, industrial, and automotive sectors.

Replacement Considerations

Direct substitutes include other MF-RX050/72 variants with different packaging options, such as bulk or reel configurations. Cross-reference technical parameters like hold current, trip current, and maximum voltage before substituting with generic PTC components to ensure electrical compatibility.