MF-RX300-AP

Overview

The Bourns MF-RX300-AP is a PTC resettable fuse from the Multifuse MF-RX/72 series, designed for overcurrent protection in electronic circuits. It features a hold current of 3.0 A and a trip current of 6.0 A at ambient conditions. The device supports a maximum voltage of 72 VDC and can withstand fault currents up to 40 A max. With a typical resistance of 60 mOhms, it operates within a temperature range of -40°C to +85°C. The component utilizes radial leads with a 10.2 mm spacing and is supplied in bulk packaging.

Feature Summary

• Provides automatic circuit recovery after fault clearance without manual replacement
• Offers dual UL and CSA agency approvals for safety compliance
• Utilizes polymer PTC technology for reliable thermal response

Applications

• Overcurrent protection for portable computing devices
• Surge suppression in peripheral equipment interfaces
• Circuit safeguarding in battery-powered consumer electronics

Procurement Notes

Verify that the specific suffix '-AP' corresponds to the intended bulk packaging configuration as defined by Bourns documentation. Confirm that the lead spacing and physical dimensions match the PCB footprint requirements. Ensure the operating temperature range aligns with the final assembly environment specifications before procurement.

Selection Notes

Select this component when a 3.0 A hold current and 72 VDC rating are required for radial mounting applications. Consider the 60 mOhms impedance for low-power loss scenarios. Evaluate the 40 A maximum fault current capability against potential surge conditions in the target circuit design to ensure adequate protection margins.

Part Context

This part belongs to the Multifuse MF-RX/72 family, which provides general-purpose overcurrent protection. The series is characterized by radial leaded construction suitable for through-hole PCB mounting. These devices serve as reusable alternatives to traditional one-time fuses in various commercial and industrial electronic systems.

Replacement Considerations

The MF-RX300/72-0 is a verified substitute offering identical electrical ratings including 3.0 A hold current and 72 VDC maximum voltage. Verify that the packaging difference between AP and standard suffixes does not impact automated assembly processes.