MF-RX300-AP-99

Overview

The Bourns MF-RX300-AP-99 is a resettable fuse from the MF-RX series, designed for overcurrent protection in electronic circuits. It features a polymeric positive temperature coefficient (PPTC) construction that provides automatic reset functionality after fault conditions clear. The component utilizes an axial leaded package configuration, facilitating through-hole mounting on printed circuit boards. This device serves as a reliable alternative to traditional one-time fuses, offering sustained protection against excessive current flow while maintaining low resistance during normal operation.

Feature Summary

• Provides automatic reset capability following overcurrent event clearance
• Utilizes polymeric positive temperature coefficient technology for thermal response
• Offers durable axial leaded package suitable for through-hole assembly

Applications

• Consumer electronics circuit protection
• Industrial equipment overcurrent safeguarding
• Telecommunications hardware safety

Procurement Notes

Verify specific electrical parameters such as hold current, trip current, and voltage rating against application requirements before procurement. Confirm package style and lead form match the target PCB layout. Ensure compliance with relevant environmental directives if required by the end product specifications. Cross-reference datasheet values with actual operating conditions to guarantee adequate margin.

Selection Notes

Select this component based on the maximum operating current and peak fault current of the protected circuit. Consider the ambient temperature range to ensure proper tripping characteristics are maintained. Evaluate the physical space constraints for the axial leaded footprint. Compare performance against standard fuses to determine if resettable functionality offers long-term cost benefits for the specific application scenario.

Part Context

This part belongs to the MF-RX series of resettable fuses manufactured by Bourns Inc. The series is characterized by its use of PPTC materials to provide reversible overcurrent protection. These devices are widely utilized across various industries where maintenance access is difficult or frequent fuse replacement is undesirable. The axial leaded format distinguishes it from surface mount alternatives within the broader product portfolio.

Replacement Considerations

Consult official substitution guides for equivalent resettable fuses with matching electrical ratings. Verify that any substitute component maintains the same package dimensions and lead spacing to ensure mechanical compatibility. Check for updated versions or revised series designations that may offer improved performance or availability.