MF-RX075/72-0

Overview

The Bourns MF-RX075/72-0 is a radial leaded polymeric positive temperature coefficient (PPTC) resettable fuse from the MF-RX/72 series. It features a maximum voltage rating of 72 VDC and a hold current of 0.75 A. The trip current is specified at 1.5 A, with a maximum trip time of 6.3 seconds under rated conditions. The device has a minimum resistance of 0.18 Ohms and a maximum resistance of 0.9 Ohms. It supports a maximum fault current of 40 A and dissipates up to 0.9 W. Operating temperatures range from -40°C to +85°C.

Feature Summary

• Provides automatic circuit protection through reversible thermal switching action upon overcurrent events
• Eliminates the need for manual replacement after fault clearance by resetting automatically upon cooling
• Designed for through-hole PCB mounting with radial leads for secure mechanical attachment

Applications

• Overcurrent protection in portable electronic devices
• Protection circuits in automotive electronics systems
• Industrial control equipment power supply lines
• Battery pack protection modules

Procurement Notes

Verify the specific part number suffix against official Bourns documentation to confirm exact electrical characteristics and packaging configuration. Ensure that the selected component meets the required voltage and current ratings for the target application circuit. Confirm compliance with relevant safety standards such as UL or RoHS if mandated by the end product specifications.

Selection Notes

Select this component based on the 72 VDC voltage limit and 0.75 A hold current requirements. Evaluate the thermal environment to ensure operation within the -40°C to +85°C range. Consider the physical dimensions and lead spacing for PCB layout compatibility. Assess the maximum fault current capability of 40 A to ensure adequate protection during short-circuit conditions.

Part Context

This component belongs to the Bourns MF-RX/72 series of PTC resettable fuses. The series offers various hold current options within a 72 VDC system. These devices are engineered for compact circuit protection applications where space constraints and reliable automatic reset functionality are critical design factors.

Replacement Considerations

Consult official Bourns substitution guides for compatible alternatives. Verify that any substitute maintains identical voltage ratings, hold current, and package dimensions to ensure direct fitment without redesigning the host circuit board.