MF-RM055/240-0

Overview

The Bourns MF-RM055/240-0 is a radial leaded polymeric self-resetting fuse from the MF-RM series, designed for overcurrent protection in electronic circuits. It features a maximum voltage rating of 240V AC and a hold current of 0.055A. The device trips at 120mA within 10 seconds under standard conditions. It operates within a temperature range of -20°C to 85°C and consumes up to 0.9W of power. The component has a minimum resistance of 18.5Ω and a maximum resistance of 65Ω, with leads measuring 0.51mm in diameter.

Feature Summary

• Provides automatic circuit recovery after fault clearance without manual replacement
• Offers dual UL and RoHS compliance for global regulatory adherence
• Utilizes polymeric positive temperature coefficient technology for reliable thermal response

Applications

• Consumer electronics power supply input protection
• Telecommunications equipment line interface circuits
• Industrial control board overcurrent safeguarding

Procurement Notes

Verify that the specific part number matches the required hold and trip currents for the target application circuit. Confirm that the axial or radial lead configuration aligns with the PCB layout requirements. Ensure the operating temperature range covers the environmental extremes of the final assembly. Check for any specific packaging quantity restrictions imposed by the supplier.

Selection Notes

Select this component when a low-current, high-voltage resettable fuse is required for AC mains or signal lines. Compare the hold current against the normal operating current to ensure stability during transients. Evaluate the trip time characteristics against the sensitivity of downstream components. Consider the physical dimensions for space-constrained designs within the MF-RM family.

Part Context

This device belongs to the Bourns MF-RM series of multifuse circuit protection components. The series provides a range of current ratings for various electronic applications. These fuses serve as alternatives to traditional fusible resistors, offering repeated use after overload events. The product line emphasizes compact sizing and robust performance in consumer and industrial markets.

Replacement Considerations

Direct substitutes include other Bourns MF-RM variants with matching electrical ratings. Cross-reference with equivalent PTC fuses from manufacturers like Littelfuse or EPCOS if supply constraints exist. Verify that any replacement maintains the same voltage rating and package style to fit existing footprints.