MF-RM012/240-0

Overview

The Bourns MF-RM012/240-0 is a radial leaded polymeric positive temperature coefficient (PPTC) resettable fuse from the MF-RM series. It features a hold current of 120 mA and a trip current of 300 mA, with a maximum rated voltage of 240 VAC. The device handles a maximum fault current of 1.2 A and exhibits an initial resistance of 12 ohms. Designed for PCB mounting, it operates within a temperature range of -20°C to +85°C and has a lead spacing of 5.1 mm.

Feature Summary

• Provides automatic circuit protection by increasing resistance in response to overcurrent or overheating conditions.
• Offers resettable functionality that restores normal operation after the fault condition is removed and the device cools down.
• Constructed with a radial leaded package suitable for through-hole printed circuit board mounting.

Applications

• Overcurrent protection in consumer electronic devices
• Circuit safeguarding in industrial control systems
• Protection for telecommunications equipment interfaces

Procurement Notes

Verify the specific suffix codes against official Bourns documentation to confirm exact electrical ratings and packaging configurations. Ensure the selected variant matches the required voltage and current specifications for the target application. Confirm compliance with relevant safety standards and RoHS directives as stated in the manufacturer's datasheet before finalizing procurement orders.

Selection Notes

Select this component when designing circuits requiring resettable overcurrent protection for AC mains or high-voltage DC lines up to 240 VAC. Consider the 120 mA hold current and 300 mA trip threshold to ensure proper sensitivity for the protected load. Evaluate the thermal environment to ensure operation remains within the specified -20°C to +85°C range for reliable performance.

Part Context

This part belongs to the Bourns MF-RM series of resettable fuses, which are designed for general-purpose circuit protection. The series offers various current and voltage ratings to accommodate different circuit requirements. These components serve as alternatives to traditional one-time fuses, providing convenience and cost savings in applications where repeated overcurrent events may occur.

Replacement Considerations

Consult official Bourns substitution guides for verified equivalent parts. Ensure any replacement maintains identical voltage ratings, hold current, and physical footprint dimensions to guarantee compatibility with existing PCB layouts and circuit protection requirements.

FAQ

What is the difference between hold current and trip current for this fuse?

The hold current (120 mA) is the maximum current the device will allow without tripping under normal conditions. The trip current (300 mA) is the minimum current at which the device will switch to a high-resistance state to protect the circuit.

Is this component suitable for AC applications?

Yes, the MF-RM012/240-0 is rated for a maximum voltage of 240 VAC, making it suitable for alternating current circuit protection applications.