MF-R900-0-003

Overview

The MF-R900-0-003 is a polymeric resettable fuse manufactured by Bourns Inc. It features a radial disc package with a lead spacing of 0.402 inches (10.20mm). The component has a maximum voltage rating of 30V and a hold current of 9A. Its trip current is specified at 18A, with a maximum surge current capacity of 40A. The device operates within a temperature range of -40°C to 85°C and exhibits a resistance of 10mOhm. It is designed for through-hole mounting and includes a time-to-trip specification of 20 seconds.

Feature Summary

• Polymeric construction provides automatic circuit protection that resets after fault clearance.
• Radial disc package facilitates standard through-hole PCB mounting configurations.
• High surge current capability supports transient overload events without permanent damage.

Applications

• Overcurrent protection in low-voltage electronic circuits
• Battery pack protection systems
• Consumer electronics power input stages

Procurement Notes

Verify the specific datasheet version for the MF-R900-0-003 to confirm RoHS compliance status, as sources indicate varying information regarding environmental directives. Ensure the supplier provides official Bourns documentation to validate the 30V rating and 9A hold current specifications against your design requirements. Cross-reference the lead spacing of 0.402 inches with your PCB footprint to guarantee mechanical compatibility.

Selection Notes

Select this component when a 30V maximum voltage and 9A continuous hold current are required for overcurrent protection. The 18A trip current and 40A maximum surge rating define the protection threshold and tolerance limits. Consider the -40°C to 85°C operating range for environmental suitability. The radial package and 10.20mm lead spacing dictate the physical layout constraints on the printed circuit board.

Part Context

This part belongs to Bourns' PTC Resettable Fuses series, which utilizes polymeric positive temperature coefficient technology. These components serve as self-resetting fuses, offering reusable protection compared to single-use traditional fuses. The series is designed for applications requiring reliable overcurrent protection in compact electronic devices.

Replacement Considerations

Consult official Bourns substitution guides for equivalent polymeric resettable fuses with matching 30V and 9A ratings. Verify that any substitute maintains the same radial package dimensions and 0.402-inch lead spacing to ensure direct PCB compatibility without redesign.

FAQ

What is the maximum surge current the MF-R900-0-003 can withstand?

The component can withstand a maximum surge current of 40A.

Does the MF-R900-0-003 require replacement after tripping?

No, it is a resettable fuse that automatically returns to a low-resistance state after the fault condition is removed and the device cools down.