MF-R400-AP-14

Overview

The MF-R400-AP-14 is a polymeric positive temperature coefficient (PPTC) resettable fuse manufactured by Bourns Inc. It features a radial leaded package designed for through-hole mounting. The component has a maximum voltage rating of 30V and a hold current of 4A. It supports a trip current of 8A and can withstand peak currents up to 40A. The device offers resistance values as low as 0.01 Ohm and operates with a thermal response time of approximately 2.5 seconds. Physical dimensions are 14.4mm x 3mm x 24.8mm.

Feature Summary

• Provides overcurrent protection through automatic reset functionality upon cooling
• Supports high peak currents for suppressing brief surges such as motor startup or capacitive inrush
• Utilizes a radial leaded package for reliable through-hole circuit board integration

Applications

• Protection against overcurrent conditions in electronic circuits
• Suppression of brief surges generated during motor startup
• Mitigation of capacitive inrush currents in power supply inputs

Procurement Notes

Verify the specific suffix AP-14 to confirm the axial/radial lead configuration and packaging type, as variations exist within the MF-R400 series. Ensure the operating environment does not exceed the 30V maximum voltage rating. Confirm that the 4A hold current aligns with the continuous load requirements of the target application to prevent nuisance tripping during normal operation.

Selection Notes

Select this component when a resettable fuse is required for low-voltage DC applications up to 30V. The 4A hold current makes it suitable for moderate current loads where temporary surge tolerance is necessary. Consider the physical size constraints due to the radial leaded form factor. Ensure the ambient temperature range allows for proper thermal cycling between trip and reset states for reliable long-term performance.

Part Context

This part belongs to the MF-R400 series of PTC resettable fuses from Bourns Inc. The series is designed for general-purpose overcurrent protection in consumer electronics and industrial equipment. The MF-R400 family provides a cost-effective alternative to traditional one-time fuses, offering repeated protection cycles without replacement after fault clearance.

Replacement Considerations

Direct substitutes include other MF-R400 variants with matching electrical ratings, such as MF-R400-0-14 or MF-R400-2-14, provided the lead configuration matches the PCB layout. Verify that any replacement maintains the 30V rating and 4A hold current specifications to ensure equivalent circuit protection levels.