MF-RM040/240-0

$0.88

Description：PTC RESET FUSE 240V 400MA RADIAL
Series：Multifuse®, MF-RM
Mfr：Bourns Inc.
Package：Bulk

SKU:dab66b7cfb56 Category: PTC Resettable Fuses Brand: Bourns Inc.

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Product introduction

Product Detailed Parameters

Description：PTC RESET FUSE 240V 400MA RADIAL
Series：Multifuse®, MF-RM
Mfr：Bourns Inc.
Package：Bulk
Type：Polymeric
Voltage - Max：240V (265V Int)
Current - Hold (Ih) (Max)：400 mA
Current - Trip (It)：900 mA
Current - Max：5.5 A
Time to Trip：24 s
Resistance - Initial (Ri) (Min)：600 mOhms
Resistance - Post Trip (R1) (Max)：1.9 Ohms
Operating Temperature：-20°C ~ 85°C
Grade：-
Qualification：-
Ratings：-
Mounting Type：Through Hole
Package / Case：Radial, Disc
Size / Dimension：0.453" L x 0.150" W (11.50mm x 3.80mm)
Height - Seated (Max)：0.823" (20.90mm)
Thickness (Max)：-
Lead Spacing：0.114" (2.90mm)

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MF-RM040/240-0

Overview

The Bourns MF-RM040/240-0 is a radial leaded polymeric positive temperature coefficient (PPTC) resettable fuse from the MF-RM series. It features a maximum voltage rating of 240 VAC and a hold current of 40 mA. The device trips at a current of 120 mA within 10 seconds. Maximum trip current is 400 mA, with a maximum resistance of 35 ohms. Operating temperature ranges from -20°C to +85°C. Dimensions are 8.3 mm in diameter and 12.9 mm in height.

Feature Summary

Provides automatic circuit protection against overcurrent conditions through self-resetting functionality.
Designed for PCB mounting with radial leads for standard through-hole integration.
Complies with RoHS standards for environmental safety.

Applications

Consumer electronics power supply circuits
Industrial instrumentation input protection
Telecommunications equipment line interfaces

Procurement Notes

Verify the specific suffix code matches the required electrical characteristics, as variations exist within the MF-RM family. Confirm package type and lead spacing align with PCB layout requirements. Check for updated compliance certifications such as UL or IEC before finalizing procurement specifications.

Selection Notes

Select this component when a low-current circuit requires resettable protection rated for 240 VAC applications. Ensure the operating environment stays within the specified -20°C to +85°C range. Compare hold and trip currents against the load profile to prevent nuisance tripping during normal operation.

Part Context

This part belongs to the Bourns MF-RM series of radial PPTC devices. These components serve as reusable alternatives to traditional fuses in low-voltage AC and DC circuits. The series offers various hold current options to suit different sensitivity levels while maintaining a compact form factor suitable for dense board layouts.

Replacement Considerations

Cross-reference with other MF-RM variants sharing the same 240VAC rating and similar hold current values. Verify that substitute parts maintain identical physical dimensions and lead configurations for direct replacement without PCB modification.