MF-RX040/72-0

$0.68

Description：PTC RESET FUSE 72V 400MA RADIAL
Series：Multifuse®, MF-RX/72
Mfr：Bourns Inc.
Package：Bulk

SKU:3a433997046b Category: PTC Resettable Fuses Brand: Bourns Inc.

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Product introduction

Product Detailed Parameters

Description：PTC RESET FUSE 72V 400MA RADIAL
Series：Multifuse®, MF-RX/72
Mfr：Bourns Inc.
Package：Bulk
Type：Polymeric
Voltage - Max：72V
Current - Hold (Ih) (Max)：400 mA
Current - Trip (It)：800 mA
Current - Max：40 A
Time to Trip：3.9 s
Resistance - Initial (Ri) (Min)：520 mOhms
Resistance - Post Trip (R1) (Max)：1.29 Ohms
Operating Temperature：-40°C ~ 85°C
Grade：-
Qualification：-
Ratings：-
Mounting Type：Through Hole
Package / Case：Radial, Disc
Size / Dimension：0.291" Dia x 0.122" T (7.40mm x 3.10mm)
Height - Seated (Max)：0.539" (13.70mm)
Thickness (Max)：-
Lead Spacing：0.201" (5.10mm)

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MF-RX040/72-0

Overview

The Bourns MF-RX040/72-0 is a radial leaded polymeric positive temperature coefficient (PPTC) resettable fuse from the Multifuse MF-RX/72 series. It features a holding current of 400 mA and a trip current of 800 mA, with a maximum voltage rating of 72 VDC. The device has a maximum rated current of 40 A and an initial resistance of 860 mOhms. It operates within a temperature range of -40°C to +85°C and dissipates 550 mW. Physical dimensions include a length of 13.7 mm, width of 3.1 mm, height of 3.1 mm, and diameter of 7.4 mm, with a lead spacing of 5.1 mm.

Feature Summary

Provides automatic circuit protection through reversible thermal response to overcurrent conditions
Eliminates the need for manual replacement after fault clearance by resetting automatically upon cooling

Applications

LED driver applications
Current control circuits
Overheat protection systems
Surge and electrostatic discharge mitigation

Procurement Notes

Verify component authenticity by cross-referencing the manufacturer part number MF-RX040/72-0 with official Bourns documentation. Confirm that the received items match the specified radial leaded package and Multifuse branding. Ensure compliance with RoHS requirements as indicated in the product specifications. Validate electrical parameters against the datasheet prior to integration into production assemblies.

Selection Notes

Select this component when circuit protection requires a 400 mA holding current and 72 VDC maximum voltage rating. The radial leaded configuration suits PCB mounting applications requiring 5.1 mm lead spacing. Consider the 860 mOhms resistance and 550 mW power dissipation for thermal management planning. The -40°C to +85°C operating range defines environmental suitability limits.

Part Context

This part belongs to the Bourns Multifuse MF-RX/72 series of PTC resettable fuses. The series offers various current ratings within a consistent 72 VDC voltage class. The MF-RX040/72-0 specifically addresses low-current protection needs with its 400 mA holding specification, distinguishing it from higher-rated variants like the MF-RX030 or MF-RX110 models.