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Ⅰ.Overview of product

The MF-R050 is a polymeric PTC resettable fuse from Bourns Inc.’s Multifuse® MF-R series, designed for reliable circuit overcurrent and overheating protection with through-hole mounting.

Ⅱ.Core parameter

Category:Circuit Protection,PTC Resettable Fuses

Manufacturer:Bourns Inc.

Series:Multifuse®, MF-R

Packaging:Bulk

Part Status:Active

Type:Polymeric

Voltage - Max:60V

Current - Hold (Ih) (Max):500 mA

Current - Trip (It):1 A

Current - Max:40 A

Time to Trip:4 s

Resistance - Initial (Ri) (Min):410 mOhms

Resistance - Post Trip (R1) (Max):1.17 Ohms

Operating Temperature:-40°C ~ 85°C

Mounting Type:Through Hole

Package / Case:Radial, Disc

Size / Dimension:0.311" Dia x 0.122" T (7.90mm x 3.10mm)

Height - Seated (Max):0.539" (13.70mm)

Lead Spacing:0.201" (5.10mm)

Approval Agency:cURus, TUV

Ⅲ.Main characteristics

Self-resetting function:Automatically restores to normal operation after the fault (overcurrent/overheating) is eliminated, no need for manual replacement.

Polymeric material core:Ensures fast response to overcurrent (trips in 4 seconds) and stable performance across a wide temperature range (-40°C to 85°C).

Compact radial disc design:Small footprint (7.90mm x 3.10mm) and through-hole mounting enable easy integration into space-constrained circuits.

High safety compliance:Certified by cURus and TUV, meeting international safety standards for reliable use in various electronic devices.

Low initial resistance:Minimum 410 mOhms initial resistance minimizes power loss during normal operation.

Ⅳ.Application field

Power Bank Protection:Portable power banks (overcurrent safeguard for lithium-ion battery charging/discharging circuits)

USB-C Chargers:USB-C wall chargers (protect internal power conversion modules from overloads)

Smart Doorbells:Home smart doorbells (shield control boards from sudden current surges)

Car USB Ports:Car USB charging ports (defend vehicle electronics against current overloads)

Router Power Supplies:Wireless router power supplies (prevent damage from voltage spikes)

LED Strip Drivers:LED strip drivers (protect LED arrays from overheating-induced current increases)

Small Humidifiers:Household mini humidifiers (safeguard internal motor and control circuits)

Ⅴ.Summary

The MF-R050 is a compact, reliable resettable fuse ideal for precise circuit protection in consumer electronics, automotive accessories, and small appliances, combining self-resetting convenience with industry-certified safety.