LR4-550F is out of stock and can be placed on backorder.
Available Substitutes:

Direct


Bourns Inc.
In Stock: 0
Unit Price: $1.05000
Datasheet

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Bourns Inc.
In Stock: 0
Unit Price: $1.81000
Datasheet

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Bourns Inc.
In Stock: 0
Unit Price: $2.15000
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Bel Fuse Inc.
In Stock: 0
Unit Price: $0.79000
Datasheet
Polymeric PTC Resettable Fuse 20V 5.5 A Ih User Defined Strap
Image shown is a representation only. Exact specifications should be obtained from the product data sheet.
Polymeric PTC Resettable Fuse 20V 5.5 A Ih User Defined Strap
Building Automation – Protect/Sense/Control
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LR4-550F

DigiKey Part Number
LR4-550F-ND
Manufacturer
Manufacturer Product Number
LR4-550F
Description
PTC RESET FUSE 20V 5.5A STRAP
Manufacturer Standard Lead Time
15 Weeks
Customer Reference
Detailed Description
Polymeric PTC Resettable Fuse 20V 5.5 A Ih User Defined Strap
Datasheet
 Datasheet
Product Attributes
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Category
Time to Trip
5 s
Manufacturer
Littelfuse Inc.
Resistance - Initial (Ri) (Min)
9 mOhms
Series
Resistance - Post Trip (R1) (Max)
22 mOhms
Packaging
Bag
Operating Temperature
-40°C ~ 85°C
Part Status
Active
Mounting Type
User Defined
Type
Polymeric
Package / Case
Strap
Voltage - Max
20V
Size / Dimension
1.417" L x 0.283" W (36.00mm x 7.20mm)
Current - Hold (Ih) (Max)
5.5 A
Thickness (Max)
0.039" (1.00mm)
Current - Trip (It)
10.5 A
Approval Agency
CSA, TUV, UL
Current - Max
100 A
Environmental & Export Classifications
Product Questions and Answers
Additional Resources
Substitutes (4)
Part NumberManufacturerQuantity AvailableDigiKey Part NumberUnit PriceSubstitute Type
MF-LR550Bourns Inc.0MF-LR550-ND$1.05000Direct
MF-LR730/20-0Bourns Inc.0118-MF-LR730/20-0-ND$1.81000Similar
MF-LR900/20-0Bourns Inc.0MF-LR900/20-0-ND$2.15000Similar
0ZSC0550FF1EBel Fuse Inc.05923-0ZSC0550FF1E-ND$0.79000Similar
In-Stock: 0
1,000 estimated in stock on 09-Mar-2027
Request Stock Notification
All prices are in USD
Bag
QuantityUnit PriceExt Price
1$1.21000$1.21
5$1.00200$5.01
10$0.92400$9.24
50$0.76700$38.35
100$0.70760$70.76
250$0.63596$158.99
500$0.58642$293.21
1,000$0.54052$540.52
5,000$0.47750$2,387.50
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