Resettable Surface Mount Fuses

Resettable surface mount fuses are a reusable type of circuit protection device that is able to be mounted onto printed circuit boards. They trip when the current gets too high, but will function again when conditions return to an acceptable level.

How do resettable surface mount fuses work?

Resettable surface mount fuses form part of the circuit on a PCB (printed circuit board), allowing electrical current to flow through them. When a fault such as overcurrent is detected in the circuit, they are tripped, forcing a break in the circuit which prevents electricity from continuing to flow. This prevents any damage to the circuit or attached devices. Unlike non-resettable surface mount fuses, they can be used over and over, as they will reconnect the circuit when conditions return to normal.

Types of resettable surface mount fuses

Resettable surface mount fuses have a number of characteristics that can vary between models, including terminal material, voltage rating and their operating temperature range. They also come in various different sizes.


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Description Price Trip Current Voltage Rating Time to Trip Hold Current Maximum Current Length Height Width Terminal Material Minimum Resistance Maximum Resistance Power Dissipation Minimum Operating Temperature Maximum Operating Temperature
RS Stock No. 647-7995
Mfr. Part No.MF-SMDF050-2
BrandBourns
£0.249
Each (In a Pack of 10)
Units
1.2A 60V 3s 0.55A 10 A 5.44mm 1.09mm 4.93mm Electroless Nickel Immersion Gold 0.2Ω 0.9W -40°C +85°C
RS Stock No. 647-8178
Mfr. Part No.MF-MSMF030-2
BrandBourns
£0.227
Each (In a Pack of 10)
Units
- 30V 0.1s 0.3A 10 A 4.73mm 1.1mm 3.41mm Electroless Nickel Immersion Gold 0.3Ω 0.8W -40°C +85°C
RS Stock No. 517-7234
Mfr. Part No.MICROSMD035F-2
BrandLittelfuse
£0.231
Each (In a Pack of 20)
Units
750mA 6V dc 0.2s 0.35A 40 A 3.43mm 0.62mm 2.8mm - 0.32Ω 1.3Ω 0.8W - +85°C
RS Stock No. 787-4198
Mfr. Part No.1206L050YR
BrandLittelfuse
£0.213
Each (In a Pack of 10)
Units
1A 6V dc 0.1s 0.5A 100 A 3.4mm 0.75mm 1.8mm Tin Plated Copper 0.15Ω 700mΩ 0.6W -40°C +85°C
RS Stock No. 895-1640
Mfr. Part No.2920L200DR
BrandLittelfuse
£0.311
Each (In a Pack of 10)
Units
4A 15V dc 5s 2A 40 A 7.98mm 1.25mm 5.44mm Solder Plated Copper 0.05Ω 125mΩ 1.5W -40°C +85°C
RS Stock No. 787-4261
Mfr. Part No.2920L150DR
BrandLittelfuse
£0.32
Each (In a Pack of 5)
Units
3A 33V dc 2s 1.5A 40 A 7.98mm 1.25mm 5.44mm Tin Plated Copper 0.08Ω 230mΩ 1.5W -40°C +85°C
RS Stock No. 897-8967
Mfr. Part No.MF-MSMF250/16X-2
BrandBourns
£0.402
Each (In a Pack of 10)
Units
5A 16V 5s 2.5A 100 A 4.83mm 1.6mm 3.41mm Gold Plated Nickel 0.015Ω 100mΩ 1.2W -40°C +85°C
RS Stock No. 787-4259
Mfr. Part No.1812L075/33DR
BrandLittelfuse
£0.253
Each (In a Pack of 10)
Units
1.5A 33V dc 0.2s 0.75A 20 A 4.73mm 1.55mm 3.41mm Tin Plated Copper 0.11Ω 400mΩ 0.8W -40°C +85°C
RS Stock No. 647-8358
Mfr. Part No.MF-USMF010-2
BrandBourns
£0.259
Each (In a Pack of 10)
Units
- 30V 0.6s 0.1A 10 A 3.43mm 1.1mm 2.8mm Electroless Nickel Immersion Gold 0.8Ω 15Ω 0.6W -40°C +85°C
RS Stock No. 647-8027
Mfr. Part No.MF-SM050-2
BrandBourns
£0.244
Each (In a Pack of 10)
Units
1A 60V 4s 0.5A 40 A 7.98mm 3.18mm 5.44mm Tin Plated Brass 0.35Ω 1.4Ω 1.7W -40°C +85°C
RS Stock No. 647-8033
Mfr. Part No.MF-SM100-2
BrandBourns
£0.244
Each (In a Pack of 10)
Units
2.2A 30V 0.5s 1.1A 80 A 7.98mm 3mm 5.44mm Tin Plated Brass 0.12Ω 480mΩ 1.7W -40°C +85°C
RS Stock No. 138-679
Mfr. Part No.NANOSMDC050F/13.2-2
BrandLittelfuse
£0.257
Each (In a Pack of 10)
Units
1.1A 13.2V dc 0.1s 0.5A 100 A 3.4mm 0.74mm 1.8mm - 0.2Ω 750mΩ 0.8W - +85°C
RS Stock No. 506-937
Mfr. Part No.NANOSMDC020F
BrandLittelfuse
£0.189
Each (In a Pack of 10)
Units
420mA 24V dc 0.1s 0.2A 100 A 3.4mm 0.82mm 1.8mm - 0.65Ω 3.1Ω 0.6W - +85°C
RS Stock No. 647-8320
Mfr. Part No.MF-NSMF050-2
BrandBourns
£0.286
Each (In a Pack of 10)
Units
1A 13.2V 0.1s 0.5A 100 A 3.4mm 0.85mm 1.8mm Electroless Nickel Immersion Gold 0.15Ω 700mΩ 0.4W -40°C +85°C
RS Stock No. 817-1655
Mfr. Part No.MF-LSMF185/33X-2
BrandBourns
£0.387
Each (In a Pack of 10)
Units
3.7A 33V 2.5s 1.85A 40 A 7.98mm 1.6mm 5.44mm Electroless Nickel Immersion Gold 0.045Ω 150mΩ 1.5W -40°C +85°C
RS Stock No. 895-1631
Mfr. Part No.1812L050/30PR
BrandLittelfuse
£0.598
Each (In a Pack of 10)
Units
1A 30V dc 0.15s 0.5A 100 A 4.73mm 1mm 3.41mm Solder Plated Copper 0.15Ω 0.8W -40°C +85°C
RS Stock No. 647-8370
Mfr. Part No.MF-USMF020-2
BrandBourns
£0.285
Each (In a Pack of 10)
Units
- 30V 0.02s 0.2A 10 A 3.43mm 1.1mm 2.8mm Electroless Nickel Immersion Gold 0.4Ω 0.6W -40°C +85°C
RS Stock No. 878-4018
Mfr. Part No.1206L020YR
BrandLittelfuse
£1,132.45
1 Pack of 4000
Pack(s)
- 24V dc 0.1s 0.2A 100 A 3.4mm 0.75mm 1.8mm Solder Plated Copper 0.65Ω 2.6Ω 0.6W -40°C +85°C
RS Stock No. 517-7127
Mfr. Part No.MINISMDC075F-2
BrandLittelfuse
£0.164
Each (In a Pack of 10)
Units
1.5A 13.2V dc 0.2s 0.75A 100 A 4.73mm 0.62mm 3.41mm - 0.11Ω 450mΩ 1W - +85°C
RS Stock No. 895-1625
Mfr. Part No.1206L020YR
BrandLittelfuse
£0.194
Each (In a Pack of 10)
Units
- 24V dc 0.1s 0.2A 100 A 3.4mm 0.75mm 1.8mm Solder Plated Copper 0.65Ω 2.6Ω 0.6W -40°C +85°C
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