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. 647-8342
Mfr. Part No.MF-USMF005-2
BrandBourns
£0.211
Each (In a Pack of 10)
Units
- 30V 1.5s 0.05A 10 A 3.43mm 1.1mm 2.8mm Electroless Nickel Immersion Gold 2.8Ω 50Ω 0.6W -40°C +85°C
RS Stock No. 647-8156
Mfr. Part No.MF-MSMF050-2
BrandBourns
£0.223
Each (In a Pack of 10)
Units
1A 15V 0.15s 0.5A 100 A 4.73mm 0.85mm 3.41mm Electroless Nickel Immersion Gold 0.15Ω 0.8W -40°C +85°C
RS Stock No. 546-3030
Mfr. Part No.MICROSMD010F-2
BrandLittelfuse
£0.285
Each (In a Pack of 20)
Units
250mA 30V dc 1s 0.1A 10 A 3.43mm 0.85mm 2.8mm - 2.1Ω 15Ω 0.8W - +85°C
RS Stock No. 517-7105
Mfr. Part No.MINISMDC020F-2
BrandLittelfuse
£0.251
Each (In a Pack of 10)
Units
400mA 30V dc 0.02s 0.2A 10 A 4.73mm 0.89mm 3.41mm - 0.6Ω 3.3Ω 0.8W - +85°C
RS Stock No. 517-7111
Mfr. Part No.MINISMDC050F-2
BrandLittelfuse
£0.266
Each (In a Pack of 10)
Units
1A 24V dc 0.15s 0.5A 100 A 4.73mm 0.62mm 3.41mm - 0.15Ω 0.8W - +85°C
RS Stock No. 517-7240
Mfr. Part No.MICROSMD050F-2
BrandLittelfuse
£0.317
Each (In a Pack of 20)
Units
1A 13.2V dc 0.05s 0.5A 40 A 3.43mm 0.62mm 2.8mm - 0.25Ω 900mΩ 0.8W - +85°C
RS Stock No. 787-4268
Mfr. Part No.2920L050DR
BrandLittelfuse
£0.516
Each (In a Pack of 5)
Units
1A 60V dc 4s 0.5A 10 A 7.98mm 1.25mm 5.44mm Tin Plated Copper 0.35Ω 1.4Ω 1.5W -40°C +85°C
RS Stock No. 517-7054
Mfr. Part No.SMD100F-2
BrandLittelfuse
£0.36
Each (In a Pack of 10)
Units
2.2A 30V 0.5s 1.1A 40 A 7.98mm 3mm 5.44mm - 0.12Ω 480mΩ 1.7W - +85°C
RS Stock No. 517-7206
Mfr. Part No.MICROSMD005F-2
BrandLittelfuse
£0.285
Each (In a Pack of 20)
Units
150mA 30V dc 1.5s 0.05A 10 A 3.43mm 0.85mm 2.8mm - 3.6Ω 50Ω 1W - +85°C
RS Stock No. 787-4255
Mfr. Part No.1812L110/33MR
BrandLittelfuse
£0.323
Each (In a Pack of 10)
Units
1.95A 33V dc 0.5s 1.1A 20 A 4.73mm 2mm 3.41mm Tin Plated Copper 0.06Ω 200mΩ 0.8W -40°C +85°C
RS Stock No. 647-8241
Mfr. Part No.MF-NSMF012-2
BrandBourns
£0.244
Each (In a Pack of 10)
Units
- 30V 0.2s 0.12A 10 A 3.4mm 1.1mm 1.8mm Electroless Nickel Immersion Gold 1.35Ω 8.5Ω 0.4W -40°C +85°C
RS Stock No. 494-723
Mfr. Part No.ZEN056V130A24LS
BrandLittelfuse
£1.044
Each (In a Pack of 5)
Units
- 24V 0.1s 1.3A 3 A 4.15mm 2mm 4.15mm - 0.12Ω 160mΩ 0.7W -40°C +85°C
RS Stock No. 506-993
Mfr. Part No.NANOSMDC012F
BrandLittelfuse
£0.297
Each (In a Pack of 10)
Units
390mA 48V dc 0.2s 0.12A 10 A 3.4mm 1mm 1.8mm - 1.4Ω 6.5Ω 0.5W - +85°C
RS Stock No. 734-8882
Mfr. Part No.MF-MSMF020/60-2
BrandBourns
£0.247
Each (In a Bag of 10)
Units
- 30V 0.06s 0.20A 80 A - - - - 0.40Ω 0.8W 0°C +23°C
RS Stock No. 517-7032
Mfr. Part No.SMD050F-2
BrandLittelfuse
£0.36
Each (In a Pack of 10)
Units
1A 60V 4s 0.5A 10 A 7.98mm 3.18mm 5.44mm - 0.35Ω 1.4Ω 1.7W - +85°C
RS Stock No. 787-4274
Mfr. Part No.2016L030DR
BrandLittelfuse
£0.498
Each (In a Pack of 5)
Units
600mA 60V dc 3s 0.3A 20 A 5.44mm 1.25mm 4.43mm Tin Plated Copper 0.5Ω 2.3Ω 1.4W -40°C +85°C
RS Stock No. 647-7995
Mfr. Part No.MF-SMDF050-2
BrandBourns
£0.258
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. 647-8134
Mfr. Part No.MF-MSMF010-2
BrandBourns
£0.236
Each (In a Pack of 10)
Units
- 60V 1.5s 0.1A 40 A 4.73mm 1.1mm 3.41mm Electroless Nickel Immersion Gold 0.7Ω 15Ω 0.8W -40°C +85°C
RS Stock No. 517-7234
Mfr. Part No.MICROSMD035F-2
BrandLittelfuse
£0.346
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. 647-8178
Mfr. Part No.MF-MSMF030-2
BrandBourns
£0.221
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