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. 517-7105
Mfr. Part No.MINISMDC020F-2
BrandLittelfuse
HK$3.062
Each (In a Pack of 10)
units
400mA 30 V dc 0.02s 0.2 A 10 A 4.73mm 0.89mm 3.41mm - 0.6Ω 3.3Ω 0.8W - +85°C
RS Stock No. 647-8156
Mfr. Part No.MF-MSMF050-2
BrandBourns
HK$2.413
Each (In a Pack of 10)
units
1A 15 V 0.15s 0.5 A 100 A 4.73mm 0.85mm 3.41mm Electroless Nickel Immersion Gold 0.15Ω 0.8W -40°C +85°C
RS Stock No. 624-3152
Mfr. Part No.NANOSMDC075F-2
BrandLittelfuse
HK$3.097
Each (In a Pack of 10)
units
1.5A 6 V dc 0.1s 0.75 A 100 A 3.4mm 0.68mm 1.8mm - 0.09Ω 300mΩ 0.8W - +85°C
RS Stock No. 517-7098
Mfr. Part No.SMD250F-2
BrandLittelfuse
HK$4.066
Each (In a Pack of 10)
units
5A 15 V 25s 2.5 A 40 A 9.4mm 3mm 6.71mm - 0.035Ω 85mΩ 1.9W - +85°C
RS Stock No. 817-1668
Mfr. Part No.MF-MSMF110/24X-2
BrandBourns
HK$3.027
Each (In a Pack of 10)
units
2.2A 24 V 0.5s 1.1 A 20 A 4.83mm 1.6mm 3.41mm Electroless Nickel Immersion Gold 0.06Ω 180mΩ 0.8W -40°C +85°C
RS Stock No. 867-5261
Mfr. Part No.MINISMDC075F/24-2
BrandLittelfuse
HK$3.857
Each (In a Bag of 10)
units
1.5A 24 V dc 0.3s 0.75 A 40 A 3.41mm 4.83mm 1.46mm Tin 0.09Ω 290mΩ 0.8W -40°C +85°C
RS Stock No. 162-2532
Mfr. Part No.MF-SM185/33-2
BrandBourns
HK$2.657
Each (On a Reel of 1500)
units
3.6A 33 V 5s 1.8 A 40 A 9.5mm 3mm 6.71mm Tin Plated Brass 0.04Ω 150mΩ 1.9W -40°C +85°C
RS Stock No. 167-4517
Mfr. Part No.MF-FSMF020X-2
BrandBourns
HK$2.955
Each (On a Reel of 6000)
units
500mA 9 V 0.6s 0.2 A 40 A 1.85mm 0.65mm 1.05mm Gold Plated Nickel 0.55Ω 3.5Ω 0.5W -40°C +85°C
RS Stock No. 517-7240
Mfr. Part No.MICROSMD050F-2
BrandLittelfuse
HK$3.601
Each (In a Pack of 20)
units
1A 13.2 V dc 0.05s 0.5 A 40 A 3.43mm 0.62mm 2.8mm - 0.25Ω 900mΩ 0.8W - +85°C
RS Stock No. 867-5295
Mfr. Part No.MINISMDC260F/12-2
BrandLittelfuse
HK$17.348
Each (In a Bag of 5)
units
2A 240 V ac/dc 21s 1 A - 18.7mm 24.4mm 5.1mm Tin Plated Copper 0.218Ω 334mΩ 2.87W -20°C +85°C
RS Stock No. 692-7636
Mfr. Part No.MF-FSMF020X-2
BrandBourns
HK$3.956
Each (In a Pack of 5)
units
- 9 V 0.6s 0.2 A 40 A 1.85mm 0.65mm 1.05mm Gold Plated Nickel 0.55Ω 3.5Ω 0.5W -40°C +85°C
RS Stock No. 647-8190
Mfr. Part No.MF-MSMF075-2
BrandBourns
HK$2.85
Each (In a Pack of 10)
units
1.5A 13.2 V 0.2s 0.75 A 100 A 4.73mm 0.85mm 3.41mm Electroless Nickel Immersion Gold 0.11Ω 450mΩ 0.8W -40°C +85°C
RS Stock No. 647-8178
Mfr. Part No.MF-MSMF030-2
BrandBourns
HK$2.119
Each (In a Pack of 10)
units
- 30 V 0.1s 0.3 A 10 A 4.73mm 1.1mm 3.41mm Electroless Nickel Immersion Gold 0.3Ω 0.8W -40°C +85°C
RS Stock No. 647-8033
Mfr. Part No.MF-SM100-2
BrandBourns
HK$2.603
Each (In a Pack of 10)
units
2.2A 30 V 0.5s 1.1 A 80 A 7.98mm 3mm 5.44mm Tin Plated Brass 0.12Ω 480mΩ 1.7W -40°C +85°C
RS Stock No. 691-7594
Mfr. Part No.MF-SM185/33-2
BrandBourns
HK$4.852
Each (In a Pack of 5)
units
3.6A 33 V 5s 1.8 A 40 A 9.5mm 3mm 6.71mm Tin Plated Brass 0.04Ω 150mΩ 1.9W -40°C +85°C
RS Stock No. 517-7111
Mfr. Part No.MINISMDC050F-2
BrandLittelfuse
HK$2.632
Each (In a Pack of 10)
units
1A 24 V dc 0.15s 0.5 A 100 A 4.73mm 0.62mm 3.41mm - 0.15Ω 0.8W - +85°C
RS Stock No. 174-0802
Mfr. Part No.RF1411-000
BrandLittelfuse
HK$4.444
Each (In a Pack of 20)
units
5A 6 V dc 5s 2.6 A 100 A 4.73mm 0.78mm 3.41mm - 0.01Ω 40mΩ 1W -40°C +85°C
RS Stock No. 174-0769
Mfr. Part No.0251002.NRT1L
BrandLittelfuse
HK$5.45
Each (In a Pack of 10)
units
- 125 V ac/dc - - 2 A 7.11mm - 2.8 Dia.mm - - 0.04Ω - -55°C +125°C
RS Stock No. 817-1658
Mfr. Part No.MF-LSMF260X-2
BrandBourns
HK$4.228
Each (In a Pack of 10)
units
5.2A 24 V 5s 2.6 A 20 A 7.98mm 1.6mm 5.44mm Electroless Nickel Immersion Gold 0.02Ω 75mΩ 1.5W -40°C +85°C
RS Stock No. 867-5245
Mfr. Part No.MICROSMD200F-2
BrandLittelfuse
HK$4.085
Each (In a Bag of 10)
units
4A 6 V dc 2.5s 2 A 100 A 2.8mm 3.43mm 1.17mm Tin 0.02Ω 60mΩ 0.8W -40°C +85°C
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