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. 647-8156
Mfr. Part No.MF-MSMF050-2
BrandBourns
HK$2.977
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. 647-8190
Mfr. Part No.MF-MSMF075-2
BrandBourns
HK$3.15
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. 692-7636
Mfr. Part No.MF-FSMF020X-2
BrandBourns
HK$7.004
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. 167-4517
Mfr. Part No.MF-FSMF020X-2
BrandBourns
HK$3.213
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. 647-8033
Mfr. Part No.MF-SM100-2
BrandBourns
HK$2.822
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. 817-1668
Mfr. Part No.MF-MSMF110/24X-2
BrandBourns
HK$3.707
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. 162-2532
Mfr. Part No.MF-SM185/33-2
BrandBourns
HK$2.647
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. 647-8178
Mfr. Part No.MF-MSMF030-2
BrandBourns
HK$2.342
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. 817-1709
Mfr. Part No.MF-S120
BrandBourns
HK$4.526
Each (In a Pack of 10)
units
2.7A 15 V 5s 1.2 A 100 A 7.1mm 1mm 5.2mm Quarter Hard Nickel 0.085Ω 160mΩ 1.2W -40°C +85°C
RS Stock No. 897-8967
Mfr. Part No.MF-MSMF250/16X-2
BrandBourns
HK$4.439
Each (In a Pack of 10)
units
5A 16 V 5s 2.5 A 100 A 4.83mm 1.6mm 3.41mm Gold Plated Nickel 0.015Ω 100mΩ 1.2W -40°C +85°C
RS Stock No. 910-8594
Mfr. Part No.NR77AB0
BrandBourns
HK$14.732
Each (In a Pack of 5)
units
40A 28 V dc - - 25 A 4.8mm 0.89mm 2.8mm Copper Alloy - 5mΩ - - -
RS Stock No. 817-1670
Mfr. Part No.MF-PSHT010X-2
BrandBourns
HK$7.663
Each (In a Pack of 10)
units
600mA 16 V 1.5s 0.1 A 40 A 2.3mm 0.8mm 1.5mm Gold Plated Nickel 7.5Ω 1W -40°C +125°C
RS Stock No. 817-1618
Mfr. Part No.CMF-SDP10-2
BrandBourns
HK$8.693
Each (In a Pack of 10)
units
360mA 230 V 3.8s 0.18 A 1 A 11mm 11.5mm 9mm - - 10Ω - -40°C +125°C
RS Stock No. 817-1719
Mfr. Part No.MF-S350
BrandBourns
HK$3.131
Each (In a Pack of 10)
units
6.3A 30 V 3s 3.5 A 100 A 14mm 1.1mm 13.5mm Quarter Hard Nickel 0.017Ω 31mΩ 2.5W -40°C +85°C
RS Stock No. 647-8241
Mfr. Part No.MF-NSMF012-2
BrandBourns
HK$3.203
Each (In a Pack of 10)
units
- 30 V 0.2s 0.12 A 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. 647-8134
Mfr. Part No.MF-MSMF010-2
BrandBourns
HK$2.472
Each (In a Pack of 10)
units
- 60 V 1.5s 0.1 A 40 A 4.73mm 1.1mm 3.41mm Electroless Nickel Immersion Gold 0.7Ω 15Ω 0.8W -40°C +85°C
RS Stock No. 817-1658
Mfr. Part No.MF-LSMF260X-2
BrandBourns
HK$5.282
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. 817-1686
Mfr. Part No.MF-RG400-0
BrandBourns
HK$7.159
Each (In a Pack of 10)
units
6.8A 16 V dc 1.7s 4 A 20 A 8.9mm 12.8mm 3mm - 0.021Ω 60mΩ 2.4W -40°C +85°C
RS Stock No. 691-7516
Mfr. Part No.MF-PSMF075X-2
BrandBourns
HK$3.348
Each (In a Pack of 5)
units
1.5A 6 V 0.2s 0.75 A 40 A 2.3mm 1.25mm 1.5mm Gold Plated Nickel 0.09Ω 350mΩ 0.6W -40°C +85°C