Fuses & Circuit Breakers

Although they work in different ways, fuses and circuit breakers broadly have the same purpose; to protect electrical appliances and electrical circuits from short circuits, and excessive current (called overcurrent or overload).

Fuses

Fuses are relatively low cost electrical safety devices. If too much current enters the circuit, the fuse will burn out (sometimes called blowing out). When the fuse blows out it breaks the circuit. This protects the attached devices and allows you to touch devices without being electrocuted. When the fuse blows, it must be replaced before using the device or appliance again.

Circuit breakers

Circuit breakers work in a similar way to fuses, but they are resettable. Once a fault is detected (this is typically a short circuit or an excessive amount of current flowing through the circuit) the circuit breaker will interrupt the flow of current. When the circuit breaker trips, it's simply a case of flicking a switch to reset the circuit breaker. As soon as you've reset the circuit breaker, it is ready to use again.

Circuit Breakers
Circuit Breakers
Earth & Lightning Protection
Earth & Lightning Protection
Fuse Holders & Accessories
Fuse Holders & Accessories
Fuses
Fuses

47265 Products showing for Fuses & Circuit Breakers

55 of 999+
In Stock
Legrand 40A Ceramic Cartridge Fuse, 14 x 51mm
  • RS Stock No. 180-6123
  • Mfr. Part No. 0 143 40
Each (In a Box of 10)
HK$43.13
In Stock
Better World
Siemens SENTRON 5SL6 MCB, 1+N, 16A Curve C, 230V AC, 72V DC
  • RS Stock No. 213-1055
  • Mfr. Part No. 5SL6516-7
Each
HK$418.40
Temporarily out of stock
ABB Tmax XT Shunt Opening Release for use with XT1, XT4
  • RS Stock No. 237-6050
  • Mfr. Part No. 1SDA066327R1 SOR-C XT1..XT4 F/P 480-525
Each
HK$982.60
Temporarily out of stock
Schurter Non-Resettable Wire Ended Fuse 1A, 250V ac
  • RS Stock No. 173-7890
  • Mfr. Part No. 8020.0514.PT
1 Box of 1000
HK$2,287.60
In Stock
Littelfuse PC Board Non Resettable Fuse, Radial 100mA, 125V ac/dc
  • RS Stock No. 878-3242
  • Mfr. Part No. 0273.100H
Each
HK$66.90
In Stock
SIBA SMD Non Resettable Fuse 630mA, 250V
  • RS Stock No. 736-2627
  • Mfr. Part No. 160000.0,63
Each (In a Bag of 10)
HK$76.69
In Stock
Schurter PC Board Non Resettable Fuse, Radial 2A, 250V ac
  • RS Stock No. 866-8610
  • Mfr. Part No. 0034.6918
Each (In a Pack of 100)
HK$4.035
In Stock
Mersen 700A size 32 FF Square Body Fuse, aR, 700V
  • RS Stock No. 304-2164
  • Mfr. Part No. N300070
Each
HK$2,091.90
In Stock
ABB RCCB, 40A, 4 Pole
  • RS Stock No. 189-5642
  • Mfr. Part No. 2CSF204023R1400 F204 AC-40/0,03-L
Each
HK$893.20
In Stock
Better World
ABB S200C MCB, 4P, 20A Curve C, 415V AC, 6 kA Breaking Capacity
  • RS Stock No. 212-1666
  • Mfr. Part No. 2CDS254280R0204
Each
HK$1,213.29
Temporarily out of stock
Siemens SENTRON Nut Keeper Kit for use with 3VA1
  • RS Stock No. 269-7188
  • Mfr. Part No. 3VA9403-0QG00
Each (In a Pack of 3)
HK$147.067
Temporarily out of stock
Better World
Siemens SENTRON 5SY6 MCB, 2P, 32A Curve C, 400V AC, 72V DC, 6 kA Breaking Capacity
  • RS Stock No. 209-6017
  • Mfr. Part No. 5SY6232-7
Each
HK$821.70
In Stock
Better World
Schneider Electric RCBO, 10A Current Rating, 1P+N Poles, 30mA Trip Sensitivity, Acti 9 Range
  • RS Stock No. 790-9276
  • Mfr. Part No. A9D19810
Each
HK$1,687.70
In Stock
Littelfuse PC Board Non Resettable Fuse, Radial 4A, 250V ac
  • RS Stock No. 226-6577
  • Mfr. Part No. 37014000000
Each (In a Pack of 10)
HK$5.41
In Stock
Littelfuse 0.65A Resettable Fuse, 72V
  • RS Stock No. 517-6641
  • Mfr. Part No. RXEF065
Each (In a Pack of 10)
HK$2.55
Temporarily out of stock
Eaton 400A Bolted Tag Fuse, B4, 460 V dc, 660V ac, 111mm
  • RS Stock No. 182-1458
  • Mfr. Part No. TMF400M450
Each
HK$7,014.70
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 100A, Breaking Capacity 85 kA, Fixed Mount
  • RS Stock No. 211-3777
  • Mfr. Part No. 3VA2110-6HN32-0AA0
Each
HK$8,175.60
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 160A, Breaking Capacity 85 kA, Fixed Mount
  • RS Stock No. 211-3778
  • Mfr. Part No. 3VA2116-6KP42-0AA0
Each
HK$23,372.50
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 20A, Breaking Capacity 36 kA, Fixed Mount
  • RS Stock No. 211-3722
  • Mfr. Part No. 3VA1120-4EF42-0AA0
Each
HK$4,412.70
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 40A, Breaking Capacity 25 kA
  • RS Stock No. 209-6813
  • Mfr. Part No. 3VA1140-3EF32-0AA0
Each
HK$3,121.70
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