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

122 of 999+
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 400A, Breaking Capacity 100 kA, Fixed Mount
  • RS Stock No. 249-778
  • Mfr. Part No. 3VA6440-7KQ31-0AA0
Each
HK$32,969.70
Temporarily out of stock
Schurter SMD Non Resettable Fuse 3.15A, 250 V ac, 125V dc
  • RS Stock No. 876-1949P
  • Mfr. Part No. 3404.2471.22
Each (Supplied on a Reel)
HK$9.28
Temporarily out of stock
Better World
Siemens, Sentron MCCB Molded Case Circuit Breaker 4P 250A, Breaking Capacity 3 kA
  • RS Stock No. 245-664
  • Mfr. Part No. 3VA6225-6HM41-2AA0
Each
HK$20,907.60
Temporarily out of stock
Siemens, SENTRON MCCB 3P 100A, Breaking Capacity 35 kA, Fixed Mount
  • RS Stock No. 147-655
  • Mfr. Part No. 3VA5210-7ED31-1AA0
Each
HK$7,484.70
Temporarily out of stock
Siemens, SENTRON MCCB 4P 225A, Breaking Capacity 100 kA, Fixed Mount
  • RS Stock No. 256-490
  • Mfr. Part No. 3VA5322-7EF41-2AA0
Each
HK$18,866.30
Temporarily out of stock
Siemens, SENTRON MCCB 3P 100A, Breaking Capacity 10 kA, Fixed Mount
  • RS Stock No. 147-407
  • Mfr. Part No. 3VA5210-7ED31-2AA0
Each
HK$8,041.40
Temporarily out of stock
Siemens, SENTRON MCCB 1P 90A, Breaking Capacity 5 kA, Fixed Mount
  • RS Stock No. 147-727
  • Mfr. Part No. 3VA5190-5ED11-0AA0
Each
HK$1,280.40
Temporarily out of stock
Siemens, SENTRON MCCB 1P 15A, Breaking Capacity 5 kA, Fixed Mount
  • RS Stock No. 147-756
  • Mfr. Part No. 3VA5195-6ED11-0AA0
Each
HK$1,200.00
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 40A, Breaking Capacity 200 kA, Fixed Mount
  • RS Stock No. 270-4612
  • Mfr. Part No. 3VA2140-0KQ46-0AA0
Each
HK$27,489.00
In Stock
Better World
Schneider Electric RCBO, 32A Current Rating, 4P Poles, 30mA Trip Sensitivity, Acti 9 Range
  • RS Stock No. 247-1931
  • Mfr. Part No. A9D87432
Each
HK$3,739.50
Temporarily out of stock
Littelfuse PC Board Non Resettable Fuse, Radial 50mA, 125V ac/dc
  • RS Stock No. 878-3233
  • Mfr. Part No. 0273.050H
Each
HK$56.10
Temporarily out of stock
ABB Tmax XT Rear Terminal for use with Circuit Breaker
  • RS Stock No. 232-0164
  • Mfr. Part No. 1SDA066271R1 R FP XT2 4PCS
Each
HK$670.64
In Stock
ABB System Pro M Compact S200M MCB, 1P, 40A Curve D, 230V AC, 72V DC, 15 kA Breaking Capacity
  • RS Stock No. 746-8150
  • Mfr. Part No. 2CDS271001R0401 S201M-D40
Each
HK$137.40
In Stock
HENSEL ENYBOARD Distribution Board, 41 A
  • RS Stock No. 117-118
  • Mfr. Part No. RK 1019 T
Each
HK$750.86
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 160A, Breaking Capacity 36 kA
  • RS Stock No. 210-1626
  • Mfr. Part No. 3VA1116-4EE32-0AA0
Each
HK$7,416.30
Temporarily out of stock
ABB Tmax XT Front Terminal for use with Tmax XT
  • RS Stock No. 237-6145
  • Mfr. Part No. 1SDA066856R1 F XT2 8PCS
Each
HK$644.35
In Stock
Littelfuse SMD Non Resettable Fuse 8A, 125V
  • RS Stock No. 738-2873P
  • Mfr. Part No. 0154008.DR
Each (Supplied on a Reel)
HK$16.84
In Stock
Littelfuse SMD Non Resettable Fuse 1A, 250V
  • RS Stock No. 787-4322P
  • Mfr. Part No. 0464001.DR
Each (Supplied on a Reel)
HK$9.20
Temporarily out of stock
Eaton 50A Cartridge Fuses, 22.2 x 58mm
  • RS Stock No. 228-994
  • Mfr. Part No. C22G50S
1 Pack of 10
HK$1,212.90
Temporarily out of stock
Schneider Electric MasterPact Adapter for use with Masterpact MasterPact MTZ1 Circuit Breaker
  • RS Stock No. 654-646
  • Mfr. Part No. LV833643SP
Each
HK$6,017.50
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