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

2289 of 999+
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 63A, Breaking Capacity 55 kA, Fixed Mount
  • RS Stock No. 211-3793
  • Mfr. Part No. 3VA2163-5MN32-0AA0
Each
HK$5,621.40
Temporarily out of stock
SENTRON Draw-Out Unit for use with 3VA63 Series
  • RS Stock No. 263-938
  • Mfr. Part No. 3VA9344-0KD00
1 Kit
HK$20,965.90
Temporarily out of stock
Schneider Electric, ComPacT MCCB 3P 630A, Fixed Mount
  • RS Stock No. 260-8248
  • Mfr. Part No. C63V32D630
Each
HK$44,481.87
Temporarily out of stock
Phoenix Contact Thermomagnetic Device Circuit Breaker Thermal Circuit Breaker - CB Single Pole 50V dc Voltage Rating,
  • RS Stock No. 212-8782
  • Mfr. Part No. 2800840
Each
HK$366.50
In Stock
ETA ESX10 Electronic Circuit breaker 2A 24V ESX10-T, 1 channels , Plug-In Mounting
  • RS Stock No. 210-2132
  • Mfr. Part No. ESX10-TB-101-DC24V-2A-E
Each
HK$740.90
Temporarily out of stock
Siemens 24V ac Circuit Trip
  • RS Stock No. 223-7657
  • Mfr. Part No. 5TT4462-2
Each
HK$923.10
In Stock
Schneider Electric Multi9 M9F MCB Mini Circuit Breaker, 1P, 6A Curve D, 240V AC, 10 kA Breaking Capacity
  • RS Stock No. 654-531
  • Mfr. Part No. M9F12106
Each
HK$496.50
Temporarily out of stock
Eaton IZMX/INX Cassette for use with INX40…4-…W, IZMX40…4-…W
  • RS Stock No. 132-950
  • Mfr. Part No. 183960 IZMX-CAS404-2500-1
Each
HK$42,340.86
Temporarily out of stock
Siemens SENTRON 5SY Circuit Breaker, 3P, 10A Curve D, 440V AC, 60V DC, 30 kA Breaking Capacity
  • RS Stock No. 664-357
  • Mfr. Part No. 5SY7310-8
Each
HK$1,669.34
Temporarily out of stock
Better World
Schneider Electric Horizontal Distribution Busbar Trunking, 3m, 100A, Canalis KS Series
  • RS Stock No. 211-0451
  • Mfr. Part No. KSA100ED4306
Each
HK$4,254.00
In Stock
Siemens 6.3A F Ceramic Cartridge Fuse, 5 x 20mm
  • RS Stock No. 226-2958
  • Mfr. Part No. 8WA1822-7EF25
Each (In a Pack of 10)
HK$30.68
In Stock
Siemens 230V ac Circuit Trip Circuit Trip
  • RS Stock No. 622-0648
  • Mfr. Part No. 5TT4101-0
Each
HK$471.80
In Stock
Legrand 6A Ceramic Cartridge Fuse, 10 x 38mm
  • RS Stock No. 180-6109
  • Mfr. Part No. 0 130 06
Each (In a Box of 10)
HK$19.41
Temporarily out of stock
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 100A, Breaking Capacity 65 kA, Fixed Mount
  • RS Stock No. 269-968
  • Mfr. Part No. 3VA6110-6KM31-0AA0
Each
HK$20,089.50
In Stock
Eaton 30A Panel Mount Fuse Holder for 6.3 x 32mm Fuse, 480V
  • RS Stock No. 225-8227
  • Mfr. Part No. BK-HVP-R
Each (In a Pack of 5)
HK$61.54
In Stock
Siemens 32A NH Fuse, NH000, 500V ac
  • RS Stock No. 397-351
  • Mfr. Part No. 3NA3812
Each (In a Pack of 3)
HK$58.90
Temporarily out of stock
Siemens SENTRON 5SP37 MCB, 1P, 50A, Type E, 230V AC, 25 kA Breaking Capacity
  • RS Stock No. 328-516
  • Mfr. Part No. 5SP3750-2
1 Set
HK$3,459.86
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 1P 25A, Breaking Capacity 55 kA, Fixed Mount
  • RS Stock No. 271-9860
  • Mfr. Part No. 3VA1125-5ED12-0AA0
Each
HK$1,746.00
Temporarily out of stock
ABB Emax2 Electronic Circuit Breaker 2kA Ekip G Hi-Touch LSIG, 4 channels
  • RS Stock No. 259-3704
  • Mfr. Part No. 1SDA071680R1
Each
HK$140,996.88
Temporarily out of stock
ABB SACE Emax 2 Fixed Part for use with Circuit Breaker
  • RS Stock No. 231-9316
  • Mfr. Part No. 1SDA073910R1 E2.2 W FP Iu=2000 4p HR
Each
HK$21,650.21
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