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

135 of 999+
ABB Emax2 Electronic Circuit Breaker 800A 1SDA07, 4 channels
  • RS Stock No. 259-4623
  • Mfr. Part No. 1SDA072891R1
Each
HK$70,416.93
Better World
Schneider Electric Acti 9 iC60H MCB, 1P, 25A Curve B, 100 → 133V AC, 72V DC, 10 kA Breaking Capacity
  • RS Stock No. 791-3177
  • Mfr. Part No. A9F53125
Each
HK$224.10
ABB Emax2 Electronic Circuit Breaker 6.3kA Ekip Hi-Touch LSI, 4 / f channels
  • RS Stock No. 259-3967
  • Mfr. Part No. 1SDA072019R1
Each
HK$532,944.95
Schneider Electric, ComPacT MCCB 4P 1.25kA, Breaking Capacity 42 kA, Fixed Mount
  • RS Stock No. 345-321
  • Mfr. Part No. C125H42AFM
Each
HK$139,364.11
Better World
Schneider Electric ComPact NSX, Easy Pact CVS Insulation accessory for use with ComPact NSX, Easy Pact CVS
  • RS Stock No. 219-9407
  • Mfr. Part No. LV432578
Each
HK$343.59
Better World
Siemens SENTRON 3VA9 Cover for use with 3VA4/5 125
  • RS Stock No. 218-1802
  • Mfr. Part No. 3VA9131-0WF30
Each
HK$191.70
ABB Emax2 Electronic Circuit Breaker 800A Ekip Dip LSI, 4 channels
  • RS Stock No. 259-3542
  • Mfr. Part No. 1SDA071522R1
Each
HK$63,227.91
35A Fuse Holder for 30 x 30 x 17mm Fuse, 500V
  • RS Stock No. 263-442
  • Mfr. Part No. 35GD33 GAUGE PIECE D3 35A 500V FOR E33
1 Pack of 25
HK$573.20
Better World
Siemens SENTRON 5SL4 MCB, 3+N, 32A Curve C, 400V AC, 72V DC
  • RS Stock No. 209-7475
  • Mfr. Part No. 5SL4432-7
Each
HK$1,806.70
Schurter 3.15A T Ceramic Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 830-4230P
  • Mfr. Part No. 8020.5016.G
Each (Supplied in a Bag)
HK$6.18
Siemens 80A Centred Tag Fuse, NH1, 500V ac
  • RS Stock No. 203-2159
  • Mfr. Part No. 3NA7124
Each (In a Pack of 3)
HK$110.933
Schneider Electric Linergy Busbar, 25mm Pitch
  • RS Stock No. 130-813
  • Mfr. Part No. LVS04127
Each
HK$5,980.53
Better World
Siemens, SENTRON MCCB 4P 40A, Breaking Capacity 55 kA, Fixed Mount
  • RS Stock No. 271-9333
  • Mfr. Part No. 3VA1140-5GD46-0AA0
Each
HK$4,754.00
Bourns Thermal Fuse +82°C 50 A, 28V
  • RS Stock No. 258-6412
  • Mfr. Part No. SC82AAB
Each (In a Pack of 10)
HK$6.17
Schneider Electric, ComPacT NSX Circuit breaker 1P 63A, Breaking Capacity 25 kA, Busbar System
  • RS Stock No. 654-191
  • Mfr. Part No. IL0631P251
Each
HK$1,612.07
Schneider Electric Acti9 iID RCCB, 25A, 4 Pole, 30mA, Type A-SI, 380 → 415V ac
  • RS Stock No. 654-743
  • Mfr. Part No. A9R61425
Each
HK$5,396.40
Bulgin 10A Panel Mount Fuse Holder for 5 x 20mm Fuse, 1P, 250V ac
  • RS Stock No. 359-5719
  • Mfr. Part No. FX0455/S
Each (In a Pack of 5)
HK$52.08
Schneider Electric, ComPacT NSX Circuit breaker 1P 50A, Breaking Capacity 25 kA, Busbar System
  • RS Stock No. 654-229
  • Mfr. Part No. IL0501P252
Each
HK$1,612.07
Eaton xEffect MCB, 1+N, 3A Curve C, 240V AC, 48V DC, 10 kA Breaking Capacity
  • RS Stock No. 922-7071
  • Mfr. Part No. 278664 FAZ-C3/1N
Each
HK$306.40
Hager RCBO, 32A Current Rating, 4P Poles, 30mA Trip Sensitivity, Type A
  • RS Stock No. 602-211
  • Mfr. Part No. ADX482C
Each
HK$6,212.30
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