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

98 of 999+
Siemens, Sentron MCCB Molded Case Circuit Breaker 4P 1kA, Breaking Capacity 35 kA, Cable Mount
  • RS Stock No. 249-131
  • Mfr. Part No. 3VA6610-6HL46-0AA0
Each
HK$83,371.50
Better World
Siemens Surge Protector, 127 → 240 V ac, 150 → 250V dc, Clip-On Mount
  • RS Stock No. 875-1084
  • Mfr. Part No. 3RT2936-1CD00
Each
HK$191.50
Wickmann 15A T Ceramic Cartridge Fuse, 5 x 20mm
  • RS Stock No. 174-0629
  • Mfr. Part No. 0215015.MXP
Each (In a Pack of 20)
HK$10.67
Better World
Schneider Electric Straight Busbar Trunking, 3m, 25A, KBB Series
  • RS Stock No. 219-8859
  • Mfr. Part No. KBB25ED42305W
Each
HK$1,912.09
ABB S804C MCB, 4P, 16A Curve K, 415V AC, 25 kA Breaking Capacity
  • RS Stock No. 140-494
  • Mfr. Part No. 2CCS884001R0467
Each
HK$5,271.20
Siemens, SENTRON MCCB 3P 225A, Breaking Capacity 10 kA, Fixed Mount
  • RS Stock No. 147-805
  • Mfr. Part No. 3VA5222-6EC31-0AA0
Each
HK$17,303.90
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
Better World
ABB Compact Home SH200 MCB, 1P, 10A Curve B, 440V AC, 60V DC, 6 kA Breaking Capacity
  • RS Stock No. 539-8144
  • Mfr. Part No. 2CDS211001R0105 SH201-B10
Each
HK$83.20
Eaton 50A Ceramic Cartridge Fuse, 22 x 58mm
  • RS Stock No. 703-8469P
  • Mfr. Part No. C22G50
Each (Supplied in a Box)
HK$28.50
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 MCCB 4P 50A, Breaking Capacity 25 kA
  • RS Stock No. 209-6827
  • Mfr. Part No. 3VA1150-3EE42-0AA0
Each
HK$3,862.50
Schneider Electric Linergy Busbar, 25mm Pitch
  • RS Stock No. 130-813
  • Mfr. Part No. LVS04127
Each
HK$5,980.53
Eaton 2A Slow-Blow Cartridge Fuse, 10 x 38mm
  • RS Stock No. 228-664
  • Mfr. Part No. C10M2 CYLINDRICAL FUSE 10 x 38 2A AM 500V AC
1 Pack of 10
HK$126.40
Eaton 63A Centred Tag Fuse, NH02, 500V ac
  • RS Stock No. 703-8721P
  • Mfr. Part No. 63NHG02B
Each (Supplied in a Box)
HK$107.91
Schneider Electric A9R RCCB, 40A, 2 Pole, 300mA, Type A, 220 → 240V ac
  • RS Stock No. 654-094
  • Mfr. Part No. A9R24240
Each
HK$2,160.30
Schneider Electric Acti9 Acti9 C120 MCB, 2P, 63A Curve D, 380 → 415V AC, 20 kA Breaking Capacity
  • RS Stock No. 130-386
  • Mfr. Part No. A9N18382
Each
HK$4,828.29
Siemens SENTRON 5SY4520 Circuit Breaker, 2P, 20A Curve B, 230V AC, 60V DC, 15 kA Breaking Capacity
  • RS Stock No. 153-525
  • Mfr. Part No. 5SY4520-7
Each
HK$551.50
Better World
Schneider Electric Multi 9 C60SP MCB, 1P, 13A Curve C, 415V AC, 60V DC, 20 kA Breaking Capacity
  • RS Stock No. 211-2358
  • Mfr. Part No. M9F22113
Each
HK$137.90
RS PRO 5A F Ceramic Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 413-226
Each (In a Pack of 10)
HK$6.77
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 800A, Breaking Capacity 35 kA, Fixed Mount
  • RS Stock No. 249-641
  • Mfr. Part No. 3VA6580-5HN32-0AA0
Each
HK$38,337.50
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