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

79 of 999+
Temporarily out of stock
Siemens 100A Cartridge Fuse, 22 X 58mm
  • RS Stock No. 665-093
  • Mfr. Part No. 3NC2200-5
1 Pack of 5
HK$1,714.60
Temporarily out of stock
40A Cartridge Fuse, 31 x 131mm
  • RS Stock No. 263-308
  • Mfr. Part No. 40MJ31-8
1 Pack of 10
HK$5,502.70
In Stock
Bourns 0.05A Resettable Fuse, 220V
  • RS Stock No. 167-4670
  • Mfr. Part No. CMF-RL50A-0
Each (In a Box of 300)
HK$2.957
In Stock
Eaton 3A T Glass Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 412-425
  • Mfr. Part No. BK1-TDC11-3-R
Each (In a Pack of 10)
HK$13.27
In Stock
Bulgin 16A Panel Mount Fuse Holder for 6.3 x 32mm Fuse, 1P, 250V ac
  • RS Stock No. 512-6006
  • Mfr. Part No. FX0419
Each
HK$101.00
Temporarily out of stock
Schneider Electric Acti9 iID RCCB, 25A, 2 Pole, 300mA, Type A-SI, 220 → 240V ac
  • RS Stock No. 654-800
  • Mfr. Part No. A9R61225
Each
HK$2,692.67
Temporarily out of stock
Eaton 40A Cartridge Fuses, 63.5 x 359mm
  • RS Stock No. 254-751
  • Mfr. Part No. 24OEGMA40
1 Pack of 3
HK$12,392.00
Temporarily out of stock
Schneider Electric ComPact Auxiliary Contact for use with NS630b to NS3200
  • RS Stock No. 275-6652
  • Mfr. Part No. 33012
Each
HK$532.82
Temporarily out of stock
Schneider Electric Acti9 Acti9 iC60 MCB, 2P, 25A, Type AC, 500V AC, 300 mA Breaking Capacity
  • RS Stock No. 347-124
  • Mfr. Part No. A9Q04225
Each
HK$3,473.07
Temporarily out of stock
Better World
Siemens SENTRON Electronic Circuit Breaker 250A 3VA2, 3 channels Type N
  • RS Stock No. 157-372
  • Mfr. Part No. 3VA2225-8HL32-0AA0
Each
HK$16,784.10
Temporarily out of stock
Phoenix Contact Surge Protector, 20kA, DIN Rail Mount
  • RS Stock No. 207-2728
  • Mfr. Part No. 2906769
Each
HK$1,093.30
In Stock
Schneider Electric, ComPacT NSX Circuit breaker 1P 63A, Breaking Capacity 25 kA, Busbar System
  • RS Stock No. 654-210
  • Mfr. Part No. IL0631P253
Each
HK$1,612.07
Temporarily out of stock
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 100A, Breaking Capacity 35 kA, Fixed Mount
  • RS Stock No. 268-566
  • Mfr. Part No. 3VA6110-5HL41-0AA0
Each
HK$9,207.70
Temporarily out of stock
Eaton PC Board Non Resettable Fuse, Radial 250mA, 250V ac
  • RS Stock No. 169-9496
  • Mfr. Part No. SR-5-250MA-BK
Each (In a Bag of 200)
HK$7.522
Temporarily out of stock
Schneider Electric, ComPacT MCCB 3P 1kA, Breaking Capacity 31 kA, Fixed Mount
  • RS Stock No. 428-721
  • Mfr. Part No. C100H320FM
Each
HK$97,299.83
Temporarily out of stock
160A Tag Fuse, 40 x 192mm, 0.66/1.5kV
  • RS Stock No. 262-600
  • Mfr. Part No. TFC160
Each
HK$2,966.70
Temporarily out of stock
Schneider Electric, ComPacT MCCB 3P 125A, Fixed Mount
  • RS Stock No. 260-7674
  • Mfr. Part No. C12B3TM125L
Each
HK$5,419.32
In Stock
Schurter 5A T Ceramic Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 830-4243
  • Mfr. Part No. 8020.5018.G
Each (In a Pack of 10)
HK$7.08
Currently unavailable
Sato Parts F-700 Series Fuse Cover for 6.3 x 32 mm, 6.35 x 30 x 6.35 x 31.8 mm Fuse
  • RS Stock No. 229-4971
  • Mfr. Part No. F-700-FCL
Each
HK$60.11
Temporarily out of stock
Eaton RCBO, 6A Current Rating, 3+N Poles, 300mA Trip Sensitivity, Type C, xPole Range
  • RS Stock No. 229-301
  • Mfr. Part No. 120665 mRB6-6/3N/C/03-A
Each
HK$4,129.51
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