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

47266 Products showing for Fuses & Circuit Breakers

17 of 999+
In Stock
Eaton 20A T Glass Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 852-7137
  • Mfr. Part No. MDL-20-R
Each
HK$20.20
In Stock
Better World
Siemens, SENTRON MCCB 3P 200A, Breaking Capacity 36 kA, Fixed Mount
  • RS Stock No. 209-5075
  • Mfr. Part No. 3VA1220-4EF32-0AA0
Each
HK$7,242.60
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 100A, Breaking Capacity 25 kA, Fixed Mount
  • RS Stock No. 874-4143
  • Mfr. Part No. 3VA1110-3ED36-0AA0
Each
HK$2,843.10
In Stock
Schurter 10A Panel Mount Fuse Holder for 5 x 20mm Fuse, 2P
  • RS Stock No. 789-7851
  • Mfr. Part No. 4301.1403
Each
HK$43.80
In Stock
Phoenix Contact Surge Protector, 10kA, DIN Rail Mount
  • RS Stock No. 768-1192
  • Mfr. Part No. 2762265
Each
HK$2,530.70
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 100A, Breaking Capacity 55 kA
  • RS Stock No. 210-1613
  • Mfr. Part No. 3VA1110-5EE42-0AA0
Each
HK$5,380.50
Stock information currently inaccessible
Eaton 315A Centred Tag Fuse, NH00, 690V
  • RS Stock No. 182-1833
  • Mfr. Part No. 170M1572D
Each
HK$2,359.30
In Stock
Better World
Schneider Electric Acti 9 iC60H MCB, 1P, 20A Curve C, 100 → 133V AC, 72V DC, 10 kA Breaking Capacity
  • RS Stock No. 791-3307
  • Mfr. Part No. A9F54120
Each
HK$194.80
In Stock
Eaton 2A Slow-Blow Ceramic Cartridge Fuse, 50 x 21.5mm
  • RS Stock No. 229-072
  • Mfr. Part No. 2D27 FUSE-D2 2A T GL/GG 500VAC E27
1 Pack of 5
HK$81.50
In Stock
Better World
Schneider Electric Acti9 iIG40K RCCB, 25A, 3+N Pole, 300mA, Type AC, 380 → 415V ac
  • RS Stock No. 238-3477
  • Mfr. Part No. A9R79725
Each
HK$2,903.80
In Stock
Eaton 40A Ceramic Cartridge Fuse, 14 x 51mm
  • RS Stock No. 181-8582
  • Mfr. Part No. C14M40
Each (In a Box of 10)
HK$18.33
In Stock
Mersen 6A Ceramic Cartridge Fuse, 10 x 38mm
  • RS Stock No. 188-7044
  • Mfr. Part No. F222208
Each (In a Pack of 10)
HK$14.27
In Stock
Better World
Schneider Electric Acti 9 2 Phase Busbar, 415V ac, 18mm Pitch
  • RS Stock No. 776-2720
  • Mfr. Part No. A9XPH212
Each
HK$192.90
Last RS stock
Littelfuse 250mA T Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 725-8026
  • Mfr. Part No. 0213.250MXP
Each (In a Bag of 10)
HK$8.46
In Stock
RS PRO 200mA T Glass Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 611-0204
Each (In a Pack of 10)
HK$12.79
Temporarily out of stock
Better World
Siemens SENTRON 5SY4 MCB, 3+N, 8A Curve D, 400V AC, 72V DC, 5 kA Breaking Capacity
  • RS Stock No. 212-8846
  • Mfr. Part No. 5SY4608-8
Each
HK$1,567.60
Temporarily out of stock
Eaton 20A Rail Mount Fuse Holder, 1P, 460 V dc, 660 → 690V ac
  • RS Stock No. 182-1406
  • Mfr. Part No. RS20F
Each (In a Box of 10)
HK$1,222.82
In Stock
Littelfuse 500A Base Mount Fuse Holder for Mega Fuse, 1P, 32V dc
  • RS Stock No. 787-4378P
  • Mfr. Part No. 02981001ZXT
Each (Supplied in a Bag)
HK$137.70
In Stock
Schurter 10A Panel Mount Fuse Holder for 5 x 20mm Fuse, 1P, 400V ac
  • RS Stock No. 867-4371
  • Mfr. Part No. 3101.0315
Each (In a Pack of 100)
HK$32.32
In Stock
Schurter 10A Panel Mount Fuse Holder for 5 x 20mm Fuse
  • RS Stock No. 866-3362
  • Mfr. Part No. 0031.1351
Each
HK$214.90
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