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

192 of 999+
In Stock
Schurter SMD Non Resettable Fuse 5A, 125V ac/dc
  • RS Stock No. 131-741
  • Mfr. Part No. 3404.0017.11
Each (In a Pack of 10)
HK$6.94
In Stock
Littelfuse SMD Non Resettable Fuse 7A, 72V
  • RS Stock No. 738-2980
  • Mfr. Part No. 0452007.MRL
Each (In a Pack of 10)
HK$17.64
In Stock
Europa Busbar
  • RS Stock No. 849-6260
  • Mfr. Part No. ECWBB4
Each
HK$26.70
In Stock
ABB RCBO, 20A Current Rating, 3P Poles, 30mA Trip Sensitivity, System Pro M Compact Range
  • RS Stock No. 767-4419
  • Mfr. Part No. 2CSR273001R1205 DS203 M AC-B20/0,03
Each
HK$2,634.85
Temporarily out of stock
Siemens, SENTRON MCCB 3P 1.25kA, Breaking Capacity 25 kA, Fixed Mount
  • RS Stock No. 270-4873
  • Mfr. Part No. 3VA2612-5HL32-0AA0
Each
HK$97,293.20
Temporarily out of stock
ABB F200 RCCB, 100A, 2 Pole, 30mA, Type A, 230V ac
  • RS Stock No. 225-6102
  • Mfr. Part No. 2CSF202101R1900 F202 A-100/0.03
Each
HK$2,439.66
In Stock
Phoenix Contact Electronic Circuit Breaker
  • RS Stock No. 252-5377
  • Mfr. Part No. 1115657
Each
HK$974.60
Temporarily out of stock
ABB F200 RCCB, 40A, 2 Pole, 500mA, Type A, 230/400V ac
  • RS Stock No. 177-5081
  • Mfr. Part No. 2CSF202201R4400 F202 A S-40/0,5
Each
HK$2,356.93
Temporarily out of stock
Better World
Schneider Electric Acti 9 iC60H MCB, 3A Curve C, 230V AC, 72V DC, 10 kA Breaking Capacity
  • RS Stock No. 776-2446
  • Mfr. Part No. A9F07603
Each
HK$745.10
Temporarily out of stock
Vigi iC60 - earth leakage add-on block -
  • RS Stock No. 248-3706
  • Mfr. Part No. A9V15263
Each
HK$3,663.40
Temporarily out of stock
Eaton Memshield 3 3 Phase Distribution Board, 4 Way, 125 A, 250 A
  • RS Stock No. 124-3004
  • Mfr. Part No. EBM41 EBM41
Each
HK$2,564.90
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 600A, Breaking Capacity 100 kA, Fixed Mount
  • RS Stock No. 250-024
  • Mfr. Part No. 3VA6560-7HN32-2AA0
Each
HK$39,425.70
In Stock
ABB MISTRAL65 Wall Fixing Brackets
  • RS Stock No. 232-0308
  • Mfr. Part No. 1SL1927A00 MISTRAL
Each
HK$103.10
Temporarily out of stock
Wickmann 4A T Ceramic Cartridge Fuse, 5 x 20mm
  • RS Stock No. 174-0240
  • Mfr. Part No. 0477004.MXP
1 Box of 1000
HK$10,808.80
Temporarily out of stock
HENSEL ENYSTAR Distribution Board, 63 A
  • RS Stock No. 117-477
  • Mfr. Part No. FP 1107
Each
HK$1,515.00
In Stock
Littelfuse Non-Resettable Wire Ended Fuse 5A, 125V ac/dc
  • RS Stock No. 738-3021
  • Mfr. Part No. 0251005.MRT1L
Each (In a Pack of 10)
HK$5.44
In Stock
ABB Cover for use with ABB Tmax XT1
  • RS Stock No. 831-9208
  • Mfr. Part No. 1SDA066655R1 LTC XT1 3p TERMINAL COVERS LOW 2pcs
Each (In a Pack of 2)
HK$123.75
Temporarily out of stock
Schneider Electric ComPacT Trip Unit for use with ComPacT NSX100
  • RS Stock No. 655-150
  • Mfr. Part No. C103MG080
Each
HK$2,120.94
In Stock
Eaton 2A F Ceramic Cartridge Fuse, 6.3 x 25mm
  • RS Stock No. 412-554
  • Mfr. Part No. TDC180-2A
Each (In a Pack of 10)
HK$6.12
In Stock
Littelfuse SMD Non Resettable Fuse 250mA, 125V ac/dc
  • RS Stock No. 219-6068
  • Mfr. Part No. 0154.250DR
Each (In a Pack of 10)
HK$17.65
1
192
2364
Results per page

Related links