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

2226 of 999+
Temporarily out of stock
Better World
Schneider Electric 100A 444x220mm Fuse Block, 230 - 690V
  • RS Stock No. 219-8938
  • Mfr. Part No. KSB100SM512
Each
HK$6,381.30
Temporarily out of stock
Siemens SENTRON Interlock for use with Circuit Breaker 3WL10 / 3VA27
  • RS Stock No. 266-523
  • Mfr. Part No. 3VW9011-0BA22
Each
HK$954.30
In Stock
Better World
ABB, XT2S MCCB 4P 32A, Fixed Mount
  • RS Stock No. 236-7481
  • Mfr. Part No. 1SDA067752R1 XT2S 160 TMG 32A FF
Each
HK$3,825.70
Temporarily out of stock
ABB S803S MCB, 3P, 40A, KM, 690V AC, 50 kA Breaking Capacity
  • RS Stock No. 141-100
  • Mfr. Part No. 2CCS863001R0556
Each
HK$6,246.75
Temporarily out of stock
ABB 6A Tag Fuse, 125 x 30 x 60mm, 500V
  • RS Stock No. 250-4400
  • Mfr. Part No. 1SCA022697R3230
1 Box of 3
HK$782.44
Temporarily out of stock
ABB S800S MCB, 1P, 40A Curve D, 240V AC, 50 kA Breaking Capacity
  • RS Stock No. 140-944
  • Mfr. Part No. 2CCS861001R0401
Each
HK$1,946.25
In Stock
Better World
Schneider Electric Acti 9 iC60L MCB, 2P, 63A Curve B, 15 kA Breaking Capacity
  • RS Stock No. 219-9257
  • Mfr. Part No. A9F93263
Each
HK$2,657.70
In Stock
ABB RCBO, 10A Current Rating, 3P Poles, 30mA Trip Sensitivity, System Pro M Compact Range
  • RS Stock No. 767-4406
  • Mfr. Part No. 2CSR273001R1104 DS203 M AC-C10/0,03
Each
HK$2,446.10
Temporarily out of stock
Phoenix Contact CB-E1 Electronic Circuit breaker 4A 24V CB E1, On Base Element
  • RS Stock No. 217-6385
  • Mfr. Part No. 2800918
Each
HK$380.10
In Stock
Sensata Airpax Airpax Thermal Circuit Breaker - PR21 2 Pole Panel Mount, 20A Current Rating
  • RS Stock No. 275-0443
  • Mfr. Part No. PR21-4-20.0A-XX-V
Each
HK$425.70
In Stock
RS PRO PC Board Non Resettable Fuse, Radial 4A, 250V ac
  • RS Stock No. 611-0406
Each (In a Pack of 10)
HK$8.35
In Stock
RS PRO Industrial Surge Protector, 40kA, 5.3kV, DIN Rail Mount
  • RS Stock No. 101-777
Each
HK$638.39
Temporarily out of stock
Eaton xEffect - FRCdM RCCB, 63A, 4 Pole, 30mA, 240/415V ac
  • RS Stock No. 127-418
  • Mfr. Part No. 180424 FRCDM-63/4/003-G/B/60HZ
Each
HK$10,039.90
Temporarily out of stock
Lovato P1 MCB, 3P, 13A Curve C, 230V AC, 80V DC
  • RS Stock No. 248-5621
  • Mfr. Part No. P1MB3PC13
Each
HK$715.44
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 100A, Breaking Capacity 110 kA, Fixed Mount
  • RS Stock No. 270-3579
  • Mfr. Part No. 3VA2010-7HN46-0AA0
Each
HK$23,652.40
Temporarily out of stock
Better World
ABB System Pro M Compact S200 MCB, 3P, 500mA Curve D
  • RS Stock No. 237-3311
  • Mfr. Part No. 2CDS253103R0981
Each
HK$2,194.01
In Stock
Siemens SENTRON 5SJ MCB, 2P, 10A
  • RS Stock No. 232-2252
  • Mfr. Part No. 5SJ4210-8HG41
Each
HK$1,209.90
Temporarily out of stock
ABB Emax2 Electronic Circuit Breaker 1.25kA Ekip Dip LI, 4 channels
  • RS Stock No. 259-3494
  • Mfr. Part No. 1SDA071461R1
Each
HK$56,678.53
Temporarily out of stock
ABB RCBO, 50A Current Rating, 1P Poles, Type B
  • RS Stock No. 237-5231
  • Mfr. Part No. 2CSR275051R0505
Each
HK$1,569.29
Temporarily out of stock
400A Tag Fuse, 72 x 150mm, 690V
  • RS Stock No. 262-393
  • Mfr. Part No. 400NHM3B-690
1 Pack of 3
HK$1,233.10
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