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

222 of 999+
Temporarily out of stock
Better World
Schneider Electric Multi 9 C60BP MCB, 3P, 40A Curve D, 440V AC, 15 kA Breaking Capacity
  • RS Stock No. 211-2461
  • Mfr. Part No. M9F43340
Each
HK$1,610.00
Temporarily out of stock
Better World
ABB Emax2 Electronic Circuit Breaker 2.5kA Ekip Hi-Touch LSI, 3 channels
  • RS Stock No. 259-3242
  • Mfr. Part No. 1SDA071129R1
Each
HK$177,593.97
Temporarily out of stock
ABB Emax2 Electronic Circuit Breaker 3.2kA Ekip G Touch LSIG, 3 channels
  • RS Stock No. 259-4331
  • Mfr. Part No. 1SDA072497R1
Each
HK$164,360.29
Temporarily out of stock
ABB Emax2 Electronic Circuit Breaker 4kA Ekip Dip LSI, 3 channels
  • RS Stock No. 259-3337
  • Mfr. Part No. 1SDA071243R1
Each
HK$244,158.03
Temporarily out of stock
Schneider Electric PowerPact Electronic Circuit Breaker 250A PowerPact, DIN Rail Mount
  • RS Stock No. 276-1727
  • Mfr. Part No. NJGF36250U31XTW
Each
HK$24,321.64
Temporarily out of stock
ABB Emax2 Electronic Circuit Breaker 3.2kA 1SDA07, 3 channels
  • RS Stock No. 259-4339
  • Mfr. Part No. 1SDA072507R1
Each
HK$182,168.73
Temporarily out of stock
ABB Emax2 Electronic Circuit Breaker 800A Ekip Hi-Touch LSI, 3 channels
  • RS Stock No. 259-4028
  • Mfr. Part No. 1SDA072099R1
Each
HK$62,733.15
Temporarily out of stock
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 100A, Breaking Capacity 150 kA, Fixed Mount
  • RS Stock No. 268-387
  • Mfr. Part No. 3VA6110-8KP31-0AA0
Each
HK$18,917.60
In Stock
Better World
Siemens Sentron 5SY4 MCB, 1P, 1A Curve D, 230V AC, 10 kA Breaking Capacity
  • RS Stock No. 124-3151
  • Mfr. Part No. 5SY4101-8
Each
HK$507.00
Temporarily out of stock
ABB Emax2 Electronic Circuit Breaker 1.25kA Ekip G Touch LSIG, 4 channels
  • RS Stock No. 259-4680
  • Mfr. Part No. 1SDA072957R1
Each
HK$108,974.30
In Stock
Littelfuse SMD Non Resettable Fuse 2.5A, 125V
  • RS Stock No. 738-2860P
  • Mfr. Part No. 015402.5DRT
Each (Supplied on a Reel)
HK$12.53
Temporarily out of stock
Siemens SENTRON 5SY8 MCB, 4P, 50A Curve D, 400V AC, 72V DC, 20 kA Breaking Capacity
  • RS Stock No. 610-361
  • Mfr. Part No. 5SY8450-8BB08
Each
HK$2,037.16
In Stock
Eaton 50mA F Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 169-9397
  • Mfr. Part No. S500-50-R
1 Bag of 1000
HK$32,162.90
Temporarily out of stock
Siemens SENTRON 5SY4 MCB, 2P, 2A Curve B, 400V AC, 60V DC, 35 kA Breaking Capacity
  • RS Stock No. 610-308
  • Mfr. Part No. 5SY4202-6
Each
HK$680.00
In Stock
RS PRO 2A T Ceramic Cartridge Fuse, 5 x 20mm
  • RS Stock No. 563-609
Each (In a Pack of 10)
HK$3.46
In Stock
Eaton 3A Ceramic Cartridge Fuse, 10 x 38mm
  • RS Stock No. 703-8213P
  • Mfr. Part No. PV-3A10F
Each (Supplied in a Box)
HK$423.07
Temporarily out of stock
Better World
Schneider Electric Busbar Tap-Off Unit with Circuit Breaker
  • RS Stock No. 219-8944
  • Mfr. Part No. KSB250DC4
Each
HK$16,097.03
In Stock
RS PRO 16A British Standard Fuse, A1, 550V ac, 44.5mm
  • RS Stock No. 521-2517
Each (In a Pack of 5)
HK$36.18
Temporarily out of stock
ABB 63A Tag Fuse, NH1, 500V
  • RS Stock No. 251-3472
  • Mfr. Part No. 1SCA022627R5110
1 Box of 3
HK$631.20
Temporarily out of stock
Wickmann 0.2A Resettable Fuse, 72 V dc, 72V ac
  • RS Stock No. 174-0443
  • Mfr. Part No. RF2564-000
1 Box of 10000
HK$18,908.60
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