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

2248 of 999+
Mersen 80A Ceramic Cartridge Fuse, 22 x 58mm
  • RS Stock No. 188-7460
  • Mfr. Part No. Q217180
Each (In a Pack of 10)
HK$32.32
Better World
Siemens, SENTRON MCCB 4P 25A, Breaking Capacity 85 kA, Fixed Mount
  • RS Stock No. 270-3658
  • Mfr. Part No. 3VA2025-6JQ42-0AA0
Each
HK$33,381.70
Better World
ABB S200C MCB, 2P, 6A Curve C, 415V AC, 6 kA Breaking Capacity
  • RS Stock No. 212-1619
  • Mfr. Part No. 2CDS252280R0064
Each
HK$415.40
Schneider Electric PowerPact J Nut for use with Circuit Breaker
  • RS Stock No. 438-902
  • Mfr. Part No. S37444
1 Pack of 3
HK$1,064.80
Eaton xComfort KLV Distribution Board Enclosure
  • RS Stock No. 124-769
  • Mfr. Part No. 178801 KLV-24UPP-SF
Each
HK$1,398.68
Eaton 400A Centred Tag Fuse, 50.80 x 85.85mm, 600V ac
  • RS Stock No. 182-1361
  • Mfr. Part No. JKS-400
Each
HK$7,494.60
Better World
Siemens SENTRON Electronic Circuit Breaker 250A 3VA2, 4 channels
  • RS Stock No. 157-313
  • Mfr. Part No. 3VA2225-0HM42-0AA0
Each
HK$28,430.20
Socomec 50A Rail Mount Fuse Holder for 14 x 51mm Fuse, 2P, 690V
  • RS Stock No. 233-3332
  • Mfr. Part No. 57025012
Each (In a Pack of 3)
HK$648.493
Eaton 100A Tag Fuse, NH000, 500V ac
  • RS Stock No. 703-8651
  • Mfr. Part No. 100NHG000B
Each
HK$63.80
ABB S800U MCB, 3P, 15A Curve K, 240V AC, 50 kA Breaking Capacity
  • RS Stock No. 141-251
  • Mfr. Part No. 2CCS863017R0457
Each
HK$7,357.41
Eaton 315A Centred Tag Fuse, NH2, 690V ac
  • RS Stock No. 182-1761
  • Mfr. Part No. 315NHG2B-690
Each
HK$205.95
ABB SU200 M MCB, 3P, 32A, Type Z, 400V AC, 15 kA Breaking Capacity
  • RS Stock No. 201-224
  • Mfr. Part No. 2CDS273337R0538
Each
HK$3,587.94
Better World
Siemens, SENTRON MCCB 4P 100A, Breaking Capacity 55 kA, Fixed Mount
  • RS Stock No. 270-3536
  • Mfr. Part No. 3VA2010-5HM42-0AA0
Each
HK$21,639.40
Legrand RCD Switch, 10A Current Rating, 1P+N Poles, 30mA Trip Sensitivity, Type B, DX Range
  • RS Stock No. 731-9840
  • Mfr. Part No. 4 107 04
Each
HK$2,735.33
Socomec 40A F Cartridge Fuse, 22 x 58mm
  • RS Stock No. 223-2848
  • Mfr. Part No. 60630040
Each (In a Pack of 10)
HK$160.63
ABB S800U MCB, 1P, 25A Curve K, 240V AC, 30 kA Breaking Capacity
  • RS Stock No. 140-441
  • Mfr. Part No. 2CCS881017R0517
Each
HK$2,160.53
Littelfuse 2.5A Resettable Fuse, 16V dc
  • RS Stock No. 506-959P
  • Mfr. Part No. RUSBF250
Each (Supplied in a Bag)
HK$3.92
Eaton RCBO, 20A Current Rating, 2P Poles, 10mA Trip Sensitivity, Type D, FRBdM Range
  • RS Stock No. 120-972
  • Mfr. Part No. 168196 FRBDM-D20/2/001-G/A
Each
HK$2,045.68
Schneider Electric, PowerPact MCCB 3P 225A, Breaking Capacity 18 kA, DIN Rail Mount
  • RS Stock No. 346-695
  • Mfr. Part No. NJJL36225
Each
HK$42,796.05
Schneider Electric ComPacT NSX Trip Unit
  • RS Stock No. 256-4076
  • Mfr. Part No. C164TM160
Each
HK$7,619.32
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