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

46578 Products showing for Fuses & Circuit Breakers

2313 / 999+
Better World
Siemens SENTRON 5SY4 MCB, 1P, 500mA Curve D, 400V AC, 72V DC, 5 kA Breaking Capacity
  • RS Stock No. 212-8823
  • Mfr. Part No. 5SY4105-8
Each
MYR256.81
ABB Emax2 Electronic Circuit Breaker 1.6kA 1SDA07, 4 channels
  • RS Stock No. 259-3673
  • Mfr. Part No. 1SDA071647R1
Each
MYR66,442.28
Phoenix Contact SOL-SC Wall Box, 20 A
  • RS Stock No. 239-5012
  • Mfr. Part No. 1016813
Each
MYR1,956.17
Better World
Siemens, SENTRON MCCB 4P 100A, Breaking Capacity 150 kA, Fixed Mount
  • RS Stock No. 270-4020
  • Mfr. Part No. 3VA2110-8HL42-0AA0
Each
MYR6,285.73
Schneider Electric, ComPacT MCCB 4P 630A, Fixed Mount
  • RS Stock No. 260-8254
  • Mfr. Part No. C63V42D630
Each
MYR30,494.91
Better World
Siemens, SENTRON MCCB 4P 80A, Breaking Capacity 25 kA, Fixed Mount
  • RS Stock No. 271-9619
  • Mfr. Part No. 3VA10803ED420AA0
Each
MYR2,140.70
Better World
ABB Emax2 Electronic Circuit Breaker 630A Ekip G Hi-Touch LSIG, 3 channels
  • RS Stock No. 259-9887
  • Mfr. Part No. 1SDA070720R1
Each
MYR44,768.55
Schurter PC Board Non Resettable Fuse 250mA, 125V ac/dc
  • RS Stock No. 865-7799
  • Mfr. Part No. 0034.4213
Each (In a Pack of 10)
MYR4.902
Mersen 125A Neutral Link for A4 Fuses
  • RS Stock No. 178-1173
  • Mfr. Part No. J239139 / BNEUTRALA4
Each (In a Pack of 10)
MYR24.441
Better World
ABB Emax2 Electronic Circuit Breaker 2.5kA 1SDA07, 3 channels
  • RS Stock No. 259-3207
  • Mfr. Part No. 1SDA071076R1
Each
MYR63,375.86
Bourns 250A Tag Fuse, 38mm, 800V ac/dc, 24.1mm
  • RS Stock No. 254-4148
  • Mfr. Part No. PF-FB2-250
Each (In a Box of 10)
MYR742.726
Better World
Siemens SENTRON MCB, 1+N, 4A Curve B, 230V AC
  • RS Stock No. 238-3181
  • Mfr. Part No. 5SL6004-6MC
Each
MYR884.19
Better World
Siemens, SENTRON MCCB 3P 40A, Breaking Capacity 85 kA, Fixed Mount
  • RS Stock No. 270-4628
  • Mfr. Part No. 3VA2140-6HM36-0AA0
Each
MYR6,033.40
Better World
Siemens, SENTRON MCCB 4P 63A, Breaking Capacity 85 kA, Fixed Mount
  • RS Stock No. 209-5113
  • Mfr. Part No. 3VA2063-6KP46-0AA0
Each
MYR8,466.48
Siemens 4A Centred Tag Fuse, NH000, 690V
  • RS Stock No. 210-6938
  • Mfr. Part No. 3NA7804-6
Each (In a Pack of 3)
MYR258.913
Better World
Siemens, SENTRON MCCB 4P 100A, Breaking Capacity 55 kA, Fixed Mount
  • RS Stock No. 209-4864
  • Mfr. Part No. 3VA1110-5EF42-0AA0
Each
MYR3,321.33
Siemens ALPHA Cover for use with ALPHA 630 DIN
  • RS Stock No. 229-9877
  • Mfr. Part No. 8GK9601-2KK20
Each (In a Pack of 10)
MYR213.583
ABB Emax2 Electronic Circuit Breaker 5kA 1SDA07, 4 channels
  • RS Stock No. 259-3889
  • Mfr. Part No. 1SDA071909R1
Each
MYR244,489.08
Better World
ABB Emax2 Electronic Circuit Breaker 1kA 1SDA07, 3 channels
  • RS Stock No. 259-9936
  • Mfr. Part No. 1SDA070799R1
Each
MYR45,055.72
Better World
Siemens SENTRON 5SY7 MCB, 1+N, 32A Curve B, 5 kA Breaking Capacity
  • RS Stock No. 216-6025
  • Mfr. Part No. 5SY7532-6
Each
MYR407.06
1
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