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

51057 Products showing for Fuses & Circuit Breakers

576 of 999+
Better World
Siemens SENTRON 5SL4 MCB, 3+N, 2A Curve D, 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 209-6537
  • Mfr. Part No. 5SL4602-8
Each
£143.78
ABB SN201 MCB, 1+N, 10A Curve D, 230V AC, 6 kA Breaking Capacity
  • RS Stock No. 186-3485
  • Mfr. Part No. 2CSS255102R0101
Each
£28.50
Better World
Siemens, SENTRON Circuit breaker 4P 400A, DIN Rail Mount
  • RS Stock No. 224-7917
  • Mfr. Part No. 3VA2340-5HN42-0AA0
Each
£2,576.67
Schurter PC Board Non Resettable Fuse, Radial 1A, 250V ac
  • RS Stock No. 173-9796
  • Mfr. Part No. 0034.6615
Each (In a Bag of 100)
£0.34
Better World
Siemens, SENTRON MCCB 4P 40A, Breaking Capacity 110 kA, Fixed Mount
  • RS Stock No. 270-4654
  • Mfr. Part No. 3VA2140-7HM42-0AA0
Each
£852.34
Siemens SENTRON 1 Phase Busbar, 18mm Pitch
  • RS Stock No. 213-2582
  • Mfr. Part No. 5ST3762
Each (In a Pack of 10)
£7.424
Better World
Siemens SENTRON Electronic Circuit Breaker 160A 3VA2, 4 channels
  • RS Stock No. 157-162
  • Mfr. Part No. 3VA2216-7KP42-0AA0
Each
£1,711.61
Schurter Thermal Circuit Breaker - T13 Single Pole 240V ac Voltage Rating, 20A Current Rating
  • RS Stock No. 284-6218
  • Mfr. Part No. 4411.0108
Each
£18.36
ABB, SACE Tmax XT MCCB Molded Case Circuit Breaker 3P 630A, Fixed Mount
  • RS Stock No. 231-9331
  • Mfr. Part No. 1SDA100355R1 XT5N 630 EkipDip LS/I 630
Each
£1,455.57
Better World
Schneider Electric Acti 9 iC60L MCB, 3P, 63A Curve B, 15 kA Breaking Capacity
  • RS Stock No. 219-9258
  • Mfr. Part No. A9F93363
Each
£293.98
Better World
Schneider Electric RCBO, 45A Current Rating, 1P+N Poles, 100mA Trip Sensitivity, Acti 9 Range
  • RS Stock No. 790-9386
  • Mfr. Part No. A9D12845
Each
£167.65
Eaton xPole MCB, 2P, 32A Curve C, 48V DC, 10 kA Breaking Capacity
  • RS Stock No. 864-4364
  • Mfr. Part No. 242408 PLSM-C32/2-MW
Each
£61.26
Better World
Schneider Electric Vigi iDT40 RCD, 40A, 3 Pole, 300mA, 400V
  • RS Stock No. 191-6152
  • Mfr. Part No. A9Y63740
Each
£290.33
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 800A, Breaking Capacity 35 kA, Fixed Mount
  • RS Stock No. 250-125
  • Mfr. Part No. 3VA6580-5JT36-0AA0
Each
£4,139.00
Littelfuse 300A Grey, White Fuse Strips Car Fuse, 48V dc
  • RS Stock No. 226-1033
  • Mfr. Part No. 157.5701.6301
Each
£6.27
Eaton 80A Offset Tag Fuse, 440V ac
  • RS Stock No. 182-1673
  • Mfr. Part No. XS80
Each
£63.08
Siemens SENTRON 5SJ4132 MCB, 1P, 32A Curve D, 400V AC, 60V DC, 10 kA Breaking Capacity
  • RS Stock No. 299-844
  • Mfr. Part No. 5SJ4132-8HG40
Each
£45.31
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 45A, Breaking Capacity 100 kA, Fixed Mount
  • RS Stock No. 269-705
  • Mfr. Part No. 3VA5245-7ED41-0AA0
Each
£788.04
Siemens, SENTRON MCCB 4P 225A, Breaking Capacity 18 kA, Fixed Mount
  • RS Stock No. 147-798
  • Mfr. Part No. 3VA5222-5ED41-2AA0
Each
£1,177.46
ABB RCBO, 10A Current Rating, 1P Poles, Type C
  • RS Stock No. 189-5647
  • Mfr. Part No. 2CSR245041R1104
Each
£70.71
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Distribution Boards Guide
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MCBs Guide
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