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

50957 Products showing for Fuses & Circuit Breakers

95 of 999+
Better World
Siemens Sentron 5SY4 MCB, 1P, 10A Curve D, 230V AC, 10 kA Breaking Capacity
  • RS Stock No. 772-1252
  • Mfr. Part No. 5SY4110-8
Each
£19.77
Better World
Schneider Electric iID RCCB, 25A, 4 Pole, 300mA, 380 → 415V ac
  • RS Stock No. 806-7335
  • Mfr. Part No. A9R44425
Each
£179.36
Schneider Electric RCBO, 20A Current Rating, 1P Poles, 30mA Trip Sensitivity, Acti9 Range
  • RS Stock No. 222-8513
  • Mfr. Part No. SEE120B03
Each
£137.42
Lovato 32A Fuse Holder for 10 x 38mm Fuse, 3P, 690V ac
  • RS Stock No. 248-5511
  • Mfr. Part No. FB01B3N
Each
£22.57
Mersen 4A Slow-Blow Ceramic Cartridge Fuse, 8.5 x 31.5mm
  • RS Stock No. 247-2945
  • Mfr. Part No. X222959
1 Box of 10
£16.81
Better World
Siemens Sentron 5SY7 MCB, 1P, 6A Curve C, 230V AC, 15 kA Breaking Capacity
  • RS Stock No. 622-0200
  • Mfr. Part No. 5SY7106-7
Each
£24.71
Wickmann 30A Inline Fuse Holder, 32V dc
  • RS Stock No. 170-6112
  • Mfr. Part No. 0FHM0002ZXJ
Each
£6.73
Eaton 16A Panel Mount Fuse Holder for 5 x 20mm Fuse, 1P, 250V ac
  • RS Stock No. 852-7269
  • Mfr. Part No. HTB-28M-R
Each
£1.78
Wurth Elektronik 10A PCB Mount Fuse Holder for 5 x 20mm Fuse, 1P, 250V ac
  • RS Stock No. 893-0574
  • Mfr. Part No. 696101000002
Each (In a Pack of 10)
£0.564
Better World
Siemens Sentron 5SY4 MCB, 3P, 25A Curve C, 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 383-2147
  • Mfr. Part No. 5SY4325-7
Each
£80.14
Littelfuse 300A Grey, White CF Car Fuse, 58V dc
  • RS Stock No. 337-7993
  • Mfr. Part No. 155.0892.6301
Each
£9.85
RS PRO 18A Fuse Holder for 5 x 20mm Fuse, 1P, 250V ac
  • RS Stock No. 277-3903
Each (In a Pack of 5)
£0.598
Europa EUC1P EUC MCB, 1P, 4A Curve C, 230V AC, 10 kA Breaking Capacity
  • RS Stock No. 849-6490
  • Mfr. Part No. EUC1P4C
Each
£6.92
Allen Bradley 1492 1492-SPM MCB, 2P, 10A Curve C, 277V AC, 96V DC, 10 kA Breaking Capacity
  • RS Stock No. 125-1472
  • Mfr. Part No. 1492-SPM2C100
Each
£42.28
Better World
Schneider Electric Acti 9 iC60H MCB, 3P, 25A Curve B, 440V AC, 100 → 133V DC, 10 kA Breaking Capacity
  • RS Stock No. 791-3234
  • Mfr. Part No. A9F53325
Each
£109.54
Eaton 1A F Melamine Cartridge Fuse, 10 x 38mm
  • RS Stock No. 458-8504
  • Mfr. Part No. KTK-1
Each (In a Pack of 5)
£13.452
Eaton 160A British Standard Fuse, B2, 660V ac, 111mm
  • RS Stock No. 415-288
  • Mfr. Part No. TF160
Each
£94.05
Eaton 6A T Glass Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 852-7168
  • Mfr. Part No. MDL-6-R
Each
£1.32
Littelfuse 20A T Cartridge Fuse, 10 x 38mm
  • RS Stock No. 878-1580
  • Mfr. Part No. 0FLM020.T
Each
£10.61
TE Connectivity Thermal Circuit Breaker - W28 Single Pole 32 V dc, 250V ac Voltage Rating Panel Mount, 10A Current
  • RS Stock No. 167-5677
  • Mfr. Part No. W28-XQ1A-10
Each
£2.94
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Distribution Boards Guide
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MCBs Guide
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