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

50958 Products showing for Fuses & Circuit Breakers

695 of 999+
Bourns 2.5A Resettable Fuse, 15V
  • RS Stock No. 647-8099
  • Mfr. Part No. MF-SM250-2
Each (In a Pack of 10)
£0.239
Siemens SENTRON Undervoltage Release
  • RS Stock No. 277-0737
  • Mfr. Part No. 3WA9111-0AE06
Each
£223.64
Mersen 630mA F Glass Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 270-3109
  • Mfr. Part No. S090567
Each (In a Box of 10)
£0.539
Eaton xEffect MCB, 3P, 16A Curve C, 230 → 400V AC, 6 kA Breaking Capacity
  • RS Stock No. 769-4573
  • Mfr. Part No. 239148 FAZ6-C16/3
Each
£86.04
Schneider Electric Canalis 1 Phase Busbar, 230-400V
  • RS Stock No. 212-276
  • Mfr. Part No. KBA40ED2203W
1 Pack of 6
£667.02
Schneider Electric, ComPacT MCCB 4P 570A, Fixed Mount
  • RS Stock No. 260-8206
  • Mfr. Part No. C63F44V570
Each
£6,965.95
Better World
Siemens, SENTRON MCCB 3P 400A, Breaking Capacity 150 kA, Fixed Mount
  • RS Stock No. 249-672
  • Mfr. Part No. 3VA6440-8KM31-0AA0
Each
£3,493.05
Legrand RCBO, 2P, 45A, 250V AC
  • RS Stock No. 255-2313
  • Mfr. Part No. 401003
Each
£188.02
Allen Bradley 1492 1492-SPM MCB, 2P, 32A Curve C, 277V AC, 96V DC, 10 kA Breaking Capacity
  • RS Stock No. 125-1476
  • Mfr. Part No. 1492-SPM2C320
Each
£48.05
Schneider Electric RCBO, 25A Current Rating, 1P Poles, Type C, Acti9 Range
  • RS Stock No. 245-084
  • Mfr. Part No. A9D05825
Each
£155.78
ABB RCBO, 32A Current Rating, 1P+N Poles, 30mA Trip Sensitivity, Type B, System Pro M Compact Range
  • RS Stock No. 136-7781
  • Mfr. Part No. 2CSR275151R1325 DSE201 M B32 A30 - N Blue
Each
£103.00
Fuse - Strip 60 w/ Housing 48VDC, 150A
  • RS Stock No. 522-969
  • Mfr. Part No. 157.5701.6151
1 Pack of 50
£636.09
Siemens ALPHA Assembly Kit for use with 3VL Molded Case Circuit Breakers
  • RS Stock No. 629-253
  • Mfr. Part No. 8GK4721-4KK20
Each
£140.17
ABB Tmax XT Front Terminal for use with Tmax XT
  • RS Stock No. 237-6269
  • Mfr. Part No. 1SDA067182R1 FC CuAl 1x185 XT3 8PCS
Each
£105.19
Better World
Siemens, SENTRON MCCB 4P 20A, Breaking Capacity 36 kA, Fixed Mount
  • RS Stock No. 211-3721
  • Mfr. Part No. 3VA1120-4EE42-0AA0
Each
£241.01
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 600A, Breaking Capacity 35 kA, Fixed Mount
  • RS Stock No. 257-674
  • Mfr. Part No. 3VA5560-1MH32-0AA0
Each
£2,242.82
Siemens SENTRON 5SY Circuit Breaker, 2P, 500mA Curve C, 440V AC, 440V DC, 15 kA Breaking Capacity
  • RS Stock No. 664-341
  • Mfr. Part No. 5SY5205-7
Each
£172.49
Eaton xEffect MCB, 1+N, 6A Curve B
  • RS Stock No. 230-0921
  • Mfr. Part No. 239044 FAZ6-B6/1N
Each
£21.86
Schneider Electric A9R RCCB, 25A, 4 Pole, 300mA, Type A, 415V ac
  • RS Stock No. 335-372
  • Mfr. Part No. A9R24425
Each
£233.87
Bourns 1.6A Resettable Fuse, 30V
  • RS Stock No. 647-8550P
  • Mfr. Part No. MF-R160
Each (Supplied in a Bag)
£0.269
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