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

626 of 999+
Better World
Siemens, SENTRON MCCB 4P 40A, Breaking Capacity 36 kA, Fixed Mount
  • RS Stock No. 211-3736
  • Mfr. Part No. 3VA1140-4EF46-0AA0
Each
£287.27
Eaton, Eaton Moeller series NZM MCCB Molded Case Circuit Breaker 3P 250A, Breaking Capacity 7.5 kA, Plug In
  • RS Stock No. 230-975
  • Mfr. Part No. 110285 NZMN2-A250-BT
Each
£1,234.69
Schurter SMD Non Resettable Fuse 4A, 125 V dc, 63V ac
  • RS Stock No. 600-7372
  • Mfr. Part No. 3410.0240.01
Each (In a Pack of 20)
£2.484
Siemens SENTRON Adapter for use with Busbar System
  • RS Stock No. 211-3866
  • Mfr. Part No. 8US1998-2BH02
Each (In a Pack of 12)
£6.383
Eaton 10A Slow-Blow Cartridge Fuse, 14 x 51mm
  • RS Stock No. 229-196
  • Mfr. Part No. C14M10 CYLINDRICAL FUSE 14 x 51 10A AM 690V AC
1 Pack of 10
£14.34
Schneider Electric Cross Elbow Busbar Trunking, 290 → 1200mm, 1000A, Canalis Series
  • RS Stock No. 334-986
  • Mfr. Part No. KSA1000DZE43F
Each
£3,648.72
Eaton xEffect FAZ MCB, 1P, 40A Curve D, 240V AC, 60V DC, 15 kA Breaking Capacity
  • RS Stock No. 240-568
  • Mfr. Part No. 102156 FAZ-D40/1-RT
Each
£70.24
Eaton 35A DIII Bottle Fuse, 500V
  • RS Stock No. 228-741
  • Mfr. Part No. 35D33 FUSE-D3 35A T GL/GG 500VAC E33
1 Pack of 5
£8.48
Better World
Siemens, SENTRON MCCB 4P 100A, Breaking Capacity 110 kA, Fixed Mount
  • RS Stock No. 270-4003
  • Mfr. Part No. 3VA2110-7KQ42-0AA0
Each
£1,484.86
Better World
Schneider Electric Acti 9 iC60H MCB, 1P, 1A Curve D, 100 → 133V AC, 72V DC, 10 kA Breaking Capacity
  • RS Stock No. 791-3451
  • Mfr. Part No. A9F55101
Each
£38.22
Better World
Siemens Sentron 5SY4 MCB, 2P, 32A Curve C, 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 772-1347
  • Mfr. Part No. 5SY4232-7
Each
£57.12
Schurter SMD Non Resettable Fuse 3.15A, 125 V dc, 250V ac
  • RS Stock No. 173-8013
  • Mfr. Part No. 3403.0171.24
1 Reel of 2000
£968.95
Siemens SENTRON 3 Phase Busbar, 18mm Pitch
  • RS Stock No. 202-7131
  • Mfr. Part No. 5ST3738
Each
£11.09
ABB S202L MCB, 2P, 16A Curve C, 400V AC, 6 kA Breaking Capacity
  • RS Stock No. 200-325
  • Mfr. Part No. 2CDS242701R0164
Each
£28.79
Siemens 63A Base Mount Fuse Holder for D02 Fuse, 3P, 400V
  • RS Stock No. 156-053
  • Mfr. Part No. 5SG6208
1 Pack of 6
£140.35
Eaton 16A 36 x 11mm Diazed Fuse, 400V ac
  • RS Stock No. 258-699
  • Mfr. Part No. 288939 Z-D01/SE-16
1 Pack of 12
£3.32
Schurter Thermal Circuit Breaker - T12 Single Pole 240V ac Voltage Rating, 12A Current Rating
  • RS Stock No. 173-9841
  • Mfr. Part No. 4410.0019
Each (In a Box of 20)
£19.015
Schneider Electric, PowerPact MCCB 2P 25A, Breaking Capacity 35 kA, Clip-On
  • RS Stock No. 341-570
  • Mfr. Part No. BGF26025
Each
£570.94
Eaton 3.5A Resettable Fuse, 6V
  • RS Stock No. 225-8255
  • Mfr. Part No. PTSLR12066V350
1 Reel of 2500
£670.59
Mersen 30A T Fibreglass Cartridge Fuse, 10 x 38mm
  • RS Stock No. 914-4389
  • Mfr. Part No. ATQR30
Each
£22.93
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