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

113 of 999+
Better World
Schneider Electric ComPact NSX Snap In Nut for use with Compact NSX 160/250
  • RS Stock No. 219-9368
  • Mfr. Part No. LV430554
Each
£46.69
Schurter 4A F Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 167-7774
  • Mfr. Part No. 0034.1522
Each (In a Pack of 10)
£0.325
ETA Thermal Circuit Breaker - 1610 Single Pole 12V Voltage Rating, 5A Current Rating
  • RS Stock No. 288-4021
  • Mfr. Part No. 1610-H2-5A
Each
£10.79
Schurter 2A F Ceramic Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 830-4265
  • Mfr. Part No. 8020.5071.G
Each (In a Pack of 10)
£0.613
Phoenix Contact Electronic Device Circuit Breaker Electronic Circuit breaker 3A 24V PTCB, 1 channels , DIN Rail Mount
  • RS Stock No. 207-2805
  • Mfr. Part No. 2909909
Each
£49.12
SIBA 10A Ceramic Cartridge Fuse, 10 x 38mm
  • RS Stock No. 736-1422
  • Mfr. Part No. 50-199-06/10A
Each
£13.76
Allen Bradley 140G Cover Frame for use with MCCBs
  • RS Stock No. 255-1641
  • Mfr. Part No. 140G-G-NVM21R
Each
£175.57
Better World
Siemens SENTRON 5SL MCB, 1+N, 16A Curve C
  • RS Stock No. 232-2277
  • Mfr. Part No. 5SL6016-7
Each
£36.53
ABB 16A Centred Tag Fuse, NH000, 500V
  • RS Stock No. 779-9940
  • Mfr. Part No. OFAF000H16 1SCA022627R0660
Each
£5.45
Better World
Schneider Electric Multi 9 C60SP MCB, 2P, 4A Curve D, 440V AC, 125V DC, 15 kA Breaking Capacity
  • RS Stock No. 211-2393
  • Mfr. Part No. M9F23204
Each
£93.14
Schurter 20mA F Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 870-1622
  • Mfr. Part No. 7010.3110
Each (In a Pack of 10)
£1.37
Europa EUC1P EUB MCB, 1P, 10A Curve B, 230V AC, 10 kA Breaking Capacity
  • RS Stock No. 849-6468
  • Mfr. Part No. EUC1P10B
Each
£7.91
Siemens 2A D01 Neozed Fuse, gG, 400V ac
  • RS Stock No. 622-0907
  • Mfr. Part No. 5SE2302
Each (In a Pack of 10)
£1.358
Eaton 30A F Melamine Cartridge Fuse, 10 x 38mm
  • RS Stock No. 848-4273
  • Mfr. Part No. KTK-R-30
Each
£29.64
Better World
Schneider Electric Multi 9 MCB Mini Circuit Breaker, 2P, 1A Curve B, 277V AC
  • RS Stock No. 256-6751
  • Mfr. Part No. M9F21201
Each
£91.29
ETI 63A Bottle Fuse Holder, 1P, 400V ac
  • RS Stock No. 289-8843
  • Mfr. Part No. 2232003
Each
£1.73
Better World
Siemens SENTRON 5SL4 MCB, 1P, 1A Curve C, 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 209-5958
  • Mfr. Part No. 5SL4101-7
Each
£21.26
Eaton 125A Ceramic Cartridge Fuse, 22 x 58mm
  • RS Stock No. 181-8876
  • Mfr. Part No. C22M125
Each
£2.01
RS PRO MCB, 2P, 2A Curve C, 240 → 415V AC, 10 kA Breaking Capacity
  • RS Stock No. 265-0182
Each
£21.28
Eaton 20A British Standard Fuse, E1, 240V ac
  • RS Stock No. 418-748
  • Mfr. Part No. SSD20
Each (In a Pack of 5)
£2.486
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