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

137 of 999+
Better World
Schneider Electric Acti 9 iC60H MCB, 3P, 4A Curve C, 440V AC, 100 → 133V DC, 10 kA Breaking Capacity
  • RS Stock No. 791-3376
  • Mfr. Part No. A9F54304
Each
£129.67
Siemens SENTRON 5SY4220 Circuit Breaker, 2P, 20A Curve C, 400V AC, 60V DC, 15 kA Breaking Capacity
  • RS Stock No. 153-528
  • Mfr. Part No. 5SY4220-6
Each
£54.31
Better World
Schneider Electric Linergy Busbar, 690V, 64mm Pitch
  • RS Stock No. 212-0182
  • Mfr. Part No. GV3G364
Each
£32.89
Bourns 0.05A Resettable Fuse, 220V
  • RS Stock No. 167-4670
  • Mfr. Part No. CMF-RL50A-0
Each (In a Box of 300)
£0.304
Better World
Schneider Electric, ComPacT NSX MCCB 3P 125A, Fixed Mount
  • RS Stock No. 254-6344
  • Mfr. Part No. C16F3TM125
Each
£701.35
Allen Bradley 1492 1492-SPM MCB, 1P, 20A Curve B, 277V AC, 48V DC, 10 kA Breaking Capacity
  • RS Stock No. 125-1425
  • Mfr. Part No. 1492-SPM1B200
Each
£17.53
Eaton 32A Rail Mount Fuse Holder for A2 Fuse, 1P, 690V ac
  • RS Stock No. 221-689
  • Mfr. Part No. RS32PH
Each
£29.90
Better World
Siemens Sentron 5SY4 MCB, 1P, 40A Curve C, 230V AC, 10 kA Breaking Capacity
  • RS Stock No. 124-3153
  • Mfr. Part No. 5SY4140-7
Each
£20.68
ABB, SACE Tmax XT MCCB Molded Case Circuit Breaker 4P 160A, Fixed Mount
  • RS Stock No. 232-0253
  • Mfr. Part No. 1SDA067410R1 XT1C 160 TMD 160A FF
Each
£484.46
Schneider Electric Shunt Trip Shunt trip for use with ComPact NS630b → 1600, ComPact NS1600b → 3200
  • RS Stock No. 247-1856
  • Mfr. Part No. 33662
Each
£221.29
Phoenix Contact Electronic Device Circuit Breaker Electronic Circuit breaker 3A 24V PTCB, 1 channels , DIN Rail Mount
  • RS Stock No. 207-2804
  • Mfr. Part No. 2909904
Each
£45.47
ABB PS1 1 Phase Busbar, 400V ac, 17.5mm Pitch
  • RS Stock No. 489-6489
  • Mfr. Part No. 2CDL210001R1012
Each
£6.13
Eaton 1.5A F Glass Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 412-267
  • Mfr. Part No. TDC10-1.5A
Each (In a Pack of 10)
£0.355
TE Connectivity Thermal Circuit Breaker - W57 Single Pole 250V ac Voltage Rating, 20A Current Rating
  • RS Stock No. 782-7830
  • Mfr. Part No. W57-XB1A7A10-20
Each
£2.88
WISKA Earthing Nut
  • RS Stock No. 700-0827
  • Mfr. Part No. EN25
Each (In a Pack of 4)
£7.355
Eaton xEffect MCB, 1P, 40A Curve D, 240V AC, 48V DC, 10 kA Breaking Capacity
  • RS Stock No. 922-7052
  • Mfr. Part No. 278588 FAZ-D40/1
Each
£25.71
Eaton xEffect MCB, 2P, 16A Curve D, 240 → 415V AC, 10 kA Breaking Capacity
  • RS Stock No. 847-3529
  • Mfr. Part No. 278783 FAZ-D16/2
Each
£61.53
Siemens SENTRON Connecting Terminals for use with Busbar System
  • RS Stock No. 202-7256
  • Mfr. Part No. 5ST3768-3
Each (In a Pack of 10)
£9.181
Eaton Door Coupling Handle for use with EN60204, NA Type Circuit Breaker
  • RS Stock No. 178-8044
  • Mfr. Part No. 106133 PKZ0-XRH
Each
£60.42
Better World
ABB System Pro M Compact S200 MCB, 3P, 25A Curve C, 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 746-7778
  • Mfr. Part No. 2CDS253001R0254 S203-C25
Each
£61.98
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