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

167 of 999+
RS PRO 15A Inline Fuse Holder for 6x30/6.35x32mm Fuse, 500V ac/dc
  • RS Stock No. 237-5260
Each
£5.26
Better World
Schneider Electric Acti 9 Acti9 iDT40K MCB, 1+N, 6A Curve C, 230V AC
  • RS Stock No. 238-3410
  • Mfr. Part No. A9P71606
Each
£32.68
RS PRO 4A T Ceramic Cartridge Fuse, 5 x 20mm
  • RS Stock No. 610-9800
Each (In a Pack of 10)
£0.474
Bulgin 10A Panel Mount Fuse Holder for 5 x 20mm Fuse, 1P, 250V ac
  • RS Stock No. 376-6573
  • Mfr. Part No. FX0367/1
Each (In a Pack of 5)
£1.048
Mersen 63A DIII Diazed Fuse, E33 Thread Size, gG, 500V
  • RS Stock No. 377-0522
  • Mfr. Part No. R215088
Each (In a Pack of 5)
£2.134
Bourns Single, Three Phase Surge Protector, 50kA, 1kV, DIN Rail Mount
  • RS Stock No. 287-9618
  • Mfr. Part No. 1250A-1S-230
Each
£117.85
Littelfuse 500mA T Glass Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 541-2997
  • Mfr. Part No. 0313.500MXP
Each (In a Pack of 10)
£0.935
Mersen 16A Ceramic Cartridge Fuse, 14 x 51mm
  • RS Stock No. 188-7303
  • Mfr. Part No. A211554
Each (In a Pack of 10)
£2.263
ETA REX12 Electronic Circuit breaker 1A 24V REX12-T, 1 channels , DIN Rail Mount
  • RS Stock No. 175-0363
  • Mfr. Part No. REX12-TA1-107-DC24V-1A
Each
£37.95
WAGO Electronic Circuit Breaker 10A 24V 787, 4 channels , DIN Rail
  • RS Stock No. 279-4097
  • Mfr. Part No. 787-1664
Each
£161.81
Eaton 12A Ceramic Cartridge Fuse, 10 x 38mm
  • RS Stock No. 703-8235P
  • Mfr. Part No. PV-12A10F
Each (Supplied in a Box)
£9.97
SIBA 1.6A T Ceramic Cartridge Fuse, 5 x 20mm
  • RS Stock No. 783-3305
  • Mfr. Part No. 70-007-65/1.6A
Each (In a Pack of 10)
£0.568
Schneider Electric RCBO, 20A Current Rating, 4P Poles, 300mA Trip Sensitivity, Type C, Acti9 Range
  • RS Stock No. 130-733
  • Mfr. Part No. A9D55420
Each
£574.80
TE Connectivity Thermal Circuit Breaker - W58 Single Pole 50 V dc, 250V ac Voltage Rating, 6A Current Rating
  • RS Stock No. 782-8038
  • Mfr. Part No. W58-XB1A4A-6
Each
£6.61
Allen Bradley 1492 1492-SPM MCB, 3P, 8A Curve C, 277V AC, 10 kA Breaking Capacity
  • RS Stock No. 125-1484
  • Mfr. Part No. 1492-SPM3C080
Each
£63.21
Eaton 200A Rail Mount Fuse Holder for B2 Fuse, 1P, 690V ac
  • RS Stock No. 415-092
  • Mfr. Part No. RS200H
Each
£229.22
ABB System Pro M Compact S200MUC MCB, 2P, 6A Curve C, 440V AC, 500V DC, 25 kA Breaking Capacity
  • RS Stock No. 231-9732
  • Mfr. Part No. 2CDS272061R0064 S202 MUC C 6A 10 KA
1 Box of 1
£201.39
Siemens 25A NH Fuse, NH000, 500V ac
  • RS Stock No. 269-8336
  • Mfr. Part No. 3ND1810
Each (In a Pack of 3)
£10.787
Better World
Schneider Electric RCBO, 32A Current Rating, 3P+N Poles, 30mA Trip Sensitivity, Type C, Acti9 Range
  • RS Stock No. 238-3289
  • Mfr. Part No. A9DK1732
Each
£397.42
Better World
Siemens SENTRON 5SY6 MCB, 4P, 16A Curve C, 400V AC, 72V DC, 5 kA Breaking Capacity
  • RS Stock No. 213-1082
  • Mfr. Part No. 5SY6416-7
Each
£109.34
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Our fuses guide explains what they are, what they are used for, how they work, and the different types available.
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Distribution Boards Guide
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MCBs Guide
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