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
Fuses - PCB
Fuses - PCB

50687 Products showing for Fuses & Circuit Breakers

36 of 999+
In Stock
RS PRO 40A British Standard Fuse, A3, 550V ac, 73.5mm
  • RS stock no. 521-2630
Each (In a Pack of 5)
R 218.562(exc. VAT)
In Stock
Mersen 2A Slow-Blow Ceramic Cartridge Fuse, 10 x 38mm
  • RS stock no. 247-2897
  • Mfr. Part No. S302788
1 Box of 10
R 1,803.07(exc. VAT)
Temporarily out of stock
Schneider Electric, ComPacT MCCB 3P 250A, Fixed Mount
  • RS stock no. 260-8032
  • Mfr. Part No. C25W32D250
Each
R 60,533.86(exc. VAT)
In Stock
Better World
Schneider Electric, ComPacT NSX MCCB 3P 80A, Fixed Mount
  • RS stock no. 254-6315
  • Mfr. Part No. C11F3TM080L
Each
R 8,993.42(exc. VAT)
In Stock
Better World
Schneider Electric TeSys Thermal Circuit Breaker - TeSyS GV 3 Pole 690V Voltage Rating DIN Rail Mount, 13A Current
  • RS stock no. 272-886
  • Mfr. Part No. GV3P13
Each
R 3,656.22(exc. VAT)
In Stock
Littelfuse PC Board Non Resettable Fuse, Axial 5A, 125V ac/dc
  • RS stock no. 541-3300
  • Mfr. Part No. 0251005.NRT1L
Each (In a Pack of 10)
R 26.697(exc. VAT)
In Stock
Hager 3 Phase Busbar
  • RS stock no. 144-4833
  • Mfr. Part No. KBN663A
Each
R 650.10(exc. VAT)
Being discontinued
RS PRO PC Board Non Resettable Fuse, Axial 4A, 250V ac
  • RS stock no. 764-9602
Each (In a Pack of 10)
R 11.49(exc. VAT)
Being discontinued
RS PRO 160mA T Glass Cartridge Fuse, 5 x 20mm
  • RS stock no. 563-586
Each (In a Pack of 10)
R 9.37(exc. VAT)
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 320A, Breaking Capacity 55 kA
  • RS stock no. 209-7033
  • Mfr. Part No. 3VA1463-5EF32-0AA0
Each
R 32,261.58(exc. VAT)
In Stock
Mersen 2A Ceramic Cartridge Fuse, 10 x 38mm
  • RS stock no. 188-6956
  • Mfr. Part No. D213098
Each (In a Pack of 10)
R 33.103(exc. VAT)
In Stock
Better World
ABB System Pro M Compact S200 MCB, 1P, 10A, Type Z, 253V AC, 72V DC, 20 kA Breaking Capacity
  • RS stock no. 225-5995
  • Mfr. Part No. 2CDS251001R0428 S201 Z 10A - 10 KA
Each
R 864.96(exc. VAT)
In Stock
Mersen 16A Slow-Blow Ceramic Cartridge Fuse, 8.5 x 31.5mm
  • RS stock no. 247-2956
  • Mfr. Part No. Y214105
1 Box of 10
R 404.34(exc. VAT)
In Stock
Eaton PC Board Non Resettable Fuse, Radial 1A, 250V ac
  • RS stock no. 769-3375
  • Mfr. Part No. SS-5F-1A-BK
Each (In a Pack of 5)
R 22.046(exc. VAT)
In Stock
Littelfuse PC Board Non Resettable Fuse, Axial 5A, 125V ac/dc
  • RS stock no. 541-3192
  • Mfr. Part No. 473005.YRT1L
Each (In a Pack of 10)
R 33.633(exc. VAT)
In Stock
Eaton 100A British Standard Fuse, B1, 415V, 111mm
  • RS stock no. 181-8746
  • Mfr. Part No. CD100M160
Each
R 773.53(exc. VAT)
In Stock
Schurter PC Board Non Resettable Fuse, Radial 500mA, 250V ac
  • RS stock no. 284-5300
  • Mfr. Part No. 0034.6612
Each (In a Pack of 10)
R 8.527(exc. VAT)
In Stock
Better World
Schneider Electric Acti 9 iC60H MCB, 2P, 63A Curve C, 440V AC, 100 → 133V DC, 10 kA Breaking Capacity
  • RS stock no. 791-3366
  • Mfr. Part No. A9F54263
Each
R 2,448.26(exc. VAT)
Temporarily out of stock
Better World
Schneider Electric iID RCCB, 40A, 2 Pole, 30mA
  • RS stock no. 734-9349
  • Mfr. Part No. A9R11240
Each
R 3,035.62(exc. VAT)
In Stock
Eaton xPole MCB, 1P, 32A Curve C, 230V AC, 48V DC, 10 kA Breaking Capacity
  • RS stock no. 864-4324
  • Mfr. Part No. 242209 PLSM-C32-MW
Each
R 544.50(exc. VAT)
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