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

46578 Products showing for Fuses & Circuit Breakers

202 / 999+
Eaton RCBO, 20A Current Rating, 3P Poles, 100mA Trip Sensitivity, Type A, Type C, FRBmM Range
  • RS Stock No. 123-293
  • Mfr. Part No. 170746 FRBMM-C20/3/01-A
Each
MYR1,040.18
Better World
ABB SN201 MCB, 1P, 4A Curve C, 230V AC, 10 kA Breaking Capacity
  • RS Stock No. 231-9970
  • Mfr. Part No. 2CSS255101R0044 SN201-C4 -
Each
MYR220.77
Littelfuse PCB Mount ATO Blade Fuse Block, 80V
  • RS Stock No. 787-4384
  • Mfr. Part No. 178.7017.0001
Each
MYR61.54
RS PRO RC Suppressor Circuit for use with Contactors
  • RS Stock No. 277-8528
Each
MYR227.03
Siemens Single Phase Industrial Surge Protection, 2A, 230V (Volts), DIN Rail Mount
  • RS Stock No. 266-9587
  • Mfr. Part No. 5SY1710-2
Each
MYR309.66
Mersen 500mA F Glass Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 270-3101
  • Mfr. Part No. R090566
Each (In a Box of 10)
MYR3.488
Phoenix Contact 1 Phase Surge Protector, 40kA, 2500V (Volts), DIN Rail Mount
  • RS Stock No. 131-654
  • Mfr. Part No. 2910365
Each
MYR1,335.37
Eaton RCBO, 40A Current Rating, 2P Poles, 100mA Trip Sensitivity, Type A, Type C, FRBm6 Range
  • RS Stock No. 123-338
  • Mfr. Part No. 170826 FRBM6-C40/2/01-A
Each
MYR907.39
Bulgin 10A Inline Fuse Holder for 6.3 x 25mm Fuse, 250V ac
  • RS Stock No. 408-410
  • Mfr. Part No. FX0285
Each (In a Pack of 5)
MYR53.964
HENSEL ENYBOARD Distribution Board, 63 A
  • RS Stock No. 117-311
  • Mfr. Part No. KV PC 9336
Each
MYR1,336.20
Better World
Schneider Electric Acti 9 Acti9 iDT40K MCB, 1+N, 20A Curve C, 230V AC
  • RS Stock No. 238-3413
  • Mfr. Part No. A9P71620
Each
MYR187.56
Eaton RCBO, 13A Current Rating, 2P Poles, 100mA Trip Sensitivity, Type A, Type B, FRBdM Range
  • RS Stock No. 121-024
  • Mfr. Part No. 168280 FRBDM-B13/1N/01-G/A
Each
MYR901.87
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 40A, Breaking Capacity 5 kA, Cable Mount, Panel Mount
  • RS Stock No. 148-623
  • Mfr. Part No. 3VA5140-4ED41-0AA0
Each
MYR2,497.47
Lovato 50A Base Mount Fuse Holder for 14 x 51mm Fuse, 1P, 690V ac
  • RS Stock No. 188-1622
  • Mfr. Part No. FB02A1P
Each
MYR94.77
Better World
Siemens, SENTRON MCCB 4P 63A, Breaking Capacity 85 kA, Fixed Mount
  • RS Stock No. 270-3845
  • Mfr. Part No. 3VA2063-6JP42-0AA0
Each
MYR9,499.37
Better World
Siemens, SENTRON MCCB 4P 32A, Breaking Capacity 25 kA
  • RS Stock No. 210-1651
  • Mfr. Part No. 3VA1132-3EF42-0AA0
Each
MYR2,112.68
Schneider Electric Flexible Busbar Trunking, 2.5m, 800A, Canalis Series
  • RS Stock No. 207-235
  • Mfr. Part No. KSA800EV4254
Each
MYR16,331.49
ABB System Pro M Compact S200 M UC MCB, 4P, 15A Curve K, 400V AC, 440V DC, 10 kA Breaking Capacity
  • RS Stock No. 201-100
  • Mfr. Part No. 2CDS274061R0457
Each
MYR3,531.70
Bourns Surface Mount Fuse 15A, 32V dc
  • RS Stock No. 245-9245
  • Mfr. Part No. SF-1206SA1500R-2
Each (On a Reel of 5000)
MYR2.921
Better World
Siemens SENTRON 3VA1 MCB, 1P, 125A
  • RS Stock No. 224-7799
  • Mfr. Part No. 3VA1112-4ED16-0AA0
Each
MYR1,745.40
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