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

47265 Products showing for Fuses & Circuit Breakers

39 of 999+
Littelfuse 20A T Cartridge Fuse, 10 x 38mm
  • RS Stock No. 878-1580
  • Mfr. Part No. 0FLM020.T
Each
HK$114.20
Siemens SENTRON 3VA9 Cover for use with 3VA1 400/630, 3VA2 400/630
  • RS Stock No. 218-1849
  • Mfr. Part No. 3VA9354-0KB05
Each
HK$861.60
Siemens SENTRON Wire Connector for use with 3VA15/25 1000
  • RS Stock No. 269-7212
  • Mfr. Part No. 3VA9503-0JG32
Each (In a Pack of 3)
HK$643.167
Siemens SENTRON Wire Connector for use with 3VA5 250
  • RS Stock No. 269-7138
  • Mfr. Part No. 3VA9233-0JF60
Each (In a Pack of 3)
HK$343.833
Siemens SENTRON Wire Connector for use with 3VA15/25 1000
  • RS Stock No. 269-7234
  • Mfr. Part No. 3VA9604-0JC44
Each (In a Pack of 4)
HK$973.85
Siemens SENTRON Wire Connector for use with 3VA1
  • RS Stock No. 269-7065
  • Mfr. Part No. 3VA9113-0JG11
Each (In a Pack of 3)
HK$69.167
Littelfuse SMD Fuse Block 5A, 125V ac/dc
  • RS Stock No. 769-3716
  • Mfr. Part No. 0154005.DR
Each (In a Pack of 10)
HK$14.74
Siemens SENTRON Nut Keeper Kit for use with 3VA1
  • RS Stock No. 269-7120
  • Mfr. Part No. 3VA9213-0QG00
Each (In a Pack of 3)
HK$99.20
Siemens SENTRON Wire Connector for use with 3VA1 400/630 and 3VA2 400/630
  • RS Stock No. 210-9388
  • Mfr. Part No. 3VA9403-0JJ23
Each
HK$1,298.50
Better World
Siemens SENTRON Wire Connector for use with 3VA1 250
  • RS Stock No. 210-9347
  • Mfr. Part No. 3VA9254-0JB12
Each
HK$343.40
Better World
Siemens SENTRON Terminal for use with 3VA2 250
  • RS Stock No. 210-9362
  • Mfr. Part No. 3VA9264-0JA12
Each
HK$260.40
Siemens SENTRON Mounting Plate for use with 3VA2 100/160/250
  • RS Stock No. 210-9335
  • Mfr. Part No. 3VA9221-0WJ30
Each
HK$123.80
Siemens SIRIUS Terminal for use with 3-Phase Busbar
  • RS Stock No. 272-0033
  • Mfr. Part No. 3RV19355A
Each
HK$147.00
Siemens SENTRON 3VA9 Wire Connector for use with 3VA2 100/160/250
  • RS Stock No. 218-1825
  • Mfr. Part No. 3VA9224-0JF60
Each
HK$1,177.10
Siemens SENTRON Conversion Kit for use with 3VA1 250
  • RS Stock No. 210-9324
  • Mfr. Part No. 3VA9213-0KP10
Each
HK$825.20
Siemens SENTRON Auxiliary Switch Kit for use with Circuit Breaker 3VA4/5/6
  • RS Stock No. 272-0235
  • Mfr. Part No. 3VA9978-0AA12
Each
HK$235.40
ABB S800U MCB, 3P, 30A, Type Z, 240V AC, 50 kA Breaking Capacity
  • RS Stock No. 140-645
  • Mfr. Part No. 2CCS863017R0305
Each
HK$6,492.33
Eaton PC Board Non Resettable Fuse, Radial 1.25A, 300V ac
  • RS Stock No. 769-3292
  • Mfr. Part No. SR-5H-1-25A-BK
Each (In a Pack of 5)
HK$9.466
Littelfuse 0.25A Resettable Fuse, 240V dc
  • RS Stock No. 495-0735
  • Mfr. Part No. LVR025K
Each (In a Pack of 5)
HK$4.76
nVent HOFFMAN Earth Bar
  • RS Stock No. 902-1306
  • Mfr. Part No. PGS4K
Each
HK$1,833.80
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