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

40 of 999+
Temporarily out of stock
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
Temporarily out of stock
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
Temporarily out of stock
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
Temporarily out of stock
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
Temporarily out of stock
Siemens SIRIUS Terminal for use with 3-Phase Busbar
  • RS Stock No. 272-0033
  • Mfr. Part No. 3RV19355A
Each
HK$147.00
Temporarily out of stock
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
Temporarily out of stock
Siemens SENTRON Conversion Kit for use with 3VA1 250
  • RS Stock No. 210-9324
  • Mfr. Part No. 3VA9213-0KP10
Each
HK$825.20
Temporarily out of stock
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
In Stock
Better World
RS PRO 10A F Ceramic Cartridge Fuse, 10 x 38mm
  • RS Stock No. 239-4973
Each (In a Pack of 10)
HK$57.46
Temporarily out of stock
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
Currently unavailable
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
In Stock
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
In Stock
nVent HOFFMAN Earth Bar
  • RS Stock No. 902-1306
  • Mfr. Part No. PGS4K
Each
HK$1,833.80
Temporarily out of stock
Better World
Siemens SENTRON Box Terminal for use with 3VA1 100/160
  • RS Stock No. 210-3516
  • Mfr. Part No. 3VA9154-0JA11
Each
HK$235.40
Temporarily out of stock
Better World
Siemens SENTRON 3VA9 Terminal for use with 3VA1 400/630, 3VA2 400/630
  • RS Stock No. 218-1861
  • Mfr. Part No. 3VA9483-0JA13
Each
HK$861.60
Temporarily out of stock
Siemens SENTRON Terminal for use with 3VA6 150/250
  • RS Stock No. 269-7109
  • Mfr. Part No. 3VA9143-0JH12
Each (In a Pack of 3)
HK$177.867
In Stock
Siemens SENTRON Wire Connector for use with 3VA1 400/630 and 3VA2 100/160/250/400/630 circuit breakers
  • RS Stock No. 210-9408
  • Mfr. Part No. 3VA9487-0GA80
Each
HK$258.40
Temporarily out of stock
Siemens SENTRON 3VA9 Cable for use with EFB300-3VA
  • RS Stock No. 218-1879
  • Mfr. Part No. 3VA9987-0UB30
Each
HK$409.60
In Stock
Littelfuse PC Board Non Resettable Fuse 3A, 125V ac/dc
  • RS Stock No. 738-3024P
  • Mfr. Part No. 0251003.MRT1L
Each (Supplied in a Bag)
HK$4.60
In Stock
Littelfuse SMD Non Resettable Fuse 3A, 32V
  • RS Stock No. 820-7054
  • Mfr. Part No. 0437003.WR
Each (In a Pack of 100)
HK$6.908
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