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

52 of 999+
Siemens Sentron Series Connector for use with Busbar
  • RS Stock No. 228-8209
  • Mfr. Part No. 5ST3791-1
Each (In a Pack of 10)
HK$43.84
Siemens SENTRON Wire Connector for use with 3VA1 250
  • RS Stock No. 210-9323
  • Mfr. Part No. 3VA9213-0JJ13
Each
HK$885.40
Siemens SENTRON Wire Connector for use with 3VA1 400/630 and 3VA2 400/630
  • RS Stock No. 210-9387
  • Mfr. Part No. 3VA9403-0JC23
Each
HK$2,222.70
Siemens Sentron Series Connector for use with Busbar
  • RS Stock No. 228-8205
  • Mfr. Part No. 5ST3781-1
Each (In a Pack of 10)
HK$45.31
Siemens SENTRON 3VA9 Wire Connector for use with 3VA1 160
  • RS Stock No. 218-1794
  • Mfr. Part No. 3VA9114-0QE00
Each
HK$785.20
Siemens ALPHA Feeder Terminal for use with N Busbar
  • RS Stock No. 203-8790
  • Mfr. Part No. 8WA2868
Each (In a Pack of 50)
HK$14.836
Better World
Siemens SENTRON Wire Connector for use with 3VA2 100/160/250
  • RS Stock No. 210-9278
  • Mfr. Part No. 3VA9103-0JB11
Each
HK$279.50
Siemens SENTRON 3VA9 Cable for use with EFB300-3VA
  • RS Stock No. 218-1878
  • Mfr. Part No. 3VA9987-0UB10
Each
HK$423.60
Siemens SENTRON 3VA9 Cover for use with 3VA2 100/160/250
  • RS Stock No. 218-1822
  • Mfr. Part No. 3VA9221-0WG40
Each
HK$652.50
Siemens SENTRON Undervoltage Release for use with 3VA1 and 3VA20 up to 3VA25
  • RS Stock No. 218-1871
  • Mfr. Part No. 3VA9908-0BB26
Each
HK$1,423.70
Siemens SENTRON Control Wire Tap for 3VA1 400/630, 3VA2 400/630
  • RS Stock No. 226-2836
  • Mfr. Part No. 3VA9480-0WC00
Each (In a Pack of 10)
HK$89.12
Siemens SENTRON Mounting Plate for use with 3VA1 250
  • RS Stock No. 210-9319
  • Mfr. Part No. 3VA9211-0WJ40
Each
HK$249.90
Siemens SENTRON 3VA9 Adapter for use with 3VA1/2
  • RS Stock No. 218-1862
  • Mfr. Part No. 3VA9487-0GB10
Each
HK$231.90
Siemens SENTRON Wire Connector for use with 3VA2 100/160/250
  • RS Stock No. 210-9358
  • Mfr. Part No. 3VA9263-0JC22
Each
HK$1,135.20
Wickmann 200A Inline Fuse Holder, 32V dc
  • RS Stock No. 174-0633
  • Mfr. Part No. 04980921GXM5
1 Pack of 1
HK$58.30
Siemens Sentron Series Connector for use with Busbar
  • RS Stock No. 228-8206
  • Mfr. Part No. 5ST3782-0
Each (In a Pack of 10)
HK$44.82
TE Connectivity Thermal Circuit Breaker - W57 Single Pole 250V ac Voltage Rating, 10A Current Rating
  • RS Stock No. 782-0867
  • Mfr. Part No. W57-XB7A4A10-10
Each
HK$23.00
Better World
ABB, Protecta MCCB 3P 250A, Breaking Capacity 36 kA, DIN Rail Mount
  • RS Stock No. 831-9188
  • Mfr. Part No. 1SDA068059R1 XT3N 250 TMD 250-2500 3p F F
Each
HK$4,940.30
Phoenix Contact Electronic Device Circuit Breaker Electronic Circuit breaker 10A 24V CBMC, 1 channels , DIN Rail Mount
  • RS Stock No. 207-2719
  • Mfr. Part No. 2906032
Each
HK$1,061.70
Schneider Electric Easy9 Earth Terminal
  • RS Stock No. 850-8675
  • Mfr. Part No. EZ9EARTHKIT
Each
HK$32.40
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