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

58 of 999+
Temporarily out of stock
Siemens SENTRON Front Plate for use with 3VA1
  • RS Stock No. 269-7061
  • Mfr. Part No. 3VA9112-0SG20
Each (In a Pack of 5)
HK$21.96
In Stock
Siemens SENTRON Cover for use with 3VA1 100/160
  • RS Stock No. 210-9281
  • Mfr. Part No. 3VA9111-0WG30
Each
HK$377.60
Temporarily out of stock
Siemens SENTRON Nut Keeper Kit for use with 3VA5
  • RS Stock No. 269-7199
  • Mfr. Part No. 3VA9473-0QA00
Each (In a Pack of 3)
HK$235.80
Temporarily out of stock
Siemens SENTRON Handle Extension for use with 3VA1 400/630 3VA2 400/630 3VA5 400/600 3VA6 400/600
  • RS Stock No. 226-2839
  • Mfr. Part No. 3VA9487-0SC10
Each
HK$332.00
Temporarily out of stock
Siemens Insulating Plate for Use with 3VA1 400/630 3VA2 400/630
  • RS Stock No. 226-2837
  • Mfr. Part No. 3VA9481-0WJ30
Each
HK$243.40
Temporarily out of stock
Siemens SENTRON Wire Connector for use with 3VA4
  • RS Stock No. 269-7075
  • Mfr. Part No. 3VA9132-0JC12
Each (In a Pack of 2)
HK$365.50
Temporarily out of stock
Siemens SENTRON 3VA9 Rotary Handle for use with 3VA1 250
  • RS Stock No. 218-1835
  • Mfr. Part No. 3VA9257-0EK23
Each
HK$1,802.90
Temporarily out of stock
ABB IEC Range Busbar
  • RS Stock No. 250-4771
  • Mfr. Part No. 2CDL701001R0250
Each
HK$1,117.20
Temporarily out of stock
ABB Busbar for use with Miniature Circuit Breakers
  • RS Stock No. 250-4773
  • Mfr. Part No. 2CDL701301R1320
1 Box of 10
HK$544.40
Temporarily out of stock
Siemens SENTRON Cover Frame for use with Motor Operator
  • RS Stock No. 210-9382
  • Mfr. Part No. 3VA9387-0SB30
Each
HK$475.30
Temporarily out of stock
Siemens SENTRON 3VA9 Rotary Operator for use with 3VA15/25 1000
  • RS Stock No. 218-1867
  • Mfr. Part No. 3VA9687-0EK11
Each
HK$1,993.90
In Stock
Siemens Sirius Innovation Link Module for use with 3RV1 Series
  • RS Stock No. 218-848
  • Mfr. Part No. 3RA1911-1A
1 Box of 10
HK$1,856.60
In Stock
Siemens SIRIUS 3RV2 Feeder Terminal for use with 3RV2
  • RS Stock No. 218-1774
  • Mfr. Part No. 3RV2935-5E
Each
HK$776.50
Temporarily out of stock
ABB Busbar for use with Miniature Circuit Breakers
  • RS Stock No. 250-4774
  • Mfr. Part No. 2CDL701301R1500
1 Box of 10
HK$839.30
Temporarily out of stock
Siemens SENTRON Wire Connector for use with 3VA1 250
  • RS Stock No. 210-9346
  • Mfr. Part No. 3VA9253-0QC00
Each
HK$760.30
Temporarily out of stock
Siemens SENTRON 3VA9 Wire Connector for use with 3VA2 100/160/250
  • RS Stock No. 218-1823
  • Mfr. Part No. 3VA9223-0JJ13
Each
HK$885.40
Temporarily out of stock
Siemens SENTRON Wire Connector for use with 3VA1 400/630, 3VA2 400/630
  • RS Stock No. 269-7186
  • Mfr. Part No. 3VA9383-0JG13
Each (In a Pack of 3)
HK$518.10
Temporarily out of stock
Siemens SENTRON Wire Connector for use with 3VA2 100/160/250
  • RS Stock No. 210-9359
  • Mfr. Part No. 3VA9263-0JF60
Each
HK$1,297.50
Temporarily out of stock
Siemens SENTRON Connection Unit for use with 3VA1 400/630 3VA2 400/630
  • RS Stock No. 269-7209
  • Mfr. Part No. 3VA9483-0QD00
Each (In a Pack of 3)
HK$479.567
Temporarily out of stock
Siemens SENTRON Wire Connector for use with 3VA2 100/160/250
  • RS Stock No. 210-9364
  • Mfr. Part No. 3VA9264-0JC13
Each
HK$1,354.70
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