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

232 of 999+
In Stock
Mersen 1kA size 33 FF Square Body Fuse, aR, 700V
  • RS Stock No. 304-2243
  • Mfr. Part No. B300082
Each
HK$2,896.90
In Stock
Schneider Electric RCBO, 10A Current Rating, 4P Poles, 30mA Trip Sensitivity, Type C, Acti9 Range
  • RS Stock No. 130-731
  • Mfr. Part No. A9D57410
Each
HK$9,147.34
Temporarily out of stock
Phoenix Contact Thermomagnetic Device Circuit Breaker Thermal Circuit Breaker - CB Single Pole 50V dc Voltage Rating,
  • RS Stock No. 212-8788
  • Mfr. Part No. 2800860
Each
HK$366.20
In Stock
Wickmann PC Board Non Resettable Fuse, Radial 1A, 125V ac
  • RS Stock No. 226-0800
  • Mfr. Part No. 3951100000
Each (In a Pack of 10)
HK$11.04
Temporarily out of stock
ABB S800B, S800C, S800N, S800S 2CCS MCB, 1P, 6A Curve D, 240V AC, 50 kA Breaking Capacity
  • RS Stock No. 140-889
  • Mfr. Part No. 2CCS861001R0061
Each
HK$1,713.71
Temporarily out of stock
Hager BF RCCB, 40A, 2P Pole, 300mA, Type A
  • RS Stock No. 602-185
  • Mfr. Part No. BF240
Each
HK$4,045.10
Temporarily out of stock
Siemens SENTRON Mounting Plate for use with 3VA2 100/160/250
  • RS Stock No. 210-9336
  • Mfr. Part No. 3VA9221-0WK30
Each
HK$231.90
In Stock
Siemens SIRIUS Cover for use with 3RB2, 3RT1, 3RW407, 3RW444
  • RS Stock No. 218-2896
  • Mfr. Part No. 3RT1966-4EA2
Each
HK$694.50
Temporarily out of stock
Siemens SENTRON Wire Connector for use with 3VA2 100/160/250
  • RS Stock No. 210-9365
  • Mfr. Part No. 3VA9264-0JF60
Each
HK$1,717.00
Temporarily out of stock
Siemens SENTRON Cover for use with 3VA1 250
  • RS Stock No. 210-9343
  • Mfr. Part No. 3VA9253-0KB03
Each
HK$225.20
Temporarily out of stock
Siemens SENTRON Wire Connector for use with 3VA1 160
  • RS Stock No. 210-9300
  • Mfr. Part No. 3VA9154-0JF60
Each
HK$1,717.00
Temporarily out of stock
Better World
Siemens SENTRON Wire Connector for use with 3VA5
  • RS Stock No. 269-7096
  • Mfr. Part No. 3VA9134-0JB10
Each (In a Pack of 4)
HK$75.40
Temporarily out of stock
Siemens SENTRON Wire Connector for use with 3VA2 100/160/250
  • RS Stock No. 210-9366
  • Mfr. Part No. 3VA9264-0QC00
Each
HK$1,011.30
Temporarily out of stock
Better World
Siemens Sentron for use with 3VA1 And 3VA20 Up To 3VA25
  • RS Stock No. 226-2844
  • Mfr. Part No. 3VA9988-0BL31
Each
HK$1,245.00
In Stock
Siemens SENTRON 3VA9 Cover for use with 3VA1 100/160
  • RS Stock No. 218-1778
  • Mfr. Part No. 3VA9111-0WD40
Each
HK$248.30
In Stock
Better World
Siemens SENTRON 3VA9 Cover for use with 3VA1 100/160
  • RS Stock No. 218-1780
  • Mfr. Part No. 3VA9111-0WF30
Each
HK$248.30
Temporarily out of stock
Siemens SENTRON Wire Connector for use with 3VA2 100/160/250
  • RS Stock No. 269-7169
  • Mfr. Part No. 3VA9263-0JG12
Each (In a Pack of 3)
HK$163.80
Temporarily out of stock
Siemens SENTRON Long Rear Connection for use with 3VA1 250
  • RS Stock No. 269-7119
  • Mfr. Part No. 3VA9213-0QF00
Each (In a Pack of 3)
HK$273.40
Temporarily out of stock
Siemens SENTRON 3VA9 Cover for use with 3VA2 100/160/250
  • RS Stock No. 218-1806
  • Mfr. Part No. 3VA9163-0KB05
Each
HK$481.90
Temporarily out of stock
Siemens SENTRON Wire Connector for use with 3VA1 160
  • RS Stock No. 210-9299
  • Mfr. Part No. 3VA9154-0JC12
Each
HK$1,106.70
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