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

54 of 999+
In Stock
Bulgin 13A Panel Mount Fuse Holder for 6.3 x 25mm Fuse, 1P, 250V ac
  • RS Stock No. 408-397
  • Mfr. Part No. FX0416
Each
HK$85.70
In Stock
Schurter 10A Panel Mount Fuse Holder for 5 x 20mm Fuse, 1P, 250V ac
  • RS Stock No. 419-088
  • Mfr. Part No. 0031.3901
Each (In a Pack of 5)
HK$41.46
In Stock
Eaton 400A Rail Mount Fuse Holder, 1P, 460 V dc, 660 → 690V ac
  • RS Stock No. 182-1385
  • Mfr. Part No. RS400H
Each
HK$27,681.10
Limited stock
Panasonic SMD Non Resettable Fuse 5A, 32V dc
  • RS Stock No. 759-4795
  • Mfr. Part No. ERBRE5R00V
Each (In a Pack of 10)
HK$1.76
Temporarily out of stock
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
Temporarily out of stock
Phoenix Contact CAPAROC Electronic Circuit Breaker 4A 12 → 24V E1 12-24DC, 1 channels , Plug-On
  • RS Stock No. 269-7940
  • Mfr. Part No. 1115415
Each
HK$458.00
In Stock
ABB Busbar for use with Miniature Circuit Breakers
  • RS Stock No. 250-4772
  • Mfr. Part No. 2CDL701301R0320
1 Box of 10
HK$453.10
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
Temporarily out of stock
Schneider Electric RCBO, 16A Current Rating, 2P Poles, 30mA Trip Sensitivity, Type AC, Acti9 Range
  • RS Stock No. 276-8718
  • Mfr. Part No. A9D07216
Each
HK$4,501.39
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
Better World
ABB System Pro M Compact S200M MCB, 2P, 20A Curve C, 440V AC, 125V DC, 10 kA Breaking Capacity
  • RS Stock No. 132-116
  • Mfr. Part No. 2CDS272001R0204 S202M-C20
Each
HK$506.20
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
Temporarily out of stock
Siemens SENTRON Connection Unit for use with 3VA15/25 1000
  • RS Stock No. 269-7227
  • Mfr. Part No. 3VA9603-0QC00
Each (In a Pack of 3)
HK$1,025.633
In Stock
Siemens SENTRON Wire Connector for use with 3VA1 100/160
  • RS Stock No. 210-9298
  • Mfr. Part No. 3VA9153-0QC00
Each
HK$694.40
Temporarily out of stock
Siemens SENTRON 3VA9 Mounting Frame for use with 3VA2 100/160/250
  • RS Stock No. 218-1809
  • Mfr. Part No. 3VA9163-0SB20
Each
HK$409.20
Temporarily out of stock
Siemens SENTRON Connection Unit for use with 3VA2 100/160/250
  • RS Stock No. 269-7170
  • Mfr. Part No. 3VA9263-0QD00
Each (In a Pack of 3)
HK$159.633
Temporarily out of stock
Siemens SENTRON Cover Frame for use with Motor Operator
  • RS Stock No. 210-9355
  • Mfr. Part No. 3VA9257-0SB30
Each
HK$379.70
Temporarily out of stock
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
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