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

216 of 999+
Temporarily out of stock
Better World
Siemens SENTRON 5SL4 MCB, 3+N, 8A Curve C, 400V AC, 72V DC
  • RS Stock No. 209-7469
  • Mfr. Part No. 5SL4408-7
Each
HK$1,589.30
Temporarily out of stock
Eaton 40A 36 x 16mm Diazed Fuse, 400V ac
  • RS Stock No. 258-211
  • Mfr. Part No. 288944 Z-D02/SE-40
1 Pack of 12
HK$61.80
In Stock
Better World
Siemens Sentron 5SY4 MCB, 1P, 4A Curve D, 230V AC, 72V DC, 10 kA Breaking Capacity
  • RS Stock No. 772-1240
  • Mfr. Part No. 5SY4104-8
Each
HK$484.20
In Stock
Better World
Siemens Sentron 5SY4 MCB, 1P, 20A Curve D, 230V AC, 10 kA Breaking Capacity
  • RS Stock No. 772-1265
  • Mfr. Part No. 5SY4120-8
Each
HK$469.30
Temporarily out of stock
Eaton xEffect MCB, 4P, 3A Curve B
  • RS Stock No. 230-0907
  • Mfr. Part No. 177425 FAZ6-B3/4
Each
HK$941.57
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 63A, Breaking Capacity 85 kA, Fixed Mount
  • RS Stock No. 209-5180
  • Mfr. Part No. 3VA2163-6KP36-0AA0
Each
HK$14,977.50
In Stock
Better World
Siemens Sentron 5SY4 MCB, 2P, 1A Curve C, 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 124-3161
  • Mfr. Part No. 5SY4201-7
Each
HK$762.30
Temporarily out of stock
Better World
Siemens SENTRON 3VA1 MCB, 2P, 40A
  • RS Stock No. 224-7852
  • Mfr. Part No. 3VA1140-4ED26-0AA0
Each
HK$2,976.40
Temporarily out of stock
Better World
Siemens SENTRON 5SY4 MCB, 4P, 13A Curve C
  • RS Stock No. 216-4332
  • Mfr. Part No. 5SY4413-7
Each
HK$1,376.90
In Stock
ETA Thermal Circuit Breaker - 4130 Single Pole 240V Voltage Rating Panel Mount, 30A Current Rating
  • RS Stock No. 405-9208
  • Mfr. Part No. 4130-G211-K4M1-30A
Each
HK$486.80
Temporarily out of stock
Siemens SENTRON 5SJ MCB, 1P, 20A
  • RS Stock No. 232-2238
  • Mfr. Part No. 5SJ4120-7HG42
Each
HK$544.60
Temporarily out of stock
ABB System Pro M Compact S200M MCB, 3+N, 3A, Type Z, 400V AC, 125V DC, 15 kA Breaking Capacity
  • RS Stock No. 200-797
  • Mfr. Part No. 2CDS273103R0318
Each
HK$4,193.36
Temporarily out of stock
Better World
Siemens SENTRON 5SL4 MCB, 3P, 500mA Curve D, 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 209-6482
  • Mfr. Part No. 5SL4305-8
Each
HK$1,409.40
Temporarily out of stock
Siemens SENTRON 5SJ MCB, 1P, 16A
  • RS Stock No. 232-2231
  • Mfr. Part No. 5SJ4116-7HG40
Each
HK$436.50
Temporarily out of stock
Eaton xEffect FAZ MCB, 1P, 16A Curve D, 240V AC, 60V DC, 15 kA Breaking Capacity
  • RS Stock No. 248-696
  • Mfr. Part No. 102110 FAZ-D16/1-NA
1 Pack of 2
HK$1,042.10
In Stock
Nidec Components 3A Resettable Fuse, 30V
  • RS Stock No. 637-6476
  • Mfr. Part No. PRCP-R300-0-99
Each (In a Pack of 5)
HK$7.082
In Stock
Better World
Schneider Electric Multi 9 MCB Mini Circuit Breaker, 1P, 5A Curve B, 277V AC
  • RS Stock No. 256-6750
  • Mfr. Part No. M9F21105
Each
HK$859.80
Temporarily out of stock
Better World
ABB Emax2 Electronic Circuit Breaker 1kA 1SDA07, 3 channels
  • RS Stock No. 259-3079
  • Mfr. Part No. 1SDA070933R1
Each
HK$61,921.22
Temporarily out of stock
RS PRO SMD Non Resettable Fuse 25A, 250V
  • RS Stock No. 182-3991P
Each (Supplied in a Box)
HK$22.47
In Stock
ABB S202M Circuit Breaker, 2P, 6A Curve B, 440V AC, 500V DC, 10 kA Breaking Capacity
  • RS Stock No. 287-6362
  • Mfr. Part No. 2CDS272061R0065
Each
HK$1,268.52
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