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

2262 of 999+
Temporarily out of stock
ABB System Pro M Compact S200 M UC MCB, 2P, 10A Curve B, 400V AC, 440V DC, 10 kA Breaking Capacity
  • RS Stock No. 200-057
  • Mfr. Part No. 2CDS272061R0105
Each
HK$2,440.17
Temporarily out of stock
Better World
ABB, XT2V MCCB 4P 160A, Fixed Mount
  • RS Stock No. 236-7453
  • Mfr. Part No. 1SDA067715R1 XT2V 160 TMA 160A FF
Each
HK$11,888.45
In Stock
ABB RCBO, 25A Current Rating, 4P Poles, Type B
  • RS Stock No. 237-5101
  • Mfr. Part No. 2CSR254001R1255
Each
HK$3,134.40
Temporarily out of stock
Better World
Schneider Electric Acti 9 iC60N MCB, 25A Curve C, 240V AC, 72V DC, 6 kA Breaking Capacity
  • RS Stock No. 776-3525
  • Mfr. Part No. A9F77625
Each
HK$973.05
Temporarily out of stock
ABB S303 MCB, 3P, 25A Curve K, 415V AC, 125V DC, 100 kA Breaking Capacity
  • RS Stock No. 204-279
  • Mfr. Part No. 2CDS383001R0517
Each
HK$3,044.74
Temporarily out of stock
Siemens SENTRON 4 Phase Busbar
  • RS Stock No. 187-5212
  • Mfr. Part No. 5ST3746-5
Each
HK$1,447.00
In Stock
Eaton 6A F Melamine Cartridge Fuse, 10 x 38mm
  • RS Stock No. 851-1208
  • Mfr. Part No. KTK-6
Each
HK$295.00
Temporarily out of stock
ABB System Pro M Compact S300P MCB, 1+N, 13A Curve C, 240V AC, 72V DC, 25 kA Breaking Capacity
  • RS Stock No. 204-468
  • Mfr. Part No. 2CDS381103R0134
Each
HK$1,550.91
Temporarily out of stock
Siemens 230V ac Control Station Switch
  • RS Stock No. 622-0676
  • Mfr. Part No. 5TT4104-0
Each
HK$585.50
Temporarily out of stock
Eaton 40A NH Fuse, NH000, 690V ac
  • RS Stock No. 181-8628
  • Mfr. Part No. 40NHM000B-690
Each
HK$96.49
In Stock
Schneider Electric Acti9 A9F MCB, 2P, 500mA Curve C, 415V AC, 125V DC, 15 kA Breaking Capacity
  • RS Stock No. 288-7099
  • Mfr. Part No. A9F94270
Each
HK$3,686.31
Temporarily out of stock
ABB S800C MCB, 2P, 40A Curve C, 240V AC, 25 kA Breaking Capacity
  • RS Stock No. 140-455
  • Mfr. Part No. 2CCS882001R0404
Each
HK$2,205.25
Temporarily out of stock
Eaton Phase Busbar 2 Phase Busbar, 277V
  • RS Stock No. 231-539
  • Mfr. Part No. 121982 BB-UL-18/2P-2M/56
Each
HK$729.70
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 70A, Breaking Capacity 65 kA, Fixed Mount
  • RS Stock No. 269-573
  • Mfr. Part No. 3VA5270-6EC31-2AA0
Each
HK$9,291.40
Temporarily out of stock
Better World
Siemens SENTRON 5SY7 MCB, 1P, 10A Curve D, 15 kA Breaking Capacity
  • RS Stock No. 203-2287
  • Mfr. Part No. 5SY7110-8
Each
HK$314.00
Temporarily out of stock
Better World
ABB, Tmax XT MCCB 4P 125A, Fixed Mount
  • RS Stock No. 236-6646
  • Mfr. Part No. 1SDA068225R1 XT3S 250 TMD 125A 3P+N FF
Each
HK$7,831.30
In Stock
Bourns 1.5A Resettable Fuse, 15V
  • RS Stock No. 691-7591P
  • Mfr. Part No. MF-SMDF150-2
Each (Supplied on a Reel)
HK$3.60
Temporarily out of stock
Better World
Schneider Electric MCCB 2P 5A, Clip-On
  • RS Stock No. 178-8000
  • Mfr. Part No. LV426850
Each
HK$1,170.97
In Stock
Eaton 3 Phase Surge Protector, 15kA, 110 → 230 V dc, 110 → 415V ac, DIN Rail Mount
  • RS Stock No. 847-3677
  • Mfr. Part No. 102036 FAZ-XAA-NA110-415VAC
Each
HK$372.50
Temporarily out of stock
Better World
Siemens RCBO, 10A Current Rating, 2P Poles, 30mA Trip Sensitivity, Sentron Range
  • RS Stock No. 225-8755
  • Mfr. Part No. 5SU1354-7LB10
Each
HK$1,814.60
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