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

2270 of 999+
Currently unavailable
Omron, Energy Sensor
  • RS Stock No. 215-4116
  • Mfr. Part No. KM1-PMU2A-FLK
Each
HK$8,119.60
In Stock
ABB System Pro M Compact SU200M MCB, 3P, 16A Curve C, 400V AC, 400V DC, 15 kA Breaking Capacity
  • RS Stock No. 231-9758
  • Mfr. Part No. 2CDS273337R0164 SU203M-C16
1 Box of 1
HK$1,373.90
Temporarily out of stock
Better World
ABB, Tmax XT MCCB 3P 160A, Fixed Mount
  • RS Stock No. 236-7539
  • Mfr. Part No. 1SDA067876R1 XT2H 160 Ekip LSIG 160A FF
Each
HK$14,854.46
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 630A, Breaking Capacity 110 kA, DIN Rail Mount
  • RS Stock No. 272-0180
  • Mfr. Part No. 3VA1563-7GF42-0AA0
Each
HK$36,081.60
Temporarily out of stock
Better World
Schneider Electric TeSys Thermal Circuit Breaker - TeSyS GV 3 Pole 690V ac Voltage Rating, 12.5A Current Rating
  • RS Stock No. 175-1468
  • Mfr. Part No. GV4LE12N
Each
HK$4,419.40
Temporarily out of stock
ABB System Pro M Compact S200 M UC MCB, 2P, 60A, Type Z, 400V AC, 440V DC, 10 kA Breaking Capacity
  • RS Stock No. 200-075
  • Mfr. Part No. 2CDS272061R0588
Each
HK$4,256.16
Temporarily out of stock
Schneider Electric TransferPacT Electronic Circuit Breaker 160A TAA160, Fixed
  • RS Stock No. 272-7584
  • Mfr. Part No. TA16D3L1604TPE
Each
HK$41,995.33
In Stock
ABB, Tmax XT MCCB 4P 125A, Fixed Mount
  • RS Stock No. 236-7280
  • Mfr. Part No. 1SDA067409R1 XT1C 160 TMD 125A FF
Each
HK$4,358.50
Temporarily out of stock
ABB SMISSLINE TP MCB, 2P, 3A Curve C, 440V AC
  • RS Stock No. 246-2605
  • Mfr. Part No. 2CCS572001R1034
Each
HK$1,687.51
Temporarily out of stock
Eaton PKE Electronic Circuit Breaker 32A
  • RS Stock No. 120-829
  • Mfr. Part No. 158245 PKE32/AK
Each
HK$713.61
Temporarily out of stock
Better World
Siemens RCBO, 20A Current Rating, 2P Poles, 30mA Trip Sensitivity, Sentron Range
  • RS Stock No. 151-1217
  • Mfr. Part No. 5SU1356-7KK20
Each
HK$1,170.30
Temporarily out of stock
Better World
ABB, Tmax XT MCCB 3P 80A, Fixed Mount
  • RS Stock No. 236-6585
  • Mfr. Part No. 1SDA068086R1 XT4N 160 TMA 80A FF
Each
HK$4,249.30
Temporarily out of stock
Better World
Siemens SENTRON Electronic Circuit Breaker 500A 3VA, 3 channels
  • RS Stock No. 155-836
  • Mfr. Part No. 3VA2450-0MQ32-0AA0
Each
HK$41,532.10
Temporarily out of stock
ABB, XT2S MCCB 3P 50A, Fixed Mount
  • RS Stock No. 236-7356
  • Mfr. Part No. 1SDA067555R1 XT2S 160 TMA 50A FF
Each
HK$3,232.30
Temporarily out of stock
Better World
Schneider Electric Multi 9 MCB Mini Circuit Breaker, 3P, 6A Curve C, 277V AC
  • RS Stock No. 256-6804
  • Mfr. Part No. M9F52306
Each
HK$2,934.40
Temporarily out of stock
Better World
Schneider Electric Acti 9 iC60N MCB, 3P, 40A Curve B, 440V AC, 180V DC, 6 kA Breaking Capacity
  • RS Stock No. 776-3418
  • Mfr. Part No. A9F76340
Each
HK$2,135.56
In Stock
Better World
Schneider Electric 250V ac Push Button Push Button
  • RS Stock No. 790-9184
  • Mfr. Part No. A9E18036
Each
HK$240.50
In Stock
Schneider Electric Cable Connection Kit for use with ComPact NS630b → 1600 Circuit Breaker
  • RS Stock No. 247-1850
  • Mfr. Part No. 33641
Each
HK$3,431.50
Temporarily out of stock
Eaton, Eaton Moeller series NZM MCCB Molded Case Circuit Breaker 4P 630A, Breaking Capacity 9 kA, Plug In
  • RS Stock No. 247-727
  • Mfr. Part No. 150400 NZMH3-4-VE630-T
Each
HK$55,599.58
Temporarily out of stock
ABB System Pro M Compact S300P MCB, 1+N, 25A Curve D, 240V AC, 72V DC, 25 kA Breaking Capacity
  • RS Stock No. 203-673
  • Mfr. Part No. 2CDS381103R0251
Each
HK$1,731.69
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