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

2237 of 999+
Schneider Electric, ComPacT MCCB 4P 25A, Fixed Mount
  • RS Stock No. 260-9412
  • Mfr. Part No. C10B4TM025
Each
HK$5,927.92
Bourns 3.5A Resettable Fuse, 30V
  • RS Stock No. 817-1719
  • Mfr. Part No. MF-S350
Each (In a Pack of 10)
HK$4.03
FUSE 250V IEC TL LBC TR5 SL 1.25A
  • RS Stock No. 552-456
  • Mfr. Part No. 37211250411
1 Bag of 100
HK$950.25
Siemens, SENTRON MCCB 4P 600A, Breaking Capacity 35 kA, Fixed Mount
  • RS Stock No. 249-766
  • Mfr. Part No. 3VA6560-5JQ46-0AA0
Each
HK$59,096.60
Better World
Siemens, SENTRON MCCB 4P 100A, Breaking Capacity 55 kA, Fixed Mount
  • RS Stock No. 270-3541
  • Mfr. Part No. 3VA2010-5JP46-0AA0
Each
HK$28,181.50
Eaton 16A Bottle Fuse, 500V
  • RS Stock No. 228-624
  • Mfr. Part No. 16D27R FUSE D2 16A 500 VAC F GR E27
1 Pack of 5
HK$307.40
SIBA 63A NH Fuse, NH000, 500V ac
  • RS Stock No. 421-564
  • Mfr. Part No. 20-000-04/63A
Each
HK$240.60
Schneider Electric Acti9 iID RCCB, 80A, 2 Pole, 300mA, Type AC, 220 → 240V ac
  • RS Stock No. 130-499
  • Mfr. Part No. A9R15280
Each
HK$6,689.19
Better World
ABB, Tmax XT MCCB 4P 10A, Fixed Mount
  • RS Stock No. 236-6533
  • Mfr. Part No. 1SDA068004R1 XT2V 160 Ekip LS/I 10A FF
Each
HK$11,949.00
Better World
Schneider Electric Acti 9 C60-PV MCB, 2P, 10A Curve B, 800V DC, 3 kA Breaking Capacity
  • RS Stock No. 776-3616
  • Mfr. Part No. A9N61650
Each
HK$1,977.70
SENTRON Cover Frame for use with 3VA63/64 Series
  • RS Stock No. 263-660
  • Mfr. Part No. 3VA9344-0SB20
Each
HK$764.70
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 40A, Breaking Capacity 35 kA, Fixed Mount
  • RS Stock No. 268-488
  • Mfr. Part No. 3VA6140-5KL41-2AA0
Each
HK$19,168.70
RCBO, 40A Current Rating, 1+N Poles, 300mA Trip Sensitivity, Type C, xEffect Range
  • RS Stock No. 252-761
  • Mfr. Part No. 193508 FRBmM-C40/1N/03-F
Each
HK$2,008.95
Better World
Schneider Electric Acti 9 C120H MCB, 4P, 100A Curve D
  • RS Stock No. 248-3683
  • Mfr. Part No. A9N18524
Each
HK$9,856.20
Better World
Schneider Electric Acti 9 iC60N MCB, 2P, 25A Curve C, 100 → 130V AC, 12 → 144V DC, 6 kA Breaking Capacity
  • RS Stock No. 734-9144
  • Mfr. Part No. A9F77225
Each
HK$802.53
Better World
Siemens, SENTRON MCCB 4P 63A, Breaking Capacity 55 kA, Fixed Mount
  • RS Stock No. 211-3791
  • Mfr. Part No. 3VA2163-5HL46-0AA0
Each
HK$7,111.40
Schneider Electric, ComPacT MCCB 2P 16A, Breaking Capacity 5 kA, Fixed Mount
  • RS Stock No. 346-752
  • Mfr. Part No. C10F2TM016
Each
HK$5,814.05
Eaton 250A Cartridge Fuse, 2.66 x 1in
  • RS Stock No. 228-827
  • Mfr. Part No. TPL-BL
Each
HK$1,097.90
Better World
Siemens SENTRON 5SL4 MCB, 1+N, 500mA Curve D, 230V AC, 10 kA Breaking Capacity
  • RS Stock No. 209-6522
  • Mfr. Part No. 5SL4505-8
Each
HK$618.20
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 20A, Breaking Capacity 100 kA, Fixed Mount
  • RS Stock No. 269-674
  • Mfr. Part No. 3VA5282-7ED31-2AA0
Each
HK$9,291.40
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