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

2298 of 999+
Temporarily out of stock
Siemens SENTRON Cover for use with Busbar
  • RS Stock No. 211-3858
  • Mfr. Part No. 8US1922-2BA00
Each (In a Pack of 10)
HK$200.38
Temporarily out of stock
Eaton MCB, 2P, 13A Curve C, 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 241-167
  • Mfr. Part No. 101299 PLI-C13/2
Each
HK$797.07
Temporarily out of stock
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 3P 250A, Breaking Capacity 5 kA, Fixed Mount
  • RS Stock No. 232-003
  • Mfr. Part No. 107842 NZMH2-VEF250-BT-NA
Each
HK$25,242.10
Temporarily out of stock
Schneider Electric ComPacT Thermal Magnetic Release for use with Distribution
  • RS Stock No. 119-293
  • Mfr. Part No. C106TM032
Each
HK$3,069.09
Temporarily out of stock
Eaton xEffect FAZ MCB, 3P, 13A Curve B, 415V AC, 60V DC, 15 kA Breaking Capacity
  • RS Stock No. 247-882
  • Mfr. Part No. 132722 FAZ-B13/3-NA
Each
HK$1,497.41
Temporarily out of stock
Siemens 80A Tag Fuse, 123.9mm, 900V
  • RS Stock No. 608-358
  • Mfr. Part No. 3NB1022-1KK10
1 Pack of 3
HK$2,622.90
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 45A, Breaking Capacity 35 kA, Fixed Mount
  • RS Stock No. 268-038
  • Mfr. Part No. 3VA5245-5ED31-2AA0
Each
HK$7,324.30
In Stock
Legrand 20A Ceramic Cartridge Fuse, 10 x 38mm
  • RS Stock No. 180-6120
  • Mfr. Part No. 0 133 20
Each (In a Box of 10)
HK$20.33
In Stock
Better World
ABB System Pro M Compact S200 MCB, 4P, 16A Curve C, 400V AC, 110V DC, 6 kA Breaking Capacity
  • RS Stock No. 746-7801
  • Mfr. Part No. 2CDS254001R0164 S204-C16
Each
HK$1,456.90
In Stock
Siemens 90 → 110V ac Shunt Trip Circuit Trip for use with 3RV2 Series Circuit Breakers
  • RS Stock No. 706-1942
  • Mfr. Part No. 3RV2902-1DF0
Each
HK$710.90
Temporarily out of stock
ABB System Pro M Compact SU200M MCB, 3P, 40A, Type Z
  • RS Stock No. 231-9764
  • Mfr. Part No. 2CDS273337R0558 SU203M-Z40
1 Box of 1
HK$2,131.02
Temporarily out of stock
ABB Emax2 Electronic Circuit Breaker 6.3kA 1SDA07, 4 / f channels
  • RS Stock No. 259-3968
  • Mfr. Part No. 1SDA072020R1
Each
HK$538,499.94
Temporarily out of stock
Schneider Electric, ComPacT new generation Circuit breaker 2P 160A, Breaking Capacity 18 kA, DIN Rail Mount
  • RS Stock No. 358-007
  • Mfr. Part No. C16F2TM160
Each
HK$10,407.11
Temporarily out of stock
Better World
Siemens SENTRON 3VA1 MCB, 2P, 25A
  • RS Stock No. 224-7832
  • Mfr. Part No. 3VA1125-4ED26-0AA0
Each
HK$2,852.40
Temporarily out of stock
Phoenix Contact 1 Phase Surge Protector, 10kA, DIN Rail Mount
  • RS Stock No. 252-5374
  • Mfr. Part No. 1077106
Each
HK$1,191.80
Temporarily out of stock
Better World
Siemens SENTRON Electronic Circuit Breaker 63A 3VA2, 3 channels
  • RS Stock No. 157-281
  • Mfr. Part No. 3VA2163-5JP32-0AA0
Each
HK$11,389.20
In Stock
Schneider Electric RCBO, 16A Current Rating, 2P Poles, 300mA Trip Sensitivity, Type C, Acti9 Range
  • RS Stock No. 130-736
  • Mfr. Part No. A9D50216
Each
HK$7,464.17
Temporarily out of stock
Better World
Siemens Sentron 5SY4 MCB, 4P, 25A Curve D, 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 124-3200
  • Mfr. Part No. 5SY4425-8
Each
HK$1,572.40
Temporarily out of stock
Schneider Electric, ComPacT MCCB 4P 400A, Fixed Mount
  • RS Stock No. 260-8172
  • Mfr. Part No. C40W42D400
Each
HK$49,957.53
Temporarily out of stock
Schneider Electric, ComPacT MCCB 3P 100A, Fixed Mount
  • RS Stock No. 260-7909
  • Mfr. Part No. C25H34V100
Each
HK$28,752.49
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