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

47266 Products showing for Fuses & Circuit Breakers

13 of 999+
Limited stock
Bourns 0.065A Resettable Fuse, 220V
  • RS Stock No. 692-6778
  • Mfr. Part No. CMF-RL50-0
Each (In a Pack of 5)
HK$3.46
In Stock
Eaton 30A Rail Mount Fuse Holder, 1P, 600V ac
  • RS Stock No. 852-7398
  • Mfr. Part No. JT60030
Each
HK$533.40
In Stock
ABB System Pro M Compact S200M MCB, 3P, 32A Curve D, 400V AC, 125V DC, 10 kA Breaking Capacity
  • RS Stock No. 746-8185
  • Mfr. Part No. 2CDS273001R0321 S203M-D32
Each
HK$834.50
Temporarily out of stock
ABB S800PV MCB, 2P, 6A Curve B, 800V DC, 5 kA Breaking Capacity
  • RS Stock No. 225-5963
  • Mfr. Part No. 2CCF019643R0001 S802PV-SP6 - 5 kA
Each
HK$1,614.50
Temporarily out of stock
Better World
Schneider Electric Acti9 iID RCCB, 40A, 4 Pole, 30mA, 400V
  • RS Stock No. 218-3909
  • Mfr. Part No. A9Z51440
Each
HK$7,372.70
In Stock
WJ Furse Copper Earth Clamp Max. Conductor Size 25 x 3mm 25mm
  • RS Stock No. 153-2964
  • Mfr. Part No. 7TCA083610R0010 CT105-H
Each (In a Pack of 10)
HK$103.592
In Stock
Better World
Siemens Sentron 5SY4 MCB, 1P, 6A Curve D, 230V AC, 10 kA Breaking Capacity
  • RS Stock No. 772-1259
  • Mfr. Part No. 5SY4106-8
Each
HK$547.40
In Stock
Legrand 5A F Ceramic Cartridge Fuse, 5 x 20mm
  • RS Stock No. 266-3068
  • Mfr. Part No. 0 102 50
1 Box of 10
HK$144.90
In Stock
Better World
Schneider Electric Acti 9 iC60H MCB, 4P, 63A Curve C, 440V AC, 220 → 250V DC, 10 kA Breaking Capacity
  • RS Stock No. 791-3458
  • Mfr. Part No. A9F54463
Each
HK$1,886.70
Temporarily out of stock
Better World
Siemens, SENTRON Circuit breaker 4P 160A, DIN Rail Mount
  • RS Stock No. 224-7905
  • Mfr. Part No. 3VA1216-5GF42-0AA0
Each
HK$11,352.60
In Stock
Better World
Schneider Electric Acti9 iIDK RCCB, 25A, 2 Pole, 30mA, Type AC, 220 → 240V ac
  • RS Stock No. 238-3454
  • Mfr. Part No. A9R55225
Each
HK$898.10
In Stock
Eaton 200A Cartridge Fuse, 22 x 42mm
  • RS Stock No. 182-1445
  • Mfr. Part No. JJS-200
Each
HK$1,509.80
Temporarily out of stock
Siemens 6A NH Fuse, NH000, 500V ac
  • RS Stock No. 395-670
  • Mfr. Part No. 3NA6801
Each (In a Pack of 3)
HK$71.833
In Stock
Better World
Schneider Electric RCBO, 16A Current Rating, 1P Poles, 30mA Trip Sensitivity, Resi9 Range
  • RS Stock No. 247-2231
  • Mfr. Part No. R9D01616
Each
HK$406.40
In Stock
Eaton 40A Ceramic Cartridge Fuse, 14 x 51mm
  • RS Stock No. 181-8582
  • Mfr. Part No. C14M40
Each (In a Box of 10)
HK$18.33
In Stock
Mersen 25A Rail Mount Fuse Holder for 8 x 31mm Fuse, 3P+N, 400V ac
  • RS Stock No. 189-5330
  • Mfr. Part No. H1062676 / CMC83N
Each
HK$214.10
Currently unavailable
Schneider Electric IID RCCB, 40A, 4 Pole, 30mA, Type A, 380 → 415V ac
  • RS Stock No. 230-6688
  • Mfr. Part No. A9R51440
Each
HK$858.21
Temporarily out of stock
Better World
Siemens 3VA91 RCD, 160A, 3 Pole, Type A
  • RS Stock No. 218-1798
  • Mfr. Part No. 3VA9123-0RL30
Each
HK$13,546.40
Temporarily out of stock
xEffect RCCB, 63A, 4 Pole, 30mA, Type B, 456V ac
  • RS Stock No. 263-433
  • Mfr. Part No. 306421 FRCdM-63/4/003-G/Bfq-400
Each
HK$12,670.20
In Stock
ETA Thermal Magnetic Circuit Breaker - 2210 Single Pole DIN Rail Mount, 16A Current Rating
  • RS Stock No. 282-8771
  • Mfr. Part No. 2210-T210-K0M1-H121-16A
Each
HK$378.00
Results per page
1
13
2364