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

2274 of 999+
In Stock
Contactum MCB, 3P, 20A Curve B, 415V AC, 10 kA Breaking Capacity
  • RS Stock No. 184-9035
  • Mfr. Part No. CPB1020B3
Each
HK$133.00
In Stock
ABB RCBO, 32A Current Rating, 2P Poles, 30mA Trip Sensitivity, System Pro M Compact Range
  • RS Stock No. 201-6947
  • Mfr. Part No. 2CSR255080R1325 DS201 B32 AC30
Each
HK$1,443.00
In Stock
SIBA 16A Ceramic Cartridge Fuse, 10 x 38mm
  • RS Stock No. 314-4816
  • Mfr. Part No. 50-179-06/16A
Each (In a Pack of 5)
HK$61.90
In Stock
Eaton xEffect FAZ MCB, 1P, 32A Curve B, 230V AC, 60V DC, 10 kA Breaking Capacity
  • RS Stock No. 247-760
  • Mfr. Part No. 141907 FAZT-B32/1
Each
HK$411.09
Temporarily out of stock
Better World
Siemens SENTRON 5SL6 MCB, 3P, 1.6A Curve C, 400V AC, 72V DC
  • RS Stock No. 212-8873
  • Mfr. Part No. 5SL6315-7
Each
HK$777.70
In Stock
ABB RCBO, 40A Current Rating, 2P Poles, 30mA Trip Sensitivity, System Pro M Compact Range
  • RS Stock No. 201-6972
  • Mfr. Part No. 2CSR275080R1404
Each
HK$1,478.00
Temporarily out of stock
ALPHA 630 DIN, Abdeckung Höhe=150mm, Bre
  • RS Stock No. 229-9875
  • Mfr. Part No. 8GK9601-1KK10
Each (In a Pack of 10)
HK$300.21
Temporarily out of stock
Schneider Electric Flexible Busbar Trunking, 0.5 → 1.9m, 400A, Canalis Series
  • RS Stock No. 119-366
  • Mfr. Part No. KSA400ET43A
Each
HK$24,279.58
In Stock
Eaton 20A Centred Tag Fuse, NH000, 690V ac
  • RS Stock No. 182-1436
  • Mfr. Part No. 170M1560D
Each (In a Box of 10)
HK$1,499.11
In Stock
Eaton Moeller Door Coupling Handle for use with PKZM0, PKZM4
  • RS Stock No. 273-6417
  • Mfr. Part No. 106136 PKZ0-XH-MCC
Each
HK$675.26
In Stock
Wickmann PC Board Non Resettable Fuse, Radial 630mA, 250V ac
  • RS Stock No. 296-3284
  • Mfr. Part No. 3720630000
Each (In a Pack of 10)
HK$5.29
Temporarily out of stock
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 100A, Breaking Capacity 100 kA, Fixed Mount
  • RS Stock No. 268-438
  • Mfr. Part No. 3VA6110-7KQ41-2AA0
Each
HK$25,363.00
In Stock
Eaton xEffect MCB, 1P, 3A Curve C, 230 → 400V AC, 6 kA Breaking Capacity
  • RS Stock No. 769-4630
  • Mfr. Part No. 239032 FAZ6-C3/1
Each
HK$269.30
In Stock
Wickmann SMD Non Resettable Fuse 5A, 125V
  • RS Stock No. 174-0681
  • Mfr. Part No. 0453005.MR
Each (In a Pack of 5)
HK$9.18
In Stock
Eaton xEffect MCB, 2A Curve C, 230 → 400V AC, 6 kA Breaking Capacity
  • RS Stock No. 769-4589
  • Mfr. Part No. 239056 FAZ6-C2/1N
Each
HK$690.50
Temporarily out of stock
SIBA 500mA T Glass Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 418-9501
  • Mfr. Part No. 70-059-61/0.5A
Each (In a Pack of 10)
HK$1.94
Temporarily out of stock
Better World
Schneider Electric Flexible Busbar Trunking, 0.5m, 40A, Canalis KBB Series
  • RS Stock No. 211-0382
  • Mfr. Part No. KBB40DF4405W
Each
HK$1,922.90
In Stock
Eaton 20A Ceramic Cartridge Fuse, 14 x 51mm
  • RS Stock No. 181-8888
  • Mfr. Part No. C14M20
Each
HK$18.40
In Stock
Better World
Siemens SENTRON 5SV6016 Fire Safety Circuit Breaker, 2P, 20A Curve C, 230V AC, 6 kA Breaking Capacity
  • RS Stock No. 187-5251
  • Mfr. Part No. 5SV6016-7KK20
Each
HK$1,831.90
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 160A, Breaking Capacity 36 kA, Fixed Mount
  • RS Stock No. 271-9772
  • Mfr. Part No. 3VA1116-4FE42-0AA0
Each
HK$9,630.80
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