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

15 of 999+
In Stock
Contactum MCB, 1P, 16A Curve D, 250V AC, 10 kA Breaking Capacity
  • RS Stock No. 184-9033
  • Mfr. Part No. CPB1016D
Each
HK$44.90
In Stock
Eaton 32A Rail Mount Fuse Holder for 10 x 38mm Fuse, 1P, 1kV
  • RS Stock No. 182-1403
  • Mfr. Part No. CHPV1IU
Each (In a Box of 12)
HK$460.308
In Stock
Mersen 8A Ceramic Cartridge Fuse, 8 x 32mm
  • RS Stock No. 230-2976
  • Mfr. Part No. B213096
Each (In a Pack of 10)
HK$10.02
Temporarily out of stock
Better World
Siemens SENTRON 5SY4 MCB, 3+N, 8A Curve D, 400V AC, 72V DC, 5 kA Breaking Capacity
  • RS Stock No. 212-8846
  • Mfr. Part No. 5SY4608-8
Each
HK$1,567.60
In Stock
Littelfuse 5A F Glass Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 769-0089
  • Mfr. Part No. 0312005.HXP
Each (In a Pack of 10)
HK$2.60
Temporarily out of stock
Littelfuse 15A T Ceramic Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 738-2829
  • Mfr. Part No. 0326015.MXP
Each (In a Pack of 10)
HK$11.53
Temporarily out of stock
Eaton 20A Rail Mount Fuse Holder, 1P, 460 V dc, 660 → 690V ac
  • RS Stock No. 182-1406
  • Mfr. Part No. RS20F
Each (In a Box of 10)
HK$1,222.82
Temporarily out of stock
Better World
Siemens SENTRON 5SY5 MCB, 1P, 2A Curve B, 400V AC, 220V DC, 10 kA Breaking Capacity
  • RS Stock No. 210-3406
  • Mfr. Part No. 5SY5102-6
Each
HK$436.70
In Stock
Better World
Siemens SENTRON 5SY5 MCB, 1P, 2A Curve C, 10 kA Breaking Capacity
  • RS Stock No. 202-7109
  • Mfr. Part No. 5SY5102-7
Each
HK$685.50
In Stock
ETA Thermal Circuit Breaker - 3120-N 5 Pole 50 V DC, 240 V AC Voltage Rating, 5A Current Rating
  • RS Stock No. 210-2110
  • Mfr. Part No. 3120-N554-P7T1-W02D-5A
Each
HK$266.70
In Stock
Eaton 20A T Glass Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 852-7137
  • Mfr. Part No. MDL-20-R
Each
HK$20.20
Stock information currently inaccessible
Eaton 315A Centred Tag Fuse, NH00, 690V
  • RS Stock No. 182-1833
  • Mfr. Part No. 170M1572D
Each
HK$2,359.30
In Stock
Schneider Electric Acti9 A9F MCB Mini Circuit Breaker, 2P, 16A Curve C, 500V AC, 10 kA Breaking Capacity
  • RS Stock No. 653-861
  • Mfr. Part No. A9F74216
Each
HK$910.80
In Stock
Littelfuse SMD Non Resettable Fuse 4A, 125V ac/dc
  • RS Stock No. 541-3669
  • Mfr. Part No. 0452004.MRL
Each (In a Pack of 10)
HK$7.26
In Stock
RS PRO 200mA T Glass Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 611-0204
Each (In a Pack of 10)
HK$12.79
In Stock
Better World
Schneider Electric Acti9 iIG40K RCCB, 25A, 3+N Pole, 300mA, Type AC, 380 → 415V ac
  • RS Stock No. 238-3477
  • Mfr. Part No. A9R79725
Each
HK$2,903.80
In Stock
Eaton 10A T Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 169-9389
  • Mfr. Part No. S506-10-R
1 Bag of 1000
HK$3,528.50
Unavailable
Eaton Bussmann Series 4A F Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 385-7893
  • Mfr. Part No. GMA-4A-BK
Each (In a Pack of 10)
HK$2.71
Temporarily out of stock
Legrand 250A Cartridge Fuse, 65 x 134.5mm
  • RS Stock No. 266-3193
  • Mfr. Part No. 0 174 65
1 Box of 3
HK$2,219.54
In Stock
Better World
Siemens RCBO, 16A Current Rating, 1P+N Poles, 30mA Trip Sensitivity, Type A, SENTRON Range
  • RS Stock No. 187-3283
  • Mfr. Part No. 5SV1316-6KK16
Each
HK$1,013.90
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