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

2346 of 999+
Temporarily out of stock
Better World
Siemens SENTRON 5SY7 MCB, 1+N, 1.6A Curve C
  • RS Stock No. 216-5942
  • Mfr. Part No. 5SY7515-7
Each
HK$709.20
In Stock
Better World
Schneider Electric Acti9 iIDK RCCB, 25A, 4 Pole, 300mA, Type AC, 380 → 415V ac
  • RS Stock No. 238-3461
  • Mfr. Part No. A9R56425
Each
HK$1,732.32
In Stock
Better World
Siemens SENTRON 5SL4 MCB, 3P, 8A Curve B, 400V AC, 72V DC
  • RS Stock No. 210-3365
  • Mfr. Part No. 5SL4308-6
Each
HK$730.40
In Stock
ETA Thermal Circuit Breaker - 2-5700 Single Pole 250V Voltage Rating Panel Mount, 2.5A Current Rating
  • RS Stock No. 405-9129
  • Mfr. Part No. 2-5700-IG1-P10-DD-000040-2.5A
Each
HK$205.50
In Stock
Siemens Bottle Fuse Adapter Ring Adapter Sleeve
  • RS Stock No. 232-2070
  • Mfr. Part No. 5SH5032
Each (In a Pack of 50)
HK$5.606
Temporarily out of stock
Better World
Schneider Electric, ComPacT NSX MCCB 3P 250A, Fixed Mount
  • RS Stock No. 254-6363
  • Mfr. Part No. C25V32D250
Each
HK$25,426.60
In Stock
Siemens 80A Slotted Tag Fuse, NH000, 690V
  • RS Stock No. 230-3018
  • Mfr. Part No. 3NE8720-1
Each (In a Pack of 10)
HK$618.98
Temporarily out of stock
Siemens 300A Centred Tag Fuse, NH2, 690V
  • RS Stock No. 210-6894
  • Mfr. Part No. 3NA3250-6
Each (In a Pack of 3)
HK$737.667
Temporarily out of stock
Siemens SENTRON Nut Keeper Kit for use with 3VA51
  • RS Stock No. 269-7090
  • Mfr. Part No. 3VA9133-0QA00
Each (In a Pack of 3)
HK$90.267
In Stock
Schurter 10A T Ceramic Cartridge Fuse, 5 x 20mm
  • RS Stock No. 789-7788
  • Mfr. Part No. 0001.2514
Each (In a Bag of 10)
HK$3.98
Temporarily out of stock
Better World
Schneider Electric, ComPacT NSX MCCB 3P 160A, Fixed Mount
  • RS Stock No. 254-6330
  • Mfr. Part No. C12F3TM160L
Each
HK$8,911.24
In Stock
Schurter TA36 Rocker Circuit Breaker - TA36 2 Pole 60 V dc, 277 V ac Voltage Rating, 16A Current Rating
  • RS Stock No. 221-5617
  • Mfr. Part No. 3-128-230
1 Box of 10
HK$1,503.10
In Stock
RS PRO 100A Bolted Tag Fuse, 120 V dc, 240V ac, 41.8mm
  • RS Stock No. 221-3636
Each
HK$110.50
Temporarily out of stock
Eaton MCB, 1P, 2A Curve B, 230V AC, 10 kA Breaking Capacity
  • RS Stock No. 248-582
  • Mfr. Part No. 101266 PLI-B2/1N
Each
HK$514.33
In Stock
Better World
Schneider Electric Multi 9 MCB Mini Circuit Breaker, 2P, 40A Curve D, 277V AC
  • RS Stock No. 256-6772
  • Mfr. Part No. M9F23240
Each
HK$1,625.50
In Stock
Better World
Schneider Electric ComPact NSX, Easy Pact CVS Terminal Extention for use with ComPact NSX, Easy Pact CVS circuit
  • RS Stock No. 219-9351
  • Mfr. Part No. LV429263
Each
HK$424.60
In Stock
Eaton RCBO, 10A Current Rating, 1P+N Poles, 30mA Trip Sensitivity, Type B, PXK Range
  • RS Stock No. 183-3538
  • Mfr. Part No. 236946 PXK-B10/1N/003-A
Each
HK$682.70
In Stock
Better World
Schneider Electric Acti 9 Acti9 iDT40T MCB, 1+N, 16A Curve C, 230V AC, 6 kA Breaking Capacity
  • RS Stock No. 191-6089
  • Mfr. Part No. A9P22616
Each
HK$252.80
Temporarily out of stock
Schneider Electric, PowerPact Circuit breaker 3P 250A, Breaking Capacity 25 kA, DIN Rail Mount
  • RS Stock No. 357-932
  • Mfr. Part No. NLDL36250U31X
Each
HK$65,368.76
Temporarily out of stock
Eaton RCBO, 40A Current Rating, 2P Poles, 300mA Trip Sensitivity, Type A, Type C, FRBm6 Range
  • RS Stock No. 123-272
  • Mfr. Part No. 170732 FRBM6-C40/2/03-A
Each
HK$1,550.91
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