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

141 of 999+
Siemens, SENTRON MCCB 2P 125A, Breaking Capacity 7 kA, Fixed Mount
  • RS Stock No. 147-262
  • Mfr. Part No. 3VA5212-5EC61-0AA0
Each
HK$5,412.50
Better World
Siemens, SENTRON MCCB 1P 40A, Breaking Capacity 55 kA, Fixed Mount
  • RS Stock No. 271-9328
  • Mfr. Part No. 3VA1140-5ED12-0AA0
Each
HK$1,019.40
Better World
ABB Emax2 Electronic Circuit Breaker 630A 1SDA07, 3 channels
  • RS Stock No. 259-9891
  • Mfr. Part No. 1SDA070724R1
Each
HK$43,391.77
Hager 16A Cartridge Fuse, 10 x 38mm
  • RS Stock No. 250-8606
  • Mfr. Part No. LF316G
Each (In a Pack of 10)
HK$41.599
Acti9 Busbar, 415V ac, 18mm Pitch
  • RS Stock No. 585-483
  • Mfr. Part No. A9XPH316
1 Pack of 5
HK$3,167.10
Eaton 32A Rail Mount Fuse Holder for 10 x 38mm Fuse, 1P, 690V ac
  • RS Stock No. 765-2932
  • Mfr. Part No. CHM1DIU
Each
HK$449.20
Schneider Electric RCBO, 32A Current Rating, 1P+N Poles, 30mA Trip Sensitivity, Type C, Acti9 Range
  • RS Stock No. 654-734
  • Mfr. Part No. A9DC4632
Each
HK$4,133.00
Better World
Schneider Electric RCBO, 32A Current Rating, 1P+N Poles, 30mA Trip Sensitivity, Type C, Acti9 Range
  • RS Stock No. 238-3356
  • Mfr. Part No. A9DX2632
Each
HK$3,958.38
Phoenix Contact 2A T Cartridge Fuse, 5 x 20mm
  • RS Stock No. 512-401
  • Mfr. Part No. 1457326
1 Pack of 10
HK$78.50
ABB F200 RCCB, 40A, 4 Pole, 30mA, Type A, 400V ac
  • RS Stock No. 231-9901
  • Mfr. Part No. 2CSF204101R1400 F204 A-40/0,03
Each
HK$1,587.10
Better World
Siemens RCBO, 13A Current Rating, 2P Poles, 30mA Trip Sensitivity, Sentron Range
  • RS Stock No. 150-4177
  • Mfr. Part No. 5SU1354-6KK13
Each
HK$1,283.80
Better World
Siemens RCBO, 32A Current Rating, 2P Poles, 30mA Trip Sensitivity, Sentron Range
  • RS Stock No. 151-1211
  • Mfr. Part No. 5SU1356-6KK32
Each
HK$1,170.30
Littelfuse SMD Non Resettable Fuse 1A, 125V ac/dc
  • RS Stock No. 541-3625
  • Mfr. Part No. 0452001.MRL
Each (In a Pack of 10)
HK$11.87
Better World
Siemens RCBO, 16A Current Rating, 2P Poles, 10mA Trip Sensitivity, SENTRON Range
  • RS Stock No. 211-9598
  • Mfr. Part No. 5SU1154-7KK16
Each
HK$1,350.10
Better World
Siemens RCBO, 4A Current Rating, 1P+N Poles, 30mA Trip Sensitivity, Type C, SENTRON Range
  • RS Stock No. 187-3285
  • Mfr. Part No. 5SV1316-7KK04
Each
HK$978.10
Better World
Siemens RCBO, 32A Current Rating, 2P Poles, 30mA Trip Sensitivity, Type B, Sentron Range
  • RS Stock No. 243-6157
  • Mfr. Part No. 5SU1324-6KX32
Each
HK$1,475.30
Siemens SENTRON Busbar
  • RS Stock No. 266-505
  • Mfr. Part No. 8US1313-4AM04
Each
HK$2,841.10
Wickmann PC Board Non Resettable Fuse, Radial 2.5A, 250V ac
  • RS Stock No. 377-2174P
  • Mfr. Part No. 3821250041
Each (Supplied in a Bag)
HK$9.61
SIBA 325A White Automotive Car Fuse, 80V dc
  • RS Stock No. 161-1837
  • Mfr. Part No. 9005805.325
Each
HK$46.70
Schneider Electric RCBO, 32A Current Rating, 2P Poles, 30mA Trip Sensitivity, Type C, Acti9 Range
  • RS Stock No. 654-836
  • Mfr. Part No. A9D19232
Each
HK$4,343.80
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