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

101 of 999+
Bourns 2.6A Resettable Fuse, 6V
  • RS Stock No. 245-9156P
  • Mfr. Part No. MF-LSMF260/6X-2
Each (Supplied on a Reel)
HK$3.00
Schneider Electric Acti9 A9N MCB, 4P, 125A, 440V AC, 10000 A Breaking Capacity
  • RS Stock No. 276-8732
  • Mfr. Part No. A9N18377
Each
HK$7,439.14
Eaton 32A Cartridge Fuses, 14 x 51mm
  • RS Stock No. 261-445
  • Mfr. Part No. C14M32S
1 Pack of 10
HK$918.70
nVent ERICO Neutral Double Busbar Busbar
  • RS Stock No. 646-810
  • Mfr. Part No. 568717
Each
HK$45.55
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 100A, Breaking Capacity 25 kA, DIN Rail Mount
  • RS Stock No. 271-9648
  • Mfr. Part No. 3VA11103GD420AA0
Each
HK$4,971.20
Legrand HX Cover for use with Single Pole/Single Pole + Neutral Supply Bus Bar
  • RS Stock No. 823-4686
  • Mfr. Part No. 4 049 89
Each
HK$9.00
Siemens SENTRON 5SY7 MCB, 1P, 1.6A Curve D, 400V AC, 60V DC, 50 kA Breaking Capacity
  • RS Stock No. 610-524
  • Mfr. Part No. 5SY7115-8
Each
HK$453.65
RS PRO 1A T Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 178-4176
Each (In a Pack of 50)
HK$3.242
Littelfuse 20A Inline Fuse Holder for 6.3 x 32mm Fuse, 32V dc
  • RS Stock No. 360-7294
  • Mfr. Part No. 01550100Z
Each (In a Pack of 5)
HK$21.00
Better World
Siemens, Sentron MCCB Molded Case Circuit Breaker 3P 250A, Breaking Capacity 3 kA
  • RS Stock No. 245-668
  • Mfr. Part No. 3VA6225-6JT31-2AA0
Each
HK$22,330.30
ABB System Pro M Compact S200 M UC MCB, 1P, 32A Curve K, 230V AC, 220V DC, 10 kA Breaking Capacity
  • RS Stock No. 203-828
  • Mfr. Part No. 2CDS271061R0537
Each
HK$1,184.21
ABB SU200 M MCB, 3P, 25A Curve C, 400V AC, 15 kA Breaking Capacity
  • RS Stock No. 203-904
  • Mfr. Part No. 2CDS273337R0254
Each
HK$2,804.49
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
Mersen Surge Protector
  • RS Stock No. 179-3070
  • Mfr. Part No. 83230137 / STPT23-20K275V-4P-LFM
Each
HK$2,107.67
Better World
Siemens Sentron 5SY6 MCB, 1P, 4A Curve C, 230V AC, 72V DC, 6 kA Breaking Capacity
  • RS Stock No. 521-4951
  • Mfr. Part No. 5SY6104-7
Each
HK$199.10
Dehn Stainless Steel Lightning Earth Clamp Nominal Rod dia. 8-10mm
  • RS Stock No. 786-9358
  • Mfr. Part No. M8 UNI PV
Each
HK$151.40
SENTRON Terminal Cover for use with 3VA63/64 Series
  • RS Stock No. 263-815
  • Mfr. Part No. 3VA9343-0KB01
Each
HK$1,164.80
ABB Emax2 Electronic Circuit Breaker 5kA Ekip Dip LSI, 3 channels
  • RS Stock No. 259-3358
  • Mfr. Part No. 1SDA071273R1
Each
HK$375,283.55
Eaton RCBO, 10A Current Rating, 2P Poles, 30mA Trip Sensitivity, Type A, Type B, FRBmM Range
  • RS Stock No. 123-704
  • Mfr. Part No. 170886 FRBMM-B10/2/003-LIA
Each
HK$1,322.56
Mersen 2.5A FF Ceramic Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 188-6754
  • Mfr. Part No. P084308
Each (In a Pack of 10)
HK$39.669
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