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

220 of 999+
In Stock
Schurter 20A Panel Mount Fuse Holder for 5 x 20mm Fuse, 250V ac
  • RS Stock No. 344-5636
  • Mfr. Part No. 0031.1753
Each (In a Pack of 5)
HK$33.00
In Stock
Littelfuse SMD Non Resettable Fuse 12A, 65V
  • RS Stock No. 738-2936
  • Mfr. Part No. 0451012.MRL
Each (In a Pack of 10)
HK$12.24
In Stock
Bulgin 16A Panel Mount Fuse Holder for 6.3 x 32mm Fuse, 1P, 250V ac
  • RS Stock No. 893-7064
  • Mfr. Part No. C0345RAAAA
Each (In a Pack of 5)
HK$32.62
Temporarily out of stock
Siemens SENTRON Undervoltage Release for use with 3VA4/5/6
  • RS Stock No. 157-831
  • Mfr. Part No. 3VA9978-0BB11
Each
HK$1,772.50
Temporarily out of stock
ABB Distribution Board
  • RS Stock No. 237-5942
  • Mfr. Part No. 184T1PB3MD
Each
HK$31,974.58
In Stock
Schneider Electric Tesys Circuit Breaker - TeSyS GB2 Single Pole 250V ac Voltage Rating Clip-On, 500mA Current Rating
  • RS Stock No. 589-844
  • Mfr. Part No. GB2CS05
1 Pack of 6
HK$2,713.80
Temporarily out of stock
Siemens 6A DIII Bottle Fuse, gG, 750V
  • RS Stock No. 665-083
  • Mfr. Part No. 5SD603
1 Pack of 5
HK$588.20
Temporarily out of stock
Schneider Electric, ComPacT MCCB 4P 160A, Breaking Capacity 10 kA, Fixed Mount
  • RS Stock No. 347-112
  • Mfr. Part No. C16N47E160
Each
HK$48,690.28
In Stock
Eaton 250A Rail Mount Fuse Holder for NH1, NH2 Fuse, 690V ac
  • RS Stock No. 182-1463
  • Mfr. Part No. SD12-PB
Each (In a Box of 5)
HK$241.30
Temporarily out of stock
Siemens SENTRON Cover for use with 20-30 x 5-10 mm, For Busbars
  • RS Stock No. 266-647
  • Mfr. Part No. 8US1922-1GA02
Each
HK$355.90
In Stock
WJ Furse Copper Alloy Earth Clamp Nominal Rod dia. 16mm
  • RS Stock No. 153-2963
  • Mfr. Part No. 7TCA083220R0010 CR515
Each (In a Pack of 10)
HK$68.65
In Stock
ETA Thermal Magnetic Circuit Breaker - 3400 Single Pole Panel Mount, 500mA Current Rating
  • RS Stock No. 122-9268
  • Mfr. Part No. 3400-P10-H-SI-0.5A
Each
HK$512.50
Temporarily out of stock
Hager HMD MCB, 3P, 100A, 400V AC, 15 Breaking Capacity
  • RS Stock No. 602-232
  • Mfr. Part No. HMD390
Each
HK$7,080.70
In Stock
ABB S800PV MCB, 2P, 50A Curve B, 800V DC, 5 kA Breaking Capacity
  • RS Stock No. 225-5924
  • Mfr. Part No. 2CCF019604R0001 S802PV-SP50 - 5 kA
Each
HK$1,971.40
Temporarily out of stock
Siemens SENTRON 5SY5 MCB, 2P, 4A Curve B, 400V AC, 440V DC, 15 kA Breaking Capacity
  • RS Stock No. 610-630
  • Mfr. Part No. 5SY5204-6
Each
HK$1,537.30
In Stock
Eaton 63A Rail Mount Fuse Holder for A1 Fuse, 1P, 1.2 kV ac, 750V dc
  • RS Stock No. 182-1775
  • Mfr. Part No. RSL63H
Each
HK$3,500.60
In Stock
Schurter 16A Panel Mount Fuse Holder for 5 x 20mm Fuse, 1P, 250V ac
  • RS Stock No. 173-9653
  • Mfr. Part No. 3101.0010
Each (In a Box of 100)
HK$19.529
In Stock
ETA Thermal Circuit Breaker - 1610 Single Pole 32V dc Voltage Rating, 6A Current Rating
  • RS Stock No. 409-867
  • Mfr. Part No. 1610-21-6A
Each
HK$68.00
Temporarily out of stock
Schurter Thermal Circuit Breaker - T13 Single Pole 240V ac Voltage Rating, 20A Current Rating
  • RS Stock No. 173-9849
  • Mfr. Part No. 4411.0108
Each (In a Box of 20)
HK$210.08
Temporarily out of stock
ABB S800S MCB, 1P, 20A Curve C, 240V AC, 50 kA Breaking Capacity
  • RS Stock No. 140-848
  • Mfr. Part No. 2CCS861001R0204
Each
HK$1,536.64
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