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

145 of 999+
Temporarily out of stock
Siemens, SENTRON MCCB 3P 175A, Breaking Capacity 7 kA, Fixed Mount
  • RS Stock No. 147-989
  • Mfr. Part No. 3VA5217-5EC31-0AA0
Each
HK$11,915.90
In Stock
Schurter 6.3A PCB Mount Fuse Holder for 5 x 20mm Fuse, 250V ac
  • RS Stock No. 866-4725
  • Mfr. Part No. 0031.3601
Each (In a Pack of 100)
HK$70.942
In Stock
ABB System Pro M Compact S200 MCB, 1P, 10A Curve C, 253V AC, 72V DC, 6 kA Breaking Capacity
  • RS Stock No. 488-6836
  • Mfr. Part No. 2CDS251001R0104 - S201C10
Each
HK$186.50
Temporarily out of stock
Siemens SENTRON Adapter for use with For TD400
  • RS Stock No. 265-574
  • Mfr. Part No. 3VW9011-0AT43
Each
HK$2,151.30
In Stock
Legrand DX3 RCCB, 63A, 1+N Pole, 30mA, Type AC
  • RS Stock No. 732-0109
  • Mfr. Part No. 4 116 33
Each
HK$2,033.53
Temporarily out of stock
Siemens 40A Cartridge Fuse, 14 X 51mm
  • RS Stock No. 665-077
  • Mfr. Part No. 3NW8117-1
1 Pack of 10
HK$658.00
Temporarily out of stock
ABB System Pro M Compact S200 M UC MCB, 2P, 5A, Type Z, 400V AC, 440V DC, 10 kA Breaking Capacity
  • RS Stock No. 201-016
  • Mfr. Part No. 2CDS272061R0358
Each
HK$3,003.35
Temporarily out of stock
Phoenix Contact CB Electronic Circuit breaker 8A 24V CB E1, On Base Element
  • RS Stock No. 855-7403
  • Mfr. Part No. 2800927
Each
HK$429.60
Temporarily out of stock
Schneider Electric Compact Long Rear Connection for use with NS630b
  • RS Stock No. 340-972
  • Mfr. Part No. 33606
Each
HK$4,055.11
Temporarily out of stock
Eaton 125A Fuse Holder for 22.2 x 58mm Fuse, 1P, 690V
  • RS Stock No. 229-017
  • Mfr. Part No. CH221DNU 1P+N 22x58 Fuse Holder
1 Pack of 3
HK$2,506.10
In Stock
Schneider Electric, ComPacT NSX Circuit breaker 1P 63A, Breaking Capacity 25 kA, Busbar System
  • RS Stock No. 654-191
  • Mfr. Part No. IL0631P251
Each
HK$1,612.07
Temporarily out of stock
SENTRON Plug In Unit for use with 3VA61/62 Series
  • RS Stock No. 263-963
  • Mfr. Part No. 3VA9143-0KP00
1 Kit
HK$2,362.90
In Stock
Phoenix Contact Thermal Circuit Breaker - TCP 0.25A Single Pole 65 V dc, 250V ac Voltage Rating, 250mA Current Rating
  • RS Stock No. 170-3784
  • Mfr. Part No. 0712123
Each (In a Box of 20)
HK$130.175
Temporarily out of stock
Schneider Electric, ComPacT NSX Circuit breaker 4P 100A, Breaking Capacity 40 KA
  • RS Stock No. 119-651
  • Mfr. Part No. C10B44B100
Each
HK$32,255.46
Temporarily out of stock
Siemens SIRIUS Undervoltage Release for use with Motor Circuit Breaker
  • RS Stock No. 157-852
  • Mfr. Part No. 3RV1912-1CV1
Each
HK$388.70
Temporarily out of stock
Better World
Siemens SENTRON 5SL6 MCB, 2P, 20A Curve C, 400V AC, 72V DC
  • RS Stock No. 213-1040
  • Mfr. Part No. 5SL6220-7
Each
HK$577.20
In Stock
TE Connectivity Thermal Circuit Breaker - W31 Single Pole 50 V dc, 240V ac Voltage Rating, 10A Current Rating
  • RS Stock No. 782-0930
  • Mfr. Part No. W31-X2M1G-10
Each
HK$329.00
Temporarily out of stock
Schurter 12A T Ceramic Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 173-7910
  • Mfr. Part No. 8020.0603.G
1 Box of 1000
HK$5,345.80
In Stock
4A Bottle Fuse, 400V
  • RS Stock No. 263-468
  • Mfr. Part No. 4NZ01R FUSE-D01 4A GR 400VAC E14
1 Pack of 10
HK$531.60
In Stock
Schneider Electric Acti9 A9F0 MCB, 3P, 13A Curve C, 440V AC, 180V DC, 10 kA Breaking Capacity
  • RS Stock No. 212-170
  • Mfr. Part No. A9F07313
Each
HK$1,374.89
1
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