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

84 of 999+
Temporarily out of stock
Schneider Electric, ComPacT MCCB 3P 100A, Breaking Capacity 10 kA, Fixed Mount
  • RS Stock No. 345-320
  • Mfr. Part No. C11F34V100B
Each
HK$23,988.27
Temporarily out of stock
Eaton Fuse Holder Carrier
  • RS Stock No. 228-943
  • Mfr. Part No. CN01 FUSE CARRIER PORCELAIN D01 E16
1 Pack of 20
HK$441.80
Temporarily out of stock
Eaton Moeller NZM MCCB Molded Case Circuit Breaker 3P 400A, Breaking Capacity 6 kA, Fixed Mount
  • RS Stock No. 253-187
  • Mfr. Part No. 192358 NZMS3-PX400
Each
HK$31,564.60
Temporarily out of stock
Siemens Sentron Short circuit alarm switch for use with 3VA Series Circuit Breaker
  • RS Stock No. 874-4528
  • Mfr. Part No. 3VA9988-0AB32
Each
HK$294.30
In Stock
Better World
Schneider Electric Acti 9 A9N1 MCB, 2P, 100A Curve D
  • RS Stock No. 221-0889
  • Mfr. Part No. A9N18502
Each
HK$2,474.10
In Stock
Littelfuse 1.85A Resettable Fuse, 72V
  • RS Stock No. 517-6720
  • Mfr. Part No. RXEF185
Each (In a Pack of 10)
HK$3.33
Temporarily out of stock
Siemens 100A Fuse Holder for 22.2 x 58mm Fuse, 1P + N, 690V
  • RS Stock No. 299-650
  • Mfr. Part No. 3NW7252
Each
HK$815.30
In Stock
Eaton 15A Ceramic Cartridge Fuse, 10 x 38mm
  • RS Stock No. 703-8239
  • Mfr. Part No. PV-15A10F
Each
HK$281.70
Currently unavailable
Altech Thermal Circuit Breaker - V-EA 2 Pole 277V Voltage Rating DIN Rail Mount, 0.5A Current Rating
  • RS Stock No. 899-1733
  • Mfr. Part No. 2E05UM
Each
HK$295.90
In Stock
Eaton 40mA T Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 851-1432
  • Mfr. Part No. S506-40-R
Each (In a Pack of 5)
HK$45.70
In Stock
ABB High Performance S800N MCB, 2P, 80A Curve C, 400V AC, 36 kA Breaking Capacity
  • RS Stock No. 435-544
  • Mfr. Part No. 2CCG001229R0001
Each
HK$1,771.30
Temporarily out of stock
ABB SMISSLINE TP MCB, 1P, 1A, Type Z, 220V AC
  • RS Stock No. 246-2453
  • Mfr. Part No. 2CCS561001R1018
Each
HK$804.20
Temporarily out of stock
Better World
Schneider Electric, ComPact MCCB, Fixed Mount
  • RS Stock No. 221-0942
  • Mfr. Part No. LV429393
Each
HK$1,296.97
Temporarily out of stock
Eaton 40A Cartridge Fuse, 50 x 442mm
  • RS Stock No. 253-698
  • Mfr. Part No. 24TDMEJ40
Each
HK$1,977.80
Temporarily out of stock
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
In Stock
Mersen Surge Protector
  • RS Stock No. 179-3070
  • Mfr. Part No. 83230137 / STPT23-20K275V-4P-LFM
Each
HK$2,107.67
Temporarily out of stock
Littelfuse PC Board Non Resettable Fuse, Radial 50mA, 125V ac/dc
  • RS Stock No. 878-3233
  • Mfr. Part No. 0273.050H
Each
HK$56.10
In Stock
Better World
Schneider Electric Busbar Tap-Off Unit, Canalis Series
  • RS Stock No. 248-4068
  • Mfr. Part No. KBC16DCB21
Each
HK$251.60
Temporarily out of stock
160A Tag Fuse, 110 x 210mm, 690V
  • RS Stock No. 262-626
  • Mfr. Part No. EBH0013TBM8 SIZE 00 HOR FSD BTM
Each
HK$975.40
Temporarily out of stock
Siemens SENTRON 3VA9 Wire Connector for use with 3VA2 100/160/250
  • RS Stock No. 218-1797
  • Mfr. Part No. 3VA9123-0KP00
Each
HK$1,923.50
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