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

2267 of 999+
Temporarily out of stock
Siemens 16A Cartridge Fuse, 10 x 85mm
  • RS Stock No. 627-171
  • Mfr. Part No. 3NW6605-4
1 Pack of 10
HK$1,741.30
Temporarily out of stock
Better World
Siemens SENTRON 5SL6 MCB, 3+N, 1.3A Curve C
  • RS Stock No. 216-5925
  • Mfr. Part No. 5SL6415-7
Each
HK$1,280.90
Temporarily out of stock
Hager BF RCCB, 63A, 2P Pole, 300mA, Type A
  • RS Stock No. 602-186
  • Mfr. Part No. BF263
Each
HK$5,139.70
Temporarily out of stock
Better World
Schneider Electric ComPact NSX Mounting Plate for use with Compact NSX 400/630 circuit breaker
  • RS Stock No. 219-9404
  • Mfr. Part No. LV432532
Each
HK$3,571.04
Temporarily out of stock
Eaton, Eaton Moeller Series NZM MCCB Molded Case Circuit Breaker 3P 2A, Breaking Capacity 50 kA, Fixed Mount
  • RS Stock No. 247-995
  • Mfr. Part No. 103026 NZMN1-S2-CNA
Each
HK$4,529.44
Temporarily out of stock
Better World
Siemens SENTRON Electronic Circuit Breaker 500A 3VA, 3 channels
  • RS Stock No. 156-749
  • Mfr. Part No. 3VA2440-0MQ32-0AA0
Each
HK$35,965.90
Temporarily out of stock
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 3P 250A, Breaking Capacity 5 kA, Fixed Mount
  • RS Stock No. 230-278
  • Mfr. Part No. 107845 NZMN2-VE250-BT-NA
Each
HK$20,089.51
Temporarily out of stock
Bourns 3.3A Resettable Fuse, 12V
  • RS Stock No. 245-9159
  • Mfr. Part No. MF-LSMF330/12X-2
Each (On a Reel of 3000)
HK$3.913
In Stock
Socomec 32A Rail Mount Fuse Holder for 10 x 38mm Fuse, 3P+N, 690V
  • RS Stock No. 233-3325
  • Mfr. Part No. 57010019
Each (In a Pack of 3)
HK$302.067
Temporarily out of stock
ABB System Pro M Compact S200 M UC MCB, 4P, 13A Curve C, 400V AC, 440V DC, 10 kA Breaking Capacity
  • RS Stock No. 201-088
  • Mfr. Part No. 2CDS274061R0134
Each
HK$4,850.93
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 600A, Breaking Capacity 35 kA, Fixed Mount
  • RS Stock No. 249-380
  • Mfr. Part No. 3VA6460-5HN31-0AA0
Each
HK$28,627.60
In Stock
Mersen 2A Slow-Blow Ceramic Cartridge Fuse, 13 x 29mm
  • RS Stock No. 209-6427
  • Mfr. Part No. V1036973 / BMD42V2
Each (In a Pack of 10)
HK$41.212
In Stock
ETA ESX10 Electronic Circuit breaker 6A 12V ESX10-T, 1 channels , Plug-In Mounting
  • RS Stock No. 210-2151
  • Mfr. Part No. ESX10-TC-124-DC12V-6A-E
Each
HK$767.80
Temporarily out of stock
ABB F200 RCCB, 40A, 4 Pole, 500mA, 400V ac
  • RS Stock No. 176-9623
  • Mfr. Part No. F204BS-40/0.5
Each
HK$14,854.24
In Stock
Eaton 750mA T Glass Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 852-7146
  • Mfr. Part No. MDL-3-4-R
Each
HK$22.60
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 40A, Breaking Capacity 7 kA
  • RS Stock No. 159-523
  • Mfr. Part No. 3VA1140-4EE36-0AA0
Each
HK$3,539.70
Temporarily out of stock
Schneider Electric ComPacT Cover Frame for use with ComPacT NS630b
  • RS Stock No. 655-146
  • Mfr. Part No. C100H3WM
Each
HK$31,015.90
Temporarily out of stock
Better World
Siemens SIRIUS Electronic Circuit Breaker 84A 3RV2, 3 channels , DIN Rail Mount
  • RS Stock No. 159-993
  • Mfr. Part No. 3RV2342-4RC10
Each
HK$4,889.70
Temporarily out of stock
ABB Connecting Terminals for use with DDA200, F200, S200
  • RS Stock No. 250-4724
  • Mfr. Part No. 2CDL200010R5015
Each
HK$64.27
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 100A, Breaking Capacity 55 kA, Fixed Mount
  • RS Stock No. 270-3542
  • Mfr. Part No. 3VA2010-5JQ36-0AA0
Each
HK$29,858.90
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