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

2347 of 999+
Temporarily out of stock
Eaton RCBO, 40A Current Rating, 2P Poles, 300mA Trip Sensitivity, Type A, Type C, FRBm6 Range
  • RS Stock No. 123-272
  • Mfr. Part No. 170732 FRBM6-C40/2/03-A
Each
HK$1,550.91
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 20A, Breaking Capacity 5 kA, Cable Mount, Panel Mount
  • RS Stock No. 148-213
  • Mfr. Part No. 3VA5120-4ED41-0AA0
Each
HK$4,693.80
Temporarily out of stock
Siemens ALPHA Distribution Board
  • RS Stock No. 272-0322
  • Mfr. Part No. 8GK1081-4KK20
Each
HK$7,826.80
Temporarily out of stock
ABB Emax2 Electronic Circuit Breaker 1.25kA 1SDA07, 4 channels
  • RS Stock No. 259-4679
  • Mfr. Part No. 1SDA072956R1
Each
HK$82,997.04
Currently unavailable
Schneider Electric EasyPact Electronic Circuit Breaker 50A, Fixed
  • RS Stock No. 122-529
  • Mfr. Part No. LV510694
Each
HK$2,494.89
In Stock
ABB RCBO, 16A Current Rating, 2P Poles, 30mA Trip Sensitivity, System Pro M Compact Range
  • RS Stock No. 201-6949
  • Mfr. Part No. 2CSR275080R1164 DS201 M C16 AC30
Each
HK$1,449.00
Temporarily out of stock
Siemens, SENTRON MCCB 3P 600A, Breaking Capacity 35 kA, Fixed Mount
  • RS Stock No. 249-764
  • Mfr. Part No. 3VA6560-5JQ32-0AA0
Each
HK$45,536.20
Temporarily out of stock
Eaton xEffect - FRCmM RCCB, 63A, 2 Pole, 100mA, Type A, 240/415V ac
  • RS Stock No. 123-214
  • Mfr. Part No. 170275 FRCMM-63/2/01-A
Each
HK$2,749.78
Temporarily out of stock
Siemens SENTRON Connection Unit
  • RS Stock No. 277-0818
  • Mfr. Part No. 3WA9111-0AV12
Each
HK$469.20
Temporarily out of stock
Better World
ABB Emax2 Electronic Circuit Breaker 2kA Ekip G Hi-Touch LSIG, 3 channels
  • RS Stock No. 259-3232
  • Mfr. Part No. 1SDA071110R1
Each
HK$154,067.12
Temporarily out of stock
Better World
ABB, Tmax XT MCCB 4P 16A, Fixed Mount
  • RS Stock No. 236-6683
  • Mfr. Part No. 1SDA068313R1 XT4S 160 TMD 16A FF
Each
HK$6,576.40
In Stock
Eaton 250mA F Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 537-1262
  • Mfr. Part No. S500-250-R
Each (In a Pack of 10)
HK$23.98
Temporarily out of stock
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 100A, Breaking Capacity 200 kA, Fixed Mount
  • RS Stock No. 269-872
  • Mfr. Part No. 3VA6110-0KT41-0AA0
Each
HK$26,786.00
Temporarily out of stock
Schneider Electric, ComPacT MCCB 4P 40A, Fixed Mount
  • RS Stock No. 260-9510
  • Mfr. Part No. C10N4TM040
Each
HK$7,504.98
In Stock
Eaton 100mA F Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 537-1290
  • Mfr. Part No. S500-100-R
Each (In a Pack of 10)
HK$48.81
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 800A, Breaking Capacity 100 kA, Fixed Mount
  • RS Stock No. 250-166
  • Mfr. Part No. 3VA6580-7HN36-0AA0
Each
HK$51,395.70
In Stock
ETI 16A D01 Neozed Fuse, E14 Thread Size, gG, 400V ac
  • RS Stock No. 415-979
  • Mfr. Part No. 2211005
Each (In a Pack of 5)
HK$9.30
Temporarily out of stock
Siemens SENTRON Busbar
  • RS Stock No. 187-5182
  • Mfr. Part No. 5ST3657
Each
HK$8,601.90
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 400A, Breaking Capacity 70 kA, Fixed Mount
  • RS Stock No. 270-3496
  • Mfr. Part No. 3VA1340-6FF42-0AA0
Each
HK$18,931.30
Being discontinued
RS PRO 4A F Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 563-481
Each (In a Pack of 10)
HK$2.905
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