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

36 of 999+
Siemens Fuse Holder Adapter Sleeve
  • RS Stock No. 202-7160
  • Mfr. Part No. 5SH5404
Each (In a Pack of 10)
HK$14.27
Siemens SENTRON 5SP3740 MCB, 1P, 40A, Type E
  • RS Stock No. 231-8349
  • Mfr. Part No. 5SP3740-3
Each
HK$958.20
Littelfuse 1A T Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 541-2931
  • Mfr. Part No. 0213001.MXP
Each (In a Pack of 10)
HK$6.76
Better World
Siemens, SENTRON MCCB 4P 40A, Breaking Capacity 150 kA, Fixed Mount
  • RS Stock No. 270-3805
  • Mfr. Part No. 3VA2040-8HN46-0AA0
Each
HK$12,620.10
RS PRO 12.5A F Ceramic Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 209-9282
Each (In a Pack of 10)
HK$8.15
ABB S201L MCB, 1P, 20A Curve C, 230/400V AC, 6 kA Breaking Capacity
  • RS Stock No. 201-343
  • Mfr. Part No. 2CDS241701R0204
Each
HK$346.43
Better World
Siemens RCBO, 13A Current Rating, 1P+N Poles, 30mA Trip Sensitivity, Type A, SENTRON Range
  • RS Stock No. 187-3282
  • Mfr. Part No. 5SV1316-6KK13
Each
HK$550.60
Phoenix Contact Thermal Magnetic Circuit Breaker - TMC 2 Pole 250V ac Voltage Rating DIN Rail, 2A Current Rating
  • RS Stock No. 135-902
  • Mfr. Part No. 0914992
1 Pack of 3
HK$3,990.70
Eaton 2A F Glass Cartridge Fuse, 6.3 x 25mm
  • RS Stock No. 849-5529
  • Mfr. Part No. AGX-2
Each
HK$22.70
ABB 16 Way Steel Consumer Unit, 100A, IP30 Housemaster
  • RS Stock No. 453-996
  • Mfr. Part No. 1SKB118142C6001
Each
HK$2,425.80
RS PRO Rail Mount Fuse Holder
  • RS Stock No. 501-871
Each
HK$130.60
Better World
Schneider Electric
  • RS Stock No. 125-1383
  • Mfr. Part No. A9C70122
Each
HK$2,541.30
RS PRO 7A T Glass Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 177-8105
Each (In a Pack of 20)
HK$4.135
RS PRO Earthing Strap
  • RS Stock No. 746-7384
Each
HK$26.60
Wickmann Panel Mount Fuse Holder
  • RS Stock No. 174-0754
  • Mfr. Part No. 03453LF8H
Each (In a Pack of 5)
HK$35.14
Eaton 32A British Standard Fuse, A2, 660V ac, 73mm
  • RS Stock No. 415-187
  • Mfr. Part No. TIA32M35
Each (In a Pack of 5)
HK$119.66
Schneider Electric, PowerPact MCCB 3P 400A, Breaking Capacity 25 kA, Flush Mount
  • RS Stock No. 354-527
  • Mfr. Part No. NLLF36000S40XTW
Each
HK$14,401.60
Eaton 20A Rail Mount Fuse Holder, 1P, 460 V dc, 660 → 690V ac
  • RS Stock No. 182-1406
  • Mfr. Part No. RS20F
Each (In a Box of 10)
HK$1,222.82
Better World
Schneider Electric Acti 9 Cable for use with Acti 9, Acti 9 Smartlink Circuit Breaker
  • RS Stock No. 125-1391
  • Mfr. Part No. A9XCAL06
Each
HK$591.89
ETA Thermal Circuit Breaker - 1658 Single Pole 250V Voltage Rating Panel Mount, 15A Current Rating
  • RS Stock No. 273-0882
  • Mfr. Part No. 1658-G21-02-P10-15A
Each
HK$42.80
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