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

211 of 999+
Temporarily out of stock
Siemens SENTRON Wire Connector for use with 3VA5/6 400/600
  • RS Stock No. 269-7179
  • Mfr. Part No. 3VA9373-0JG13
Each (In a Pack of 3)
HK$623.067
Temporarily out of stock
Siemens SENTRON Connection Unit for use with 3VA15/25 1000
  • RS Stock No. 269-7237
  • Mfr. Part No. 3VA9604-0QB00
Each (In a Pack of 4)
HK$585.45
Temporarily out of stock
Siemens Sirius Connection Plug for use with Spring-Loaded Terminals
  • RS Stock No. 212-9042
  • Mfr. Part No. 3RA6860-5AC
Each
HK$594.80
Temporarily out of stock
Siemens SENTRON Draw-Out Unit for use with 3VA1 400/630 and 3VA2 400/630
  • RS Stock No. 210-9372
  • Mfr. Part No. 3VA9323-0KD00
Each
HK$11,985.40
In Stock
Siemens Connection Plug for use with S0 Size Circuit Breakers with Spring Terminal
  • RS Stock No. 124-3109
  • Mfr. Part No. 3RV2927-5AA00
Each
HK$100.20
Temporarily out of stock
Hager BFF RCCB, 40A, 4 Pole, 300mA, Type F
  • RS Stock No. 602-069
  • Mfr. Part No. BFF840
Each
HK$4,636.90
Temporarily out of stock
Siemens SENTRON Interlock Kit for use with 3VA15, 3VA25/26
  • RS Stock No. 152-784
  • Mfr. Part No. 3VA9587-0VF10
Each
HK$2,260.70
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 800A, Breaking Capacity 100 kA, Fixed Mount
  • RS Stock No. 250-170
  • Mfr. Part No. 3VA6580-7JQ32-0AA0
Each
HK$59,287.00
In Stock
Eaton xPole PXL, S200 MCB, 3P, 10A Curve C, 400V AC, 48V DC, 10 kA Breaking Capacity
  • RS Stock No. 490-080
  • Mfr. Part No. 236422 PXL-C10/3
Each
HK$837.30
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 25A, Breaking Capacity 85 kA, Fixed Mount
  • RS Stock No. 211-3784
  • Mfr. Part No. 3VA2125-6HN36-0AA0
Each
HK$7,851.30
Temporarily out of stock
Better World
Siemens, 3VA1 MCCB 4P 96A, Breaking Capacity 25 kA, Fixed Mount
  • RS Stock No. 210-3336
  • Mfr. Part No. 3VA1196-3EF46-0AA0
Each
HK$4,486.80
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 100A, Breaking Capacity 85 kA, Fixed Mount
  • RS Stock No. 216-4805
  • Mfr. Part No. 3VA2110-6HN36-0AA0
Each
HK$8,490.40
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 63A, Breaking Capacity 36 kA
  • RS Stock No. 210-1671
  • Mfr. Part No. 3VA1163-4EF42-0AA0
Each
HK$4,412.70
Temporarily out of stock
Siemens Sentron 5SP4 MCB, 3P, 80A Curve D, 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 196-3606
  • Mfr. Part No. 5SP4380-8
Each
HK$3,446.30
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 25A, Breaking Capacity 25 kA, Fixed Mount
  • RS Stock No. 211-3725
  • Mfr. Part No. 3VA1125-3EE42-0AA0
Each
HK$3,862.50
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 160A, Breaking Capacity 85 kA, Fixed Mount
  • RS Stock No. 210-1722
  • Mfr. Part No. 3VA2116-6HL42-0AA0
Each
HK$14,882.10
In Stock
Weidmuller 1 Phase Surge Protector, 16A, DIN Rail Mount
  • RS Stock No. 249-3334
  • Mfr. Part No. 1351650000
Each
HK$904.40
Temporarily out of stock
Hager NFN MCB, 4P, 50A Curve C, 240 → 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 144-4727
  • Mfr. Part No. NFN450
Each
HK$3,661.31
Temporarily out of stock
Contactum 10 Way Steel Consumer Unit, 100A Defender
  • RS Stock No. 184-9148
  • Mfr. Part No. DDS10188SPMS-P01
Each
HK$2,497.11
In Stock
Better World
Schneider Electric Acti 9 iC60H MCB, 1P, 10A Curve C, 230V AC, 72V DC, 10 kA Breaking Capacity
  • RS Stock No. 776-2269
  • Mfr. Part No. A9F07110
Each
HK$305.50
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