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

209 of 999+
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 100A, Breaking Capacity 55 kA, Fixed Mount
  • RS Stock No. 271-9670
  • Mfr. Part No. 3VA11105FD420AA0
Each
HK$5,698.60
Temporarily out of stock
Siemens SENTRON 5SP3316 MCB, 3P, 16A, Type E
  • RS Stock No. 231-8312
  • Mfr. Part No. 5SP3316-3
Each
HK$3,204.40
In Stock
Lovato 1 Phase Busbar, 18mm Pitch
  • RS Stock No. 825-6122
  • Mfr. Part No. P1X9031
Each
HK$246.50
Temporarily out of stock
Better World
Siemens SENTRON Terminal for use with 3VA1 250
  • RS Stock No. 269-7165
  • Mfr. Part No. 3VA9254-0JA12
Each (In a Pack of 4)
HK$92.30
In Stock
Better World
Siemens SENTRON 3VA9 Cover for use with 3VA1 100/160
  • RS Stock No. 218-1780
  • Mfr. Part No. 3VA9111-0WF30
Each
HK$248.30
In Stock
Siemens Sentron Adapter for use with Busbar
  • RS Stock No. 228-8245
  • Mfr. Part No. 8US1261-5FM08
Each
HK$387.70
In Stock
Better World
Siemens SENTRON Cover for use with 3VA1 400/630 and 3VA2 400/630
  • RS Stock No. 210-9403
  • Mfr. Part No. 3VA9481-0WF40
Each
HK$560.00
Temporarily out of stock
Siemens SENTRON 3VA9 Rotary Operator for use with 3VA1 400/630, 3VA2 400/630
  • RS Stock No. 218-1857
  • Mfr. Part No. 3VA9467-0EK23
Each
HK$2,213.20
In Stock
Siemens Sirius Innovation Support F Stand-Alone Installation for use with 3RB30, 3RB31 SZ.S2, 3RU21
  • RS Stock No. 875-1103
  • Mfr. Part No. 3RU2936-3AA01
Each
HK$333.40
In Stock
Siemens SIRIUS Kit for use with 3RW Soft Starter
  • RS Stock No. 213-0993
  • Mfr. Part No. 3RA6950-0A
Each
HK$335.90
Temporarily out of stock
Better World
Siemens SENTRON Electronic Circuit Breaker 400A 3VA, 3 channels
  • RS Stock No. 156-711
  • Mfr. Part No. 3VA2340-6HM32-0AA0
Each
HK$19,299.30
Temporarily out of stock
Schneider Electric, ComPacT NSX Circuit breaker 2P 25A, Breaking Capacity 85 KA, Fixed Mount
  • RS Stock No. 119-291
  • Mfr. Part No. C10M2TM025
Each
HK$5,476.81
Temporarily out of stock
SENTRON Mounting Base for use with 3VA58/59, 3VA68/69 Series
  • RS Stock No. 263-846
  • Mfr. Part No. 3VA9873-0WN00
Each
HK$12,866.20
Temporarily out of stock
Siemens, SENTRON MCCB 3P 90A, Breaking Capacity 5 kA, Fixed Mount
  • RS Stock No. 147-600
  • Mfr. Part No. 3VA5190-4ED31-0AA0
Each
HK$4,030.60
Temporarily out of stock
Siemens SENTRON 5SY4 MCB, 3P, 15A Curve C, 400V AC, 60V DC, 20 kA Breaking Capacity
  • RS Stock No. 610-303
  • Mfr. Part No. 5SY4318-7
Each
HK$1,254.36
In Stock
ifm electronic Power Supply Module for use with Electronic Circuit Breaker
  • RS Stock No. 100-564
  • Mfr. Part No. DF1100
Each
HK$387.60
In Stock
Siemens Screw Lead Sealing for use with Cable Gland
  • RS Stock No. 203-2514
  • Mfr. Part No. 3RK1901-1MD00
Each (In a Pack of 10)
HK$24.41
Temporarily out of stock
Siemens SENTRON Cover for use with 3VA1 250
  • RS Stock No. 210-9344
  • Mfr. Part No. 3VA9253-0KB04
Each
HK$295.60
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 25A, Breaking Capacity 36 kA
  • RS Stock No. 209-6786
  • Mfr. Part No. 3VA1125-4EF32-0AA0
Each
HK$3,396.90
In Stock
Littelfuse 3.15A T Ceramic Cartridge Fuse, 5 x 20mm
  • RS Stock No. 878-1381
  • Mfr. Part No. 02153.15HXP
Each (In a Pack of 50)
HK$9.196
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