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

233 of 999+
Temporarily out of stock
Siemens SENTRON Wire Connector for use with 3VA1
  • RS Stock No. 269-7059
  • Mfr. Part No. 3VA9112-0JF60
Each (In a Pack of 2)
HK$470.90
In Stock
Siemens Sentron Adapter for use with Busbar
  • RS Stock No. 228-8245
  • Mfr. Part No. 8US1261-5FM08
Each
HK$387.70
Temporarily out of stock
Better World
Siemens SENTRON 3VA9 Wire Connector for use with 3VA15/25 1000
  • RS Stock No. 218-1865
  • Mfr. Part No. 3VA9504-0JB32
Each
HK$3,358.10
Temporarily out of stock
Siemens SENTRON Terminal for use with 3VA1 400/630 and 3VA2 400/630
  • RS Stock No. 210-9390
  • Mfr. Part No. 3VA9403-0QE00
Each
HK$1,278.40
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
In Stock
ETA for use with Terminal Block
  • RS Stock No. 729-2877
  • Mfr. Part No. 17-P10-Si
Each
HK$223.60
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
Schneider Electric Busbar Tap-Off Unit with Circuit Breaker
  • RS Stock No. 219-8944
  • Mfr. Part No. KSB250DC4
Each
HK$16,097.03
Temporarily out of stock
Siemens 3RV29 Phase Barrier for use with Circuit breaker
  • RS Stock No. 211-5964
  • Mfr. Part No. 3RV2938-1K
Each
HK$255.50
Temporarily out of stock
Siemens SENTRON Connection Unit for use with 3VA4/5 125
  • RS Stock No. 269-7091
  • Mfr. Part No. 3VA9133-0QB00
Each (In a Pack of 3)
HK$157.20
Temporarily out of stock
Siemens SENTRON Communication Module for use with 3VA2 400/630/1000
  • RS Stock No. 210-9383
  • Mfr. Part No. 3VA9387-0TB10
Each
HK$4,245.30
Temporarily out of stock
Siemens SENTRON Motor Operator for use with 3VA2 100/160/250
  • RS Stock No. 216-4374
  • Mfr. Part No. 3VA9267-0HA10
Each
HK$7,450.40
Temporarily out of stock
Siemens SENTRON 3VA9 LCD display for use with 3VA breakers
  • RS Stock No. 218-1875
  • Mfr. Part No. 3VA9987-0TD10
Each
HK$8,824.30
In Stock
Siemens Busbar
  • RS Stock No. 127-1497
  • Mfr. Part No. 3RV2915-5B
Each
HK$361.40
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
In Stock
Siemens 3RV2917 Terminal Block for use with Power Outlet
  • RS Stock No. 203-3861
  • Mfr. Part No. 3RV2917-5FA00
Each
HK$209.80
Temporarily out of stock
Siemens SENTRON Cover for use with 3VA1 100/160
  • RS Stock No. 210-9297
  • Mfr. Part No. 3VA9153-0KB05
Each
HK$377.60
Temporarily out of stock
ABB High Performance S800N MCB, 1P, 80A Curve C, 400V AC, 36 kA Breaking Capacity
  • RS Stock No. 435-342
  • Mfr. Part No. 2CCG001226R0001
Each
HK$575.15
Temporarily out of stock
Siemens SENTRON 3VA9 Rotary Operator for use with 3VA1 250
  • RS Stock No. 218-1839
  • Mfr. Part No. 3VA9257-0PK17
Each
HK$2,442.10
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