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

234 of 999+
Temporarily out of stock
Siemens SENTRON Wire Connector for use with 3VA15/3VA25
  • RS Stock No. 269-7236
  • Mfr. Part No. 3VA9604-0JJ44
Each (In a Pack of 4)
HK$1,407.175
Temporarily out of stock
Siemens SENTRON Long Rear Connection for use with 3VA9603
  • RS Stock No. 269-7229
  • Mfr. Part No. 3VA9603-0QE01
Each (In a Pack of 3)
HK$784.133
Temporarily out of stock
Siemens SENTRON Cover for use with 3VA2 100/160/250
  • RS Stock No. 210-9334
  • Mfr. Part No. 3VA9221-0WG30
Each
HK$481.90
Temporarily out of stock
Siemens SENTRON Busbar Protector for use with 3VA15/25 1000
  • RS Stock No. 210-9411
  • Mfr. Part No. 3VA9604-0QA00
Each
HK$1,240.10
Temporarily out of stock
Siemens SENTRON Front Plate for use with 3VA1 100/160
  • RS Stock No. 210-9303
  • Mfr. Part No. 3VA9154-0KB05
Each
HK$514.10
Temporarily out of stock
Siemens SENTRON Control Wire Tap for use with 3VA1 100/160
  • RS Stock No. 210-9294
  • Mfr. Part No. 3VA9150-0WB00
Each (In a Pack of 10)
HK$97.16
Temporarily out of stock
Siemens SENTRON Wire Connector for use with 3VA1 100/160
  • RS Stock No. 210-9287
  • Mfr. Part No. 3VA9114-0JJ12
Each
HK$941.50
Temporarily out of stock
Better World
Siemens SENTRON Terminal for use with 3VA1 250
  • RS Stock No. 210-9340
  • Mfr. Part No. 3VA9253-0JA11
Each
HK$294.80
In Stock
Siemens SIRIUS Connection Plug for use with Contactors
  • RS Stock No. 216-5984
  • Mfr. Part No. 3RV2917-5C
Each (In a Pack of 10)
HK$97.65
Temporarily out of stock
Siemens SIRIUS Cover for use with 3RV2
  • RS Stock No. 216-5983
  • Mfr. Part No. 3RV2901-0H
Each (In a Pack of 10)
HK$111.89
Temporarily out of stock
Siemens SENTRON Connection Unit for use with 3VA5 250, 3VA6 150/250
  • RS Stock No. 269-7175
  • Mfr. Part No. 3VA9273-0QB00
Each (In a Pack of 3)
HK$174.067
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 Phase Barrier for use with 3VA9603-0KP00
  • RS Stock No. 269-7215
  • Mfr. Part No. 3VA9602-0WA05
Each (In a Pack of 2)
HK$207.45
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 SENTRON 3VA9 Wire Connector for use with 3VA2 100/160/250
  • RS Stock No. 218-1841
  • Mfr. Part No. 3VA9264-0QB00
Each
HK$579.20
In Stock
Siemens SENTRON 3VA9 Rotary Operator for use with 3VA1 250
  • RS Stock No. 218-1838
  • Mfr. Part No. 3VA9257-0GK00
Each
HK$629.50
Temporarily out of stock
Siemens SENTRON 3VA9 Cover for use with 3VA1 250
  • RS Stock No. 218-1833
  • Mfr. Part No. 3VA9254-0KB04
Each
HK$388.20
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
Temporarily out of stock
Siemens SENTRON Nut Keeper Kit for use with 3VA1 250
  • RS Stock No. 210-9325
  • Mfr. Part No. 3VA9213-0QA00
Each
HK$273.80
Temporarily out of stock
Siemens SENTRON 3VA9 Wire Connector for use with 3VA1 100/160
  • RS Stock No. 218-1793
  • Mfr. Part No. 3VA9114-0QA00
Each
HK$332.00
1
234
2364
Results per page

Related links