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

156 of 999+
Temporarily out of stock
Siemens SENTRON Undervoltage Release
  • RS Stock No. 277-0739
  • Mfr. Part No. 3WA9111-0AE13
Each
HK$7,170.90
Temporarily out of stock
Eaton Distribution Parts Rigid Wire Jumper for use with Distribution Parts
  • RS Stock No. 252-819
  • Mfr. Part No. 215615 RVS-1PHAS+N/125
1 Pack of 3
HK$131.60
Temporarily out of stock
Better World
Siemens SENTRON Electronic Circuit Breaker 25A 3VA2, 4 channels
  • RS Stock No. 157-398
  • Mfr. Part No. 3VA2125-8HM42-0AA0
Each
HK$15,730.80
Temporarily out of stock
Better World
Siemens SENTRON Electronic Circuit Breaker 25A 3VA2, 4 channels
  • RS Stock No. 157-190
  • Mfr. Part No. 3VA2125-8JQ42-0AA0
Each
HK$22,607.20
Temporarily out of stock
Better World
Siemens SENTRON Electronic Circuit Breaker 25A 3VA2, 4 channels
  • RS Stock No. 157-195
  • Mfr. Part No. 3VA2125-8KP42-0AA0
Each
HK$20,534.80
Temporarily out of stock
Eaton xEnergy Main Busbar Support for use with Busbar
  • RS Stock No. 247-214
  • Mfr. Part No. 133071 XNNS-30X15
1 Pack of 5
HK$3,575.50
Temporarily out of stock
Better World
Siemens SENTRON Electronic Circuit Breaker 25A 3VA2, 3 channels
  • RS Stock No. 157-189
  • Mfr. Part No. 3VA2125-8JQ36-0AA0
Each
HK$19,592.90
Temporarily out of stock
Siemens SENTRON Cover Frame for use with 3VA55/65/66
  • RS Stock No. 162-029
  • Mfr. Part No. 3VA9583-0SB20
Each
HK$953.20
Temporarily out of stock
Better World
Siemens SENTRON Electronic Circuit Breaker 400A 3VA2, 4 channels
  • RS Stock No. 156-839
  • Mfr. Part No. 3VA2340-0HN42-0AA0
Each
HK$33,700.70
Temporarily out of stock
Better World
Siemens SENTRON Electronic Circuit Breaker 63A 3VA2, 4 channels
  • RS Stock No. 157-213
  • Mfr. Part No. 3VA2163-8HL42-0AA0
Each
HK$12,339.80
Temporarily out of stock
Better World
Siemens SENTRON Electronic Circuit Breaker 40A 3VA2, 3 channels
  • RS Stock No. 157-419
  • Mfr. Part No. 3VA2140-8JQ36-0AA0
Each
HK$19,592.90
Temporarily out of stock
Eaton Eaton xEnergy Main End cap for Busbar for use with Busbar
  • RS Stock No. 231-797
  • Mfr. Part No. 121454 XBI-120
1 Pack of 8
HK$477.20
Temporarily out of stock
SENTRON Wire Connector for use with 3VA58, 3VA68 Series
  • RS Stock No. 263-918
  • Mfr. Part No. 3VA9771-0JJ44
Each
HK$5,601.10
Temporarily out of stock
SENTRON Terminal for use with 3VA25 Series
  • RS Stock No. 263-895
  • Mfr. Part No. 3VA9603-0QE00
1 Kit
HK$1,973.50
Temporarily out of stock
SENTRON Wire Connector for use with 3VA55, 3VA65/66 Series
  • RS Stock No. 263-718
  • Mfr. Part No. 3VA9674-0JJ43
1 Kit
HK$5,287.20
Temporarily out of stock
Better World
Siemens SENTRON Electronic Circuit Breaker 25A 3VA2, 3 channels
  • RS Stock No. 157-183
  • Mfr. Part No. 3VA2125-8JP32-0AA0
Each
HK$15,825.00
Temporarily out of stock
Siemens SENTRON Connection Unit for use with For Circuit Breaker
  • RS Stock No. 265-637
  • Mfr. Part No. 8US1921-1CF02
Each
HK$256.20
Temporarily out of stock
SENTRON Cover Frame for use with 3VA57/58/59, 3VA67/68/69
  • RS Stock No. 263-852
  • Mfr. Part No. 3VA9877-0SB10
Each
HK$684.80
Temporarily out of stock
SENTRON Wire Connector for use with 3VA61/62 Series
  • RS Stock No. 264-000
  • Mfr. Part No. 3VA9244-0JG12
1 Kit
HK$772.90
Temporarily out of stock
Better World
Siemens SENTRON Electronic Circuit Breaker 160A 3VA2, 4 channels
  • RS Stock No. 156-652
  • Mfr. Part No. 3VA2216-5KQ42-0AA0
Each
HK$24,051.10
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