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

186 of 999+
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 100A, Breaking Capacity 85 kA, Fixed Mount
  • RS Stock No. 270-3960
  • Mfr. Part No. 3VA2110-6JP46-0AA0
Each
HK$16,647.10
Temporarily out of stock
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 50A, Breaking Capacity 36 kA, DIN Rail Mount
  • RS Stock No. 271-9355
  • Mfr. Part No. 3VA1150-4ED46-0AA0
Each
HK$4,347.20
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 16A, Breaking Capacity 36 kA, Fixed Mount
  • RS Stock No. 271-9633
  • Mfr. Part No. 3VA10964ED460AA0
Each
HK$4,111.30
In Stock
Better World
Schneider Electric Surge Arrester, 40kA, 800V ac, DIN Rail Mount
  • RS Stock No. 219-8275
  • Mfr. Part No. A9L40271
Each
HK$1,870.20
In Stock
Bulgin 6.3A Panel Mount Fuse Holder for 5 x 20mm Fuse, 1P, 250V ac
  • RS Stock No. 122-2598
  • Mfr. Part No. FX0345
Each
HK$84.60
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 80A, Breaking Capacity 25 kA, Fixed Mount
  • RS Stock No. 271-9411
  • Mfr. Part No. 3VA1180-3GD42-0AA0
Each
HK$4,137.70
Temporarily out of stock
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 80A, Breaking Capacity 36 kA, DIN Rail Mount
  • RS Stock No. 271-9420
  • Mfr. Part No. 3VA1180-4GD42-0AA0
Each
HK$4,311.50
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 1P 63A, Breaking Capacity 55 kA, Fixed Mount
  • RS Stock No. 271-9392
  • Mfr. Part No. 3VA1163-5ED12-0AA0
Each
HK$1,677.80
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 63A, Breaking Capacity 200 kA, Fixed Mount
  • RS Stock No. 270-4688
  • Mfr. Part No. 3VA2163-0HM32-0AA0
Each
HK$13,079.70
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 32A, Breaking Capacity 36 kA, Fixed Mount
  • RS Stock No. 271-9892
  • Mfr. Part No. 3VA1132-4GE42-0AA0
Each
HK$4,011.50
In Stock
Better World
Siemens, SENTRON MCCB 3P 80A, Breaking Capacity 36 kA
  • RS Stock No. 209-6743
  • Mfr. Part No. 3VA1080-4ED32-0AA0
Each
HK$3,024.00
Temporarily out of stock
Siemens Connecting Terminals, 5SH Series
  • RS Stock No. 300-089
  • Mfr. Part No. 5SH3535
Each
HK$1,156.40
Temporarily out of stock
Hager MMN MCB, 3P, 63A, 400V AC, 15 kA Breaking Capacity
  • RS Stock No. 602-133
  • Mfr. Part No. MMN363
Each
HK$6,271.60
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 25A, Breaking Capacity 25 kA, Fixed Mount
  • RS Stock No. 271-9845
  • Mfr. Part No. 3VA1125-3ED46-0AA0
Each
HK$4,031.80
Temporarily out of stock
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 3P 100A, Breaking Capacity 5 kA, Fixed Mount
  • RS Stock No. 229-635
  • Mfr. Part No. 107821 NZMH2-AF100-BT-NA
Each
HK$8,221.82
Temporarily out of stock
SENTRON Locking Device for use with 3VA41 Series
  • RS Stock No. 263-828
  • Mfr. Part No. 3VA9038-0LB11
Each
HK$623.40
Temporarily out of stock
Better World
Schneider Electric TeSys Thermal Circuit Breaker - GV4L 3 Pole 690V ac Voltage Rating, 25A Current Rating
  • RS Stock No. 175-1440
  • Mfr. Part No. GV4L25N6
Each
HK$4,689.02
Temporarily out of stock
Hager MMN MCB, 2P, 40A, 400V AC, 20 kA Breaking Capacity
  • RS Stock No. 602-121
  • Mfr. Part No. MMN240
Each
HK$3,457.10
Temporarily out of stock
Hager HMX MCB, 4P, 16A, 400V AC, 50 Breaking Capacity
  • RS Stock No. 602-239
  • Mfr. Part No. HMX416
Each
HK$7,692.10
Temporarily out of stock
Siemens 32A Diazed Fuse, gG, 500/440V ac/dc
  • RS Stock No. 163-284
  • Mfr. Part No. 5SB4011
1 Pack of 25
HK$407.30
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