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

46935 Products showing for Fuses & Circuit Breakers

2242 of 999+
Temporarily out of stock
Mersen 80A Bolted Tag Fuse, B1C, 240 V dc, 415V ac, 111mm
  • RS Stock No. 178-1057
  • Mfr. Part No. Y1045302 / BTC42V80/10
Each (In a Pack of 10)
HK$189.335
Temporarily out of stock
Better World
ABB Emax2 Electronic Circuit Breaker 2.5kA Ekip Dip LI, 3 channels
  • RS Stock No. 259-3233
  • Mfr. Part No. 1SDA071121R1
Each
HK$128,579.99
Temporarily out of stock
Siemens ALPHA Assembly Kit for use with Door Mounted Rotary Operator
  • RS Stock No. 629-197
  • Mfr. Part No. 8GK4720-3KK20
Each
HK$1,395.83
Temporarily out of stock
Hager RCBO, 10A Current Rating, 1P+N Poles, 30mA Trip Sensitivity, Type F
  • RS Stock No. 602-227
  • Mfr. Part No. ADF810F
Each
HK$3,431.10
Temporarily out of stock
Siemens, SENTRON MCCB 3P 150A, Breaking Capacity 7 kA, Fixed Mount
  • RS Stock No. 147-907
  • Mfr. Part No. 3VA5215-5ED31-2AA0
Each
HK$13,470.10
Temporarily out of stock
ABB System Pro M Compact S200 MCB, 1P, 100A Curve C, 440V AC, 60V DC, 6 kA Breaking Capacity
  • RS Stock No. 231-9669
  • Mfr. Part No. 2CDS251001R0824 S201-C100 6kA
1 Box of 1
HK$582.30
Temporarily out of stock
Siemens 30A Rail Mount Fuse Holder, 3P, 600V
  • RS Stock No. 225-5431
  • Mfr. Part No. 3NW7431-0HG
Each
HK$1,120.80
Temporarily out of stock
Schneider Electric, ComPacT MCCB 4P 160A, Fixed Mount
  • RS Stock No. 260-7988
  • Mfr. Part No. C25R4TM160
Each
HK$31,195.59
Temporarily out of stock
Eaton 500mA Cartridge Fuse, 142 x 20.6mm
  • RS Stock No. 261-587
  • Mfr. Part No. 5.5AMWNA0.5E
1 Pack of 10
HK$15,451.50
In Stock
Better World
Schneider Electric Acti 9 iC60N MCB, 2P, 10A Curve C, 400V AC, 12 → 144V DC, 6 kA Breaking Capacity
  • RS Stock No. 734-9068
  • Mfr. Part No. A9F77210
Each
HK$859.80
In Stock
Eaton 2A T Ceramic Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 852-7061
  • Mfr. Part No. MDA-2-R
Each
HK$24.20
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 40A, Breaking Capacity 110 kA, Fixed Mount
  • RS Stock No. 270-4671
  • Mfr. Part No. 3VA2140-7KP46-0AA0
Each
HK$19,170.60
Temporarily out of stock
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 100A, Breaking Capacity 100 kA, Fixed Mount
  • RS Stock No. 269-816
  • Mfr. Part No. 3VA6110-7KM41-2AA0
Each
HK$25,363.00
Temporarily out of stock
ABB System Pro M Compact S300P MCB, 1+N, 1.6A Curve C, 240V AC, 72V DC, 100 kA Breaking Capacity
  • RS Stock No. 204-238
  • Mfr. Part No. 2CDS381103R0974
Each
HK$1,779.27
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 800A, Breaking Capacity 35 kA, Fixed Mount
  • RS Stock No. 249-972
  • Mfr. Part No. 3VA6580-5JQ36-2AA0
Each
HK$65,876.90
Temporarily out of stock
Schurter TA36 Rocker Circuit Breaker - TA36 2 Pole 60 V dc, 277 V ac Voltage Rating, 16A Current Rating
  • RS Stock No. 221-5619
  • Mfr. Part No. 3-128-231
1 Box of 10
HK$1,377.80
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 63A, Breaking Capacity 150 kA, Fixed Mount
  • RS Stock No. 270-3898
  • Mfr. Part No. 3VA2063-8HN42-0AA0
Each
HK$12,183.20
Temporarily out of stock
Schneider Electric, PowerPact Circuit breaker 1P 125A, Breaking Capacity 35 kA, DIN Rail Mount
  • RS Stock No. 357-683
  • Mfr. Part No. BGF16125
Each
HK$8,530.60
In Stock
Schneider Electric Multi9 M9F1 MCB, 1P, 2A Curve B, 415V AC, 72V DC, 3 kA Breaking Capacity
  • RS Stock No. 212-190
  • Mfr. Part No. M9F10102
Each
HK$197.43
In Stock
Eaton 750mA T Glass Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 412-469
  • Mfr. Part No. TDC11-750MA
Each (In a Pack of 10)
HK$10.16
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