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

208 of 999+
Temporarily out of stock
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 80A, Breaking Capacity 25 kA, DIN Rail Mount
  • RS Stock No. 271-9618
  • Mfr. Part No. 3VA10803ED360AA0
Each
HK$3,386.20
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 25A, Breaking Capacity 85 kA, Fixed Mount
  • RS Stock No. 209-5154
  • Mfr. Part No. 3VA2125-6KP32-0AA0
Each
HK$14,500.40
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 160A, Breaking Capacity 200 kA, Fixed Mount
  • RS Stock No. 270-4058
  • Mfr. Part No. 3VA2116-0HN32-0AA0
Each
HK$16,220.60
Temporarily out of stock
Siemens, SENTRON MCCB 4P 100A, Breaking Capacity 16 kA, Fixed Mount
  • RS Stock No. 271-9552
  • Mfr. Part No. 3VA10102ED420AA0
Each
HK$4,502.70
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 20A, Breaking Capacity 25 kA
  • RS Stock No. 209-6769
  • Mfr. Part No. 3VA1120-3EF42-0AA0
Each
HK$4,047.70
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 16A, Breaking Capacity 25 kA, Fixed Mount
  • RS Stock No. 874-4351
  • Mfr. Part No. 3VA1196-3EE36-0AA0
Each
HK$3,285.70
Temporarily out of stock
RS PRO 3 Phase Industrial Surge Protector, 25kA, 1.25kV, DIN Rail Mount
  • RS Stock No. 101-747
Each
HK$1,872.69
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 40A, Breaking Capacity 150 kA, Fixed Mount
  • RS Stock No. 270-3796
  • Mfr. Part No. 3VA2040-8HL46-0AA0
Each
HK$11,771.90
In Stock
Mersen 1kA size 33 FF Square Body Fuse, aR, 700V
  • RS Stock No. 304-2243
  • Mfr. Part No. B300082
Each
HK$2,896.90
Temporarily out of stock
Schneider Electric Acti9 A9N1 MCB, 1P, 100A Curve B, 230-400V AC, 144V DC, 4.5 kA Breaking Capacity
  • RS Stock No. 212-214
  • Mfr. Part No. A9N18403
Each
HK$1,013.33
In Stock
Littelfuse 20A Panel Mount Fuse Holder for ATO Fuse, 32V dc
  • RS Stock No. 787-4233P
  • Mfr. Part No. 01550320ZXU
Each (Supplied in a Bag)
HK$27.60
In Stock
Bourns 1.35A Resettable Fuse, 72V
  • RS Stock No. 647-8695P
  • Mfr. Part No. MF-RX135/72-0
Each (Supplied in a Bag)
HK$2.95
Temporarily out of stock
ABB MCCB Molded Case Circuit Breaker 4P 630A, Fixed Mount
  • RS Stock No. 250-4140
  • Mfr. Part No. 1SDA054410R1
Each
HK$44,407.74
In Stock
Phoenix Contact CB-E1 Electronic Circuit breaker 4A 24V CB E1, On Base Element
  • RS Stock No. 217-6386
  • Mfr. Part No. 2800925
Each
HK$407.20
In Stock
Schurter 16A Panel Mount Fuse Holder for 5 x 20mm Fuse, 1P, 250V ac
  • RS Stock No. 384-055
  • Mfr. Part No. 3101.0020
Each (In a Pack of 5)
HK$31.32
Temporarily out of stock
Siemens SENTRON 1 Phase Busbar, 230V, 18mm Pitch
  • RS Stock No. 187-5238
  • Mfr. Part No. 5ST3786-0
Each
HK$646.10
Temporarily out of stock
SENTRON Plate for use with 3VA51 Series
  • RS Stock No. 263-956
  • Mfr. Part No. 3VA9131-0WJ30
Each
HK$128.60
Temporarily out of stock
Siemens SENTRON Adapter for use with For TD400
  • RS Stock No. 265-574
  • Mfr. Part No. 3VW9011-0AT43
Each
HK$2,151.30
Temporarily out of stock
Schneider Electric ComPacT Insulation accessory for use with Compact NSX 400-630 AC
  • RS Stock No. 346-631
  • Mfr. Part No. LV4344AHT
Each
HK$873.52
In Stock
Schneider Electric, ComPacT MCCB 4P 160A, Fixed Mount
  • RS Stock No. 260-8053
  • Mfr. Part No. C25W42D160
Each
HK$33,145.73
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