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

2363 of 999+
Temporarily out of stock
Eaton Undervoltage Release for use with Circuit Breaker
  • RS Stock No. 282-7134
  • Mfr. Part No. 284387 NZM1-XUHIV20KL24DC
Each
HK$1,953.91
Temporarily out of stock
Eaton 160A Fuse Holder for 135 x 715mm Fuse, 3P, 690V
  • RS Stock No. 262-016
  • Mfr. Part No. EBF00330V0
Each
HK$1,184.60
Temporarily out of stock
Better World
Schneider Electric Acti 9 Acti9 iDT40N XA MCB, 1+N, 25A Curve C, 230V AC
  • RS Stock No. 238-3435
  • Mfr. Part No. A9PA4625
Each
HK$1,171.40
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 25A, Breaking Capacity 110 kA, Fixed Mount
  • RS Stock No. 270-3678
  • Mfr. Part No. 3VA2025-7JP36-0AA0
Each
HK$26,336.40
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 100A, Breaking Capacity 110 kA, Fixed Mount
  • RS Stock No. 270-3570
  • Mfr. Part No. 3VA2010-7HL46-0AA0
Each
HK$21,639.40
Temporarily out of stock
Siemens, SENTRON MCCB 4P 100A, Breaking Capacity 55 kA, Fixed Mount
  • RS Stock No. 270-4777
  • Mfr. Part No. 3VA2510-5JP42-0AA0
Each
HK$117,422.90
Temporarily out of stock
Contactum 16 Way Steel Consumer Unit, 100A Defender
  • RS Stock No. 184-9130
  • Mfr. Part No. DDS16188MS
Each
HK$1,558.31
Temporarily out of stock
ABB System Pro M Compact S300P MCB, 3P, 16A, Type Z, 415V AC, 25 kA Breaking Capacity
  • RS Stock No. 204-276
  • Mfr. Part No. 2CDS383001R0468
Each
HK$3,139.88
Temporarily out of stock
400A Fuse Holder for 195 x 675mm Fuse, 3P, 690V
  • RS Stock No. 262-647
  • Mfr. Part No. EBV233SW1
Each
HK$3,512.60
Temporarily out of stock
Eaton Moeller xEffect Busbar, 30V dc, 17.5mm Pitch
  • RS Stock No. 262-474
  • Mfr. Part No. PXS24BB00004 PXS24-BB/80A/4TE
Each
HK$24.40
Temporarily out of stock
Better World
Schneider Electric, Compact MCCB 3P 25A, Breaking Capacity 36 kA, DIN Rail Mount
  • RS Stock No. 178-7974
  • Mfr. Part No. LV426770
Each
HK$8,993.87
Temporarily out of stock
Better World
Schneider Electric MCCB 4P, Fixed Mount
  • RS Stock No. 178-7892
  • Mfr. Part No. LV426947
Each
HK$530.56
Temporarily out of stock
Phoenix Contact 1 Phase Surge Protector, 10kA, DIN Rail Mount
  • RS Stock No. 201-5545
  • Mfr. Part No. 2909592
Each
HK$1,470.70
In Stock
Eaton xEffect MCB, 4P, 2A Curve B
  • RS Stock No. 230-0893
  • Mfr. Part No. 177423 FAZ6-B2/4
Each
HK$1,229.48
Temporarily out of stock
Lovato 1 Phase Surge Protector, 5kA
  • RS Stock No. 216-8295
  • Mfr. Part No. SA31NA320R
Each
HK$945.01
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 125A, Breaking Capacity 70 kA, Fixed Mount
  • RS Stock No. 271-9746
  • Mfr. Part No. 3VA1112-6GD46-0AA0
Each
HK$8,610.40
Temporarily out of stock
Electronic Circuit Breaker 4A 24V , 1 channels , DIN Rail
  • RS Stock No. 262-477
  • Mfr. Part No. PXS24E04A002 PXS24E-e4/F
Each
HK$374.80
Temporarily out of stock
Eaton Moeller Series NZM Connection Unit for use with N4, NZM4
  • RS Stock No. 255-997
  • Mfr. Part No. 266842 NZM4-XKR
Each
HK$2,118.30
Temporarily out of stock
Eaton 630A Fuse Holder for 195 x 675mm Fuse, 3P, 690V
  • RS Stock No. 261-717
  • Mfr. Part No. EBV333TW1
Each
HK$3,749.50
Temporarily out of stock
NH Protection Kit for use with NH00
  • RS Stock No. 261-994
  • Mfr. Part No. TD00-IP20 NH00 IP20 Triple Pole Protection kit
Each
HK$86.90
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