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
Fuses - PCB
Fuses - PCB

46578 Products showing for Fuses & Circuit Breakers

218 / 999+
Temporarily out of stock
Siemens, Sentron MCCB Molded Case Circuit Breaker 4P 1kA, Breaking Capacity 25 kA, Cable Mount
  • RS Stock No. 249-223
  • Mfr. Part No. 3VA6610-5HM46-0AA0
Each
MYR50,135.51
In Stock
Better World
Schneider Electric Acti 9 iC60H MCB Mini Circuit Breaker, 2P, 6A Curve B, 12 → 133 V, 220 → 240 V, 380
  • RS Stock No. 791-3180
  • Mfr. Part No. A9F53206
Each
MYR918.97
Temporarily out of stock
ABB Auxiliary Contact for use with Tmax XT
  • RS Stock No. 237-6202
  • Mfr. Part No. 1SDA066995R1
Each
MYR207.54
Temporarily out of stock
Better World
Siemens SENTRON Electronic Circuit Breaker 400A 3VA, 3 channels
  • RS Stock No. 155-861
  • Mfr. Part No. 3VA2440-7KP32-0AA0
Each
MYR21,899.30
In Stock
nVent SCHROFF Earthing Kit
  • RS Stock No. 721-2994
  • Mfr. Part No. 24571380
1 Kit
MYR52.94
In Stock
Phoenix Contact Surge Protector, 250V (Volts), DIN Rail Mount
  • RS Stock No. 536-006
  • Mfr. Part No. 2882925
Each
MYR842.13
Temporarily out of stock
ABB Emax2 Electronic Circuit Breaker 4kA 1SDA07, 3 channels
  • RS Stock No. 259-3320
  • Mfr. Part No. 1SDA071228R1
Each
MYR151,469.93
Temporarily out of stock
Schneider Electric Tee Elbow Busbar Trunking, 290mm, 630A, KSA Series
  • RS Stock No. 653-926
  • Mfr. Part No. KSA630DLE401
Each
MYR9,697.46
Temporarily out of stock
Better World
Siemens SENTRON 5SY7 MCB, 2P, 63A Curve B, 400V AC, 72V DC, 5 kA Breaking Capacity
  • RS Stock No. 212-8969
  • Mfr. Part No. 5SY7263-6
Each
MYR690.87
In Stock
Better World
Schneider Electric Acti 9 C60H-DC MCB, 1P, 13A Curve C, 250V DC, 20 kA Breaking Capacity
  • RS Stock No. 776-3165
  • Mfr. Part No. A9N61509
Each
MYR271.54
Temporarily out of stock
Eaton 120V60HZ), MSC-DE-12-M17-SP(110V50HZ Electronic Circuit Breaker 16.7A , DIN Rail
  • RS Stock No. 120-888
  • Mfr. Part No. 167804 MSC-DE-12-M17-SP(110V50HZ,120V60HZ)
Each
MYR1,561.86
Temporarily out of stock
Eaton IZMX/INX Electronic Circuit Breaker 1.6kA IZMX/INX, 3 channels , Fixed
  • RS Stock No. 127-547
  • Mfr. Part No. 183473 IZMX16B3-P16W-1
Each
MYR60,909.28
In Stock
Omron Busbar
  • RS Stock No. 111-3528
  • Mfr. Part No. PYDN-7.75-200R
Each
MYR25.28
Temporarily out of stock
Better World
Schneider Electric Busbar End Feed Unit, Canalis KS Series
  • RS Stock No. 211-0475
  • Mfr. Part No. KSA630ABG4
Each
MYR11,749.49
Temporarily out of stock
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 100A, Breaking Capacity 25 kA, DIN Rail Mount
  • RS Stock No. 271-9642
  • Mfr. Part No. 3VA11103FD420AA0
Each
MYR2,584.90
Temporarily out of stock
Socomec 500A NH Fuse, 4, 500V
  • RS Stock No. 252-5349
  • Mfr. Part No. 67460500
Each
MYR983.70
In Stock
Better World
Schneider Electric Surge Protector, 20kA, DIN Rail Mount
  • RS Stock No. 776-3834
  • Mfr. Part No. A9L16618
Each
MYR3,054.94
In Stock
Eaton xEffect MCB, 2P, 8A Curve B, 240 → 415V AC, 10 kA Breaking Capacity
  • RS Stock No. 847-3190
  • Mfr. Part No. 278729 FAZ-B8/2
Each
MYR404.88
In Stock
RS PRO Single Phase Industrial Surge Protector, 50kA, 1.25kV, DIN Rail Mount
  • RS Stock No. 101-800
Each
MYR205.54
Temporarily out of stock
Siemens 10V ac Auxiliary Switch
  • RS Stock No. 223-7680
  • Mfr. Part No. 5TT4930
Each
MYR202.36
1
218
2329
Results per page

Related links