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

46578 Products showing for Fuses & Circuit Breakers

250 / 999+
In Stock
Mersen 20A NH Fuse, NH000, 690V ac
  • RS Stock No. 270-3122
  • Mfr. Part No. V227856
Each
MYR91.07
In Stock
Hager 2A Cartridge Fuse, 14 x 51mm
  • RS Stock No. 250-8616
  • Mfr. Part No. LF402G
Each (In a Pack of 10)
MYR26.143
Temporarily out of stock
Siemens, SENTRON MCCB 4P 250A, Breaking Capacity 7 kA, Fixed Mount
  • RS Stock No. 147-823
  • Mfr. Part No. 3VA5225-5EC41-0AA0
Each
MYR9,152.66
Unavailable
Schneider Electric ComPact Trip Unit for use with Compact NSX 100/160/250 circuit breakers
  • RS Stock No. 221-0929
  • Mfr. Part No. LV429116
Each
MYR9,409.70
In Stock
Phoenix Contact Electronic Circuit Breaker 8A 12 → 24V, 1 channels , Plug-On
  • RS Stock No. 269-8046
  • Mfr. Part No. 1157279
Each
MYR279.52
Temporarily out of stock
Better World
Siemens SENTRON Electronic Circuit Breaker 400A 3VA2, 4 channels
  • RS Stock No. 156-626
  • Mfr. Part No. 3VA2440-8JP42-0AA0
Each
MYR30,430.80
Temporarily out of stock
Better World
Schneider Electric Acti 9 C120N MCB, 3P, 63A Curve D, 440V AC, 375V DC, 10 kA, 20 kA Breaking Capacity
  • RS Stock No. 776-3089
  • Mfr. Part No. A9N18386
Each
MYR1,750.46
In Stock
Better World
Siemens SENTRON Cover for use with 3VA1 250
  • RS Stock No. 210-9317
  • Mfr. Part No. 3VA9211-0WF30
Each
MYR244.58
In Stock
Siemens 63A Bolted Tag Fuse, NH000, 690V
  • RS Stock No. 210-6982
  • Mfr. Part No. 3NE8718-1
Each (In a Pack of 10)
MYR329.157
Temporarily out of stock
Siemens SENTRON Trip Unit
  • RS Stock No. 277-0954
  • Mfr. Part No. 3WA9111-0EM61
Each
MYR1,724.88
In Stock
RS PRO 16A T Ceramic Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 209-9311
Each (In a Pack of 10)
MYR6.815
In Stock
Better World
Siemens SENTRON 5SL4 MCB, 1P, 4A Curve B, 10 kA Breaking Capacity
  • RS Stock No. 202-7171
  • Mfr. Part No. 5SL4104-6
Each
MYR120.92
Temporarily out of stock
Better World
ABB Emax 2 MCB, 3P, 800A, 690V AC, 66 kA Breaking Capacity
  • RS Stock No. 225-5871
  • Mfr. Part No. 1SDA070765R1 E1.2N 800 Ekip Touch LSI 3
Each
MYR29,902.47
Temporarily out of stock
ABB Emax2 Electronic Circuit Breaker 1.6kA 1SDA07, 3 channels
  • RS Stock No. 259-4243
  • Mfr. Part No. 1SDA072368R1
Each
MYR56,778.01
Temporarily out of stock
Schneider Electric, ComPacT MCCB 3P 100A, Fixed Mount
  • RS Stock No. 260-7454
  • Mfr. Part No. C10V35E100
Each
MYR13,591.14
In Stock
Better World
Schneider Electric Multi 9 MCB, 2P, 10A Curve C, 10 kA Breaking Capacity
  • RS Stock No. 219-9126
  • Mfr. Part No. M9F22210
Each
MYR949.25
In Stock
Mersen 10A Offset Tag Fuse, 9.4 x 47mm
  • RS Stock No. 209-6420
  • Mfr. Part No. G1065688 / BLST24V10
Each (In a Pack of 10)
MYR14.504
Temporarily out of stock
Siemens ALPHA Adapter Kit for use with 400/630 DIN Bus-mounting fuse
  • RS Stock No. 210-1769
  • Mfr. Part No. 8GK4801-2KK12
Each
MYR1,096.28
Temporarily out of stock
Better World
Siemens SENTRON Electronic Circuit Breaker 500A 3VA, 3 channels
  • RS Stock No. 156-749
  • Mfr. Part No. 3VA2440-0MQ32-0AA0
Each
MYR22,823.10
In Stock
Legrand RCCB, 40A, 2 Pole, 30mA, Type F, 230V
  • RS Stock No. 266-1361
  • Mfr. Part No. 411644
Each
MYR1,400.97
1
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