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

290 / 999+
In Stock
Littelfuse 0.75A Resettable Fuse, 33V dc
  • RS Stock No. 787-4259P
  • Mfr. Part No. 1812L075/33DR
Each (Supplied on a Reel)
MYR2.277
In Stock
Siemens 200A Centred Tag Fuse, NH2, 500V ac
  • RS Stock No. 203-2052
  • Mfr. Part No. 3NA7240
Each (In a Pack of 3)
MYR133.75
In Stock
Better World
Schneider Electric Busbar Tap-Off Unit, Canalis Series
  • RS Stock No. 211-0396
  • Mfr. Part No. KBC10DCB40
Each
MYR145.82
In Stock
ETA 2-5700 Series Circuit Breaker Terminal Shroud, IP64
  • RS Stock No. 574-845
  • Mfr. Part No. Y300.476.01 2-5000 TERMINAL SHROUD
Each
MYR16.94
In Stock
ETA Thermal Circuit Breaker - 106-P30 Single Pole 250V Voltage Rating Panel Mount, 1A Current Rating
  • RS Stock No. 336-012
  • Mfr. Part No. 106-P30-000040-1A
Each
MYR103.06
In Stock
ETA Thermal Circuit Breaker - 106-P30 Single Pole 250V Voltage Rating Panel Mount, 3A Current Rating
  • RS Stock No. 335-980
  • Mfr. Part No. 106-P30-000040-3A
Each
MYR137.65
In Stock
Phoenix Contact 1 Phase Surge Protector, 50kA, 250V ac, DIN Rail Mount
  • RS Stock No. 712-5272
  • Mfr. Part No. 2800186
Each
MYR1,691.97
Temporarily out of stock
Hager NGN MCB, 2P, 32A Curve D, 230 → 400V AC, 6 kA Breaking Capacity
  • RS Stock No. 144-4765
  • Mfr. Part No. NGN232
Each
MYR704.26
Last RS stock
Contactum MCB, 1P, 40A Curve B, 250V AC, 6 kA Breaking Capacity
  • RS Stock No. 184-9061
  • Mfr. Part No. CPB40
Each
MYR19.35
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 160A, Breaking Capacity 110 kA
  • RS Stock No. 209-6939
  • Mfr. Part No. 3VA2216-7MS32-0AA0
Each
MYR5,574.49
Temporarily out of stock
Better World
Schneider Electric Acti 9 A9F9 MCB, 4P, 16A Curve B, 400V AC, 250V DC, 20 kA, 15 kA Breaking Capacity
  • RS Stock No. 211-2500
  • Mfr. Part No. A9F93416
Each
MYR2,347.73
Temporarily out of stock
ABB, SACE Tmax XT MCCB Molded Case Circuit Breaker 3P 400A, Fixed Mount
  • RS Stock No. 231-9339
  • Mfr. Part No. 1SDA100424R1 XT5S 400 EkipDip LS/I 400
Each
MYR6,554.00
In Stock
Eaton 40A Bolted Tag Fuse, ET, 500 V dc, 690V ac, 63.5mm
  • RS Stock No. 182-1521
  • Mfr. Part No. 40ET
Each (In a Box of 10)
MYR104.291
In Stock
Eaton 2.5A T Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 169-9429
1 Bag of 1000
MYR940.35
Temporarily out of stock
Schneider Electric Multi9 M9F MCB Mini Circuit Breaker, 1P, 10A Curve C, 250V DC, 10 kA Breaking Capacity
  • RS Stock No. 654-615
  • Mfr. Part No. M9U21110
Each
MYR271.20
In Stock
Littelfuse PC Board Non Resettable Fuse, Radial 1A, 250V ac
  • RS Stock No. 895-1672
  • Mfr. Part No. 38211000410
Each (In a Pack of 10)
MYR4.475
In Stock
Schurter Thermal Circuit Breaker - T11 Single Pole 240V ac Voltage Rating, 4A Current Rating
  • RS Stock No. 284-5849
  • Mfr. Part No. 4400.0001
Each
MYR39.10
In Stock
Eaton 45A British Standard Fuse, ET, 690 V, 700 V, 63.5mm
  • RS Stock No. 182-1520
  • Mfr. Part No. 45ET
Each (In a Box of 10)
MYR96.816
Temporarily out of stock
ABB S-ARC1 MCB, 1+N, 16A Curve C, 240V AC, 6 kA Breaking Capacity
  • RS Stock No. 175-9928
  • Mfr. Part No. 2CSA255901R9164 S-ARC1 C16
Each
MYR1,068.90
Last RS stock
RS PRO SMD Non Resettable Fuse 20A, 125V
  • RS Stock No. 182-3997
Each (In a Pack of 5)
MYR6.154
1
290
2329
Results per page

Related links