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

142 / 999+
Littelfuse 2A F Ceramic Cartridge Fuse, 5 x 20mm
  • RS Stock No. 541-4628
  • Mfr. Part No. 0216002.MXP
Each (In a Pack of 10)
MYR5.475
Mersen 125A NH Fuse, NH 00, 500V ac
  • RS Stock No. 270-3153
  • Mfr. Part No. Z232506
Each
MYR66.66
Siemens Sentron Undervoltage Release for use with 3VA1 Series Circuit Breaker
  • RS Stock No. 874-4525
  • Mfr. Part No. 3VA9908-0BB25
Each
MYR781.18
ABB DDA202 RCD, 63A, 2 Pole, 30mA
  • RS Stock No. 231-9888
  • Mfr. Part No. 2CSB202001R1630 DDA202 AC-63/0.03
Each
MYR963.06
RS PRO 6.3A T Ceramic Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 247-4059
Each (In a Pack of 10)
MYR5.079
Better World
Schneider Electric, PowerPact MCCB Molded Case Circuit Breaker 3P 50A
  • RS Stock No. 221-0896
  • Mfr. Part No. BDL36050LU
Each
MYR3,280.52
Eaton Bussmann Series PC Board Non Resettable Fuse, Radial 500mA, 250V ac
  • RS Stock No. 169-9504
  • Mfr. Part No. SR-5-500MA-BK
Each (In a Bag of 200)
MYR6.128
ABB System Pro M Compact S200M MCB, 4P, 8A Curve K, 400V AC, 125V DC, 15 kA Breaking Capacity
  • RS Stock No. 201-251
  • Mfr. Part No. 2CDS274001R0407
Each
MYR3,262.42
Better World
Schneider Electric Multi 9 MCB, 4P, 40A, 1.5 kA Breaking Capacity
  • RS Stock No. 219-9173
  • Mfr. Part No. M9R81440
Each
MYR2,490.36
Siemens SENTRON Terminal Cover for use with 3VA20/21/22
  • RS Stock No. 159-471
  • Mfr. Part No. 3VA9163-0KB04
Each
MYR223.13
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 40A, Breaking Capacity 10 kA, Cable Mount, Panel Mount
  • RS Stock No. 148-397
  • Mfr. Part No. 3VA5140-6EF31-0AA0
Each
MYR2,569.11
Eaton 630A British Standard Fuse, FMM, 690V ac, 85mm
  • RS Stock No. 182-1423
  • Mfr. Part No. 630FMM
Each
MYR847.33
Eaton 16A Panel Mount Fuse Holder for 5 x 20mm Fuse, 1P, 250V ac
  • RS Stock No. 852-6923
  • Mfr. Part No. HTB-34M-R
Each
MYR52.77
Eaton xPole PXL, S200 MCB, 2P, 10A Curve C, 400V AC, 48V DC, 10 kA Breaking Capacity
  • RS Stock No. 490-084
  • Mfr. Part No. 236285 PXL-C10/2
Each
MYR317.49
Better World
Siemens Sentron 5SY4 MCB, 2P, 16A Curve D, 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 772-1313
  • Mfr. Part No. 5SY4216-8
Each
MYR473.01
Phoenix Contact Thermal Circuit Breaker - TCP 0.5A Single Pole 65 V dc, 250V ac Voltage Rating, 500mA Current Rating
  • RS Stock No. 170-3785
  • Mfr. Part No. 0712152
Each (In a Box of 20)
MYR80.22
RS PRO MCB, 3P, 16A Curve C, 240 → 415V AC, 10 kA Breaking Capacity
  • RS Stock No. 265-0206
Each
MYR163.06
Siemens 50A Centred Tag Fuse, NH000, 690V ac
  • RS Stock No. 396-291
  • Mfr. Part No. 3NE1817-0
Each (In a Pack of 3)
MYR499.273
Better World
Schneider Electric Surge Protector, 20kA, DIN Rail Mount
  • RS Stock No. 776-3893
  • Mfr. Part No. A9L16292
Each
MYR3,169.21
ABB S803S MCB, 3P, 32A, KM, 690V AC, 50 kA Breaking Capacity
  • RS Stock No. 140-563
  • Mfr. Part No. 2CCS863001R0536
Each
MYR1,599.02
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