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

51028 Products showing for Fuses & Circuit Breakers

589 of 999+
Legrand 125A M Ceramic Cartridge Fuse, 66 x 135mm
  • RS Stock No. 266-3189
  • Mfr. Part No. 0 170 50
1 Box of 3
£133.86
Better World
ABB System Pro M Compact S200 MCB, 1P, 10A Curve K, 253V AC, 72V DC, 6 kA Breaking Capacity
  • RS Stock No. 514-0131
  • Mfr. Part No. 2CDS251001R0427 S201-K10
Each
£22.56
Better World
Siemens, Sentron MCCB Molded Case Circuit Breaker 3P 40A, Breaking Capacity 2.5 kA
  • RS Stock No. 245-524
  • Mfr. Part No. 3VA6140-7KT31-0AA0
Each
£1,288.11
Phoenix Contact Surge Protector, 8kA, 700V (Volts), DIN Rail Mount
  • RS Stock No. 267-1813
  • Mfr. Part No. 1334595
Each
£185.80
Siemens, SENTRON MCCB Molded Case Circuit Breaker 1P 40A, Breaking Capacity 5 kA, Cable Mount, Panel Mount
  • RS Stock No. 148-615
  • Mfr. Part No. 3VA5140-4ED11-0AA0
Each
£106.09
ABB S801 Circuit Breaker, 1P, 16A Curve C, 400V AC, 125V DC, 15 kA Breaking Capacity
  • RS Stock No. 287-6379
  • Mfr. Part No. 2CCS861001R0164
Each
£61.08
Eaton 125A NH Fuse, 63 x 40 x 135mm, 690V ac
  • RS Stock No. 244-286
  • Mfr. Part No. 125NHM1B-690
1 Pack of 3
£45.63
WAGO Electronic Circuit Breaker 8A 24V 787, 1 channels , DIN Rail
  • RS Stock No. 303-347
  • Mfr. Part No. 787-3861/108-020
Each
£31.36
1-pole circuit breaker, 8A
  • RS Stock No. 577-476
  • Mfr. Part No. 1658-G21-02-P10-8A
Each
£4.33
SIBA 20A Ceramic Cartridge Fuse, 22 x 58mm
  • RS Stock No. 893-8506
  • Mfr. Part No. 50-140-06/20A
Each
£20.24
ABB System Pro M Compact S200M MCB, 4P, 25A Curve K, 400V AC, 125V DC, 15 kA Breaking Capacity
  • RS Stock No. 204-409
  • Mfr. Part No. 2CDS274001R0517
Each
£161.16
Bulgin 10A Inline Fuse Holder for 5 x 20mm Fuse, 250V ac
  • RS Stock No. 204-8118
  • Mfr. Part No. FX0380/BK
Each (In a Box of 300)
£4.044
Better World
Siemens Sentron 5SY4 MCB, 1P, 40A Curve B, 230V AC, 10 kA Breaking Capacity
  • RS Stock No. 124-3152
  • Mfr. Part No. 5SY4140-6
Each
£20.68
Littelfuse SMD Non Resettable Fuse 8A, 125V
  • RS Stock No. 895-1741
  • Mfr. Part No. 0476008.MR
Each (In a Pack of 10)
£1.21
Lovato MCB, 2P, 50A Curve C, 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 188-1667
  • Mfr. Part No. P1MBUL2PC50
Each
£145.96
Lovato MCB, 2P, 40A Curve C, 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 188-1666
  • Mfr. Part No. P1MBUL2PC40
Each
£145.96
nVent ERICO Neutral Busbar Busbar
  • RS Stock No. 646-805
  • Mfr. Part No. 568678
Each
£9.33
Lovato MCB, 2P, 25A Curve C, 400V AC, 125V DC, 10 kA Breaking Capacity
  • RS Stock No. 188-1650
  • Mfr. Part No. P1MBUH2PC25
Each
£103.50
Eaton 32A Bolted Tag Fuse, F1, 440V ac
  • RS Stock No. 181-8485
  • Mfr. Part No. NS32BS
1 Box of 20
£162.24
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 70A, Breaking Capacity 65 kA, Fixed Mount
  • RS Stock No. 269-538
  • Mfr. Part No. 3VA5270-6EF41-0AA0
Each
£825.93
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