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

50957 Products showing for Fuses & Circuit Breakers

692 of 999+
ABB Tmax XT Auxiliary Contact for use with Tamx XT
  • RS Stock No. 236-6882
  • Mfr. Part No. 1SDA104815R1 AUP-I XT5-6 P/W 3 250V
Each
£97.18
Eaton 200A Cartridge Fuse, 22 x 42mm
  • RS Stock No. 182-1445
  • Mfr. Part No. JJS-200
Each
£145.29
Schneider Electric Acti9 Acti9 iC60 MCB, 3P, 63A, 230V AC
  • RS Stock No. 357-455
  • Mfr. Part No. A9V81363
1 Pack of 15
£7,026.33
ABB Tmax XT Trip Unit for use with Tmax XT
  • RS Stock No. 236-7249
  • Mfr. Part No. 1SDA067314R1 Ekip LSIG In=160A XT2 3p
Each
£1,019.65
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 600A, Breaking Capacity 65 kA, Fixed Mount
  • RS Stock No. 249-585
  • Mfr. Part No. 3VA6560-6KQ42-0AA0
Each
£4,190.16
Better World
Schneider Electric Acti 9 A9F9 MCB, 4P, 16A Curve K, 400V AC, 250V DC, 20 kA, 15 kA Breaking Capacity
  • RS Stock No. 211-2513
  • Mfr. Part No. A9F95416
Each
£236.34
Siemens ALPHA Busbar Support for use with ALPHA 1250
  • RS Stock No. 629-085
  • Mfr. Part No. 8GK9720-0KK01
Each
£51.40
Finder Busbar, 6 A - 250V
  • RS Stock No. 776-1538
  • Mfr. Part No. 093.16.0
Each
£3.80
Eaton MCB, 1P, 8A Curve B, 230V AC, 10 kA Breaking Capacity
  • RS Stock No. 240-528
  • Mfr. Part No. 101248 PLI-B8/1
Each
£15.99
Siemens ALPHA Assembly Kit for use with Terminal Block
  • RS Stock No. 629-268
  • Mfr. Part No. 8GK4401-3KK12
Each
£54.04
Schneider Electric Acti9 3 Phase Distribution Board, 22 Way, 250 A
  • RS Stock No. 339-829
  • Mfr. Part No. SEA9BPN25018S4
Each
£4,677.03
Eaton PDIM RCCB, 100A, 4 Pole, 0.03 → 1mA, Type A, 230/400V ac
  • RS Stock No. 231-924
  • Mfr. Part No. 111761 PDIM-100/4
Each
£380.10
Schneider Electric, ComPacT MCCB 4P 100A, Breaking Capacity 10 kA, Fixed Mount
  • RS Stock No. 347-088
  • Mfr. Part No. C10N47E100
Each
£3,793.04
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 3P 40A, Breaking Capacity 15 kA, Fixed Mount
  • RS Stock No. 254-082
  • Mfr. Part No. 259095 NZMH2-A40
Each
£418.37
Schneider Electric, VigiPacT Circuit breaker 3P 100 A, 160 A
  • RS Stock No. 119-256
  • Mfr. Part No. LV429490
Each
£1,154.88
Schneider Electric Compact Guide Frame for use with NS1000
  • RS Stock No. 354-351
  • Mfr. Part No. 33295
Each
£5,430.96
140A Cartridge Fuses
  • RS Stock No. 263-184
  • Mfr. Part No. 7.2BFGHA140
1 Pack of 3
£1,145.55
Siemens SENTRON 5SY4 MCB, 2P, 4A, Type A, 230V AC, 60V DC, 35 kA Breaking Capacity
  • RS Stock No. 610-321
  • Mfr. Part No. 5SY4504-5
Each
£73.16
Better World
ABB, Protecta MCCB 3P 250A, Breaking Capacity 36 kA, DIN Rail Mount
  • RS Stock No. 831-9179
  • Mfr. Part No. 1SDA068058R1 XT3N 250 TMD 200-2000 3p F F
Each
£465.31
Siemens SENTRON Busbar Cover, 690V, 60mm Pitch
  • RS Stock No. 159-365
  • Mfr. Part No. 8US1922-1AC00
Each (In a Pack of 10)
£5.04
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