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

584 of 999+
80A Tag Fuse, 40 x 135mm, 500V
  • RS Stock No. 262-054
  • Mfr. Part No. 80NHG1B NH FUSE 80A 500V gG SIZE 1 DUAL IND
1 Pack of 3
£21.61(exc. VAT)
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 4P 0.001kA, Breaking Capacity 15 kA, Fixed Mount
  • RS Stock No. 253-726
  • Mfr. Part No. 265978 NZMN4-4-VE1000
Each
£6,469.39(exc. VAT)
Siemens 315A NH Fuse, NH2, 500V ac
  • RS Stock No. 395-563
  • Mfr. Part No. 3NA3252
Each (In a Pack of 3)
£14.727(exc. VAT)
RS PRO 6A F Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 177-8039
1 Box of 1000
£242.71(exc. VAT)
Better World
Siemens SENTRON 5SL6 MCB, 3+N, 16A Curve C, 400V AC, 72V DC
  • RS Stock No. 212-8947
  • Mfr. Part No. 5SL6616-7
Each
£105.59(exc. VAT)
Siemens, SENTRON MCCB 3P 110A, Breaking Capacity 18 kA, Fixed Mount
  • RS Stock No. 147-666
  • Mfr. Part No. 3VA5211-5EC31-1AA0
Each
£643.31(exc. VAT)
ABB Shunt Trip Shunt trip for use with S200U, S200UP
  • RS Stock No. 203-766
  • Mfr. Part No. 2CDS200908R0002
Each
£103.59(exc. VAT)
Better World
Siemens, SENTRON MCCB 3P 63A, Breaking Capacity 25 kA
  • RS Stock No. 209-6742
  • Mfr. Part No. 3VA1063-3ED32-0AA0
Each
£153.86(exc. VAT)
Better World
Schneider Electric Power Connection for use with Compact Nsx100/160/250
  • RS Stock No. 221-1168
  • Mfr. Part No. LV429268
Each
£24.23(exc. VAT)
Better World
Siemens SENTRON 5SL4 MCB, 3P, 25A Curve C, 400V AC, 72V DC, 10 kA Breaking Capacity
  • RS Stock No. 209-5975
  • Mfr. Part No. 5SL4325-7
Each
£81.11(exc. VAT)
Better World
Schneider Electric LCD display for use with Acti 9 Smartlink smart communication module, ComPact NS630b...1600, ComPact
  • RS Stock No. 221-1075
  • Mfr. Part No. LV434128
Each
£1,053.63(exc. VAT)
ABB, Tmax MCCB 3P 400A, Fixed Mount
  • RS Stock No. 237-5967
  • Mfr. Part No. 1SDA054445R1 T5H400 FF TMA 400A
Each
£1,270.62(exc. VAT)
Eaton Moeller xPole 3 Phase Busbar, 500V
  • RS Stock No. 253-280
  • Mfr. Part No. 215659 EVG-3PHAS/N/5MODUL/LS
Each
£8.67(exc. VAT)
Siemens 630A Slotted Tag Fuse, NH3, 690V
  • RS Stock No. 230-3005
  • Mfr. Part No. 3NE1436-3
Each (In a Pack of 3)
£417.877(exc. VAT)
Better World
Siemens, SENTRON MCCB 4P 600A, Breaking Capacity 35 kA, Fixed Mount
  • RS Stock No. 249-382
  • Mfr. Part No. 3VA6460-5JP41-0AA0
Each
£2,970.24(exc. VAT)
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 160A, Breaking Capacity 36 kA, DIN Rail Mount
  • RS Stock No. 271-9779
  • Mfr. Part No. 3VA1116-4GE46-0AA0
Each
£577.23(exc. VAT)
Allen Bradley 1492-RCDA RCD, 25A, 1+N Pole, 300mA, Type A
  • RS Stock No. 136-8585
  • Mfr. Part No. 1492-RCDA2C25
Each
£85.65(exc. VAT)
Eaton 100A Rail Mount Fuse Holder for A4 Fuse, 1P, 690V ac
  • RS Stock No. 221-651
  • Mfr. Part No. RS100P
Each
£86.73(exc. VAT)
Siemens 40A Centred Tag Fuse, NH000, 500V ac
  • RS Stock No. 203-2006
  • Mfr. Part No. 3NA7817
Each (In a Pack of 3)
£4.82(exc. VAT)
Siemens ALPHA Cable Connection Kit for use with Cable Entry
  • RS Stock No. 213-2464
  • Mfr. Part No. 8HC6900
Each (In a Pack of 10)
£11.655(exc. VAT)
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