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

186 / 999+
Siemens SENTRON 5SJ4111 MCB, 1P, 5A Curve D, 400V AC, 60V DC, 10 kA Breaking Capacity
  • RS Stock No. 300-099
  • Mfr. Part No. 5SJ4111-8HG42
Each
MYR421.48
SENTRON for use with 3VA51 Series
  • RS Stock No. 263-546
  • Mfr. Part No. 3VA9138-0DK72
Each
MYR1,863.11
Schneider Electric Acti9 Acti9 Reflex MCB, 4P, 25A Curve D, 230V AC, 24V DC, 10 KA Breaking Capacity
  • RS Stock No. 205-373
  • Mfr. Part No. A9C63425
Each
MYR9,193.06
Schneider Electric Acti9 Acti9 Reflex MCB, 3P, 25A Curve C, 230V AC, 24V DC, 10 KA Breaking Capacity
  • RS Stock No. 205-295
  • Mfr. Part No. A9C62325
Each
MYR5,762.19
Schneider Electric Acti9 Acti9 Reflex MCB, 3P, 40A Curve C, 230V AC, 24V DC, 10 KA Breaking Capacity
  • RS Stock No. 205-372
  • Mfr. Part No. A9C62340
Each
MYR6,560.68
Schneider Electric Acti9 Acti9 Reflex MCB, 3P, 16A Curve D, 230V AC, 24V DC, 10 KA Breaking Capacity
  • RS Stock No. 205-297
  • Mfr. Part No. A9C63316
Each
MYR6,576.28
Schneider Electric Acti9 Acti9 Reflex MCB, 2P, 16A Curve D, 230V AC, 48V DC, 30 kA Breaking Capacity
  • RS Stock No. 341-103
  • Mfr. Part No. A9C66216
Each
MYR6,136.52
Schneider Electric Acti9 Acti9 Reflex MCB, 3P, 16A Curve C, 230V AC, 24 And 48V DC, 30 kA Breaking Capacity
  • RS Stock No. 130-874
  • Mfr. Part No. A9C65316
Each
MYR3,603.18
Schneider Electric Acti9 Acti9 Reflex MCB, 2P, 16A Curve B, 230V AC, 48V DC, 10 kA Breaking Capacity
  • RS Stock No. 340-980
  • Mfr. Part No. A9C61216
Each
MYR1,581.20
Schneider Electric ComPacT New Generation Trip Unit for use with ComPacT NSX 250 Circuit Breakers
  • RS Stock No. 212-033
  • Mfr. Part No. C2544A250
Each
MYR15,929.80
Better World
ABB Emax2 Electronic Circuit Breaker 1.25kA Ekip Touch LI, 3 channels
  • RS Stock No. 259-3007
  • Mfr. Part No. 1SDA070844R1
Each
MYR27,549.90
315A NH Fuse, 51 x 21 x 79mm, 500V ac
  • RS Stock No. 262-189
  • Mfr. Part No. 315NHG2BI
1 Pack of 3
MYR258.10
Schneider Electric Busbar Connector, Canalis Series
  • RS Stock No. 207-294
  • Mfr. Part No. KBB40ED42203W
Each
MYR1,465.68
Schneider Electric, ComPacT MCCB 3P 600A, Fixed Mount
  • RS Stock No. 260-8203
  • Mfr. Part No. C63F3TM600D
Each
MYR19,027.22
Hager NRN MCB, 3P, 25A Curve C, 415V AC, 25 kA Breaking Capacity
  • RS Stock No. 597-946
  • Mfr. Part No. NRN325
Each
MYR1,106.11
Allen Bradley 140G Cover for use with Circuit Breaker
  • RS Stock No. 255-1645
  • Mfr. Part No. 140G-G-TC3H
Each
MYR282.26
ABB RCBO, 25A Current Rating, 4P Poles, Type B
  • RS Stock No. 237-5120
  • Mfr. Part No. 2CSR254101R1255
Each
MYR2,155.39
Hager CDF RCD Switch, 40A, 4 Pole, 30mA, Type F, 230 → 400V
  • RS Stock No. 599-748
  • Mfr. Part No. CDF840F
Each
MYR1,685.11
Better World
Siemens Sentron 5SY4 MCB, 2P, 40A Curve D, 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 124-3168
  • Mfr. Part No. 5SY4240-8
Each
MYR506.22
Siemens Sentron Busbar
  • RS Stock No. 209-7100
  • Mfr. Part No. 8US1941-2AA01
Each (In a Pack of 6)
MYR116.75
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