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

281 / 999+
In Stock
Siemens SENTRON 5SM2xxx RCCB, 63A, 4 Pole, 300mA, Type A, 400V ac
  • RS Stock No. 241-4433
  • Mfr. Part No. 5SM2645-8
Each
MYR1,421.56
In Stock
HENSEL 1, 3 Phase Distribution Board, 6 Way, 63 A
  • RS Stock No. 183-2855
  • Mfr. Part No. KV7106
Each
MYR335.22
Temporarily out of stock
Better World
Siemens SENTRON Electronic Circuit Breaker 160A 3VA2, 3 channels
  • RS Stock No. 157-163
  • Mfr. Part No. 3VA2216-7KQ32-0AA0
Each
MYR16,573.92
Temporarily out of stock
ABB SU200 M MCB, 3P, 30A, Type Z, 400V AC, 15 kA Breaking Capacity
  • RS Stock No. 200-672
  • Mfr. Part No. 2CDS273337R0528
Each
MYR2,397.53
Last RS stock
RS PRO 63A Bolted Tag Fuse, 350 V dc, 690V ac, 63.5mm
  • RS Stock No. 221-3665
Each
MYR67.63
In Stock
Phoenix Contact Electronic Circuit Breaker 8A 12 → 24V, 1 channels , Plug-On
  • RS Stock No. 269-8046
  • Mfr. Part No. 1157279
Each
MYR279.52
Temporarily out of stock
Better World
Siemens SENTRON Electronic Circuit Breaker 400A 3VA2, 4 channels
  • RS Stock No. 156-626
  • Mfr. Part No. 3VA2440-8JP42-0AA0
Each
MYR30,430.80
Temporarily out of stock
Eaton xEffect - FRCmM RCCB, 25A, 2 Pole, 300mA, Type A, 110V
  • RS Stock No. 127-424
  • Mfr. Part No. 180606 FRCMM-25/2/03-A-110
Each
MYR786.75
In Stock
Mersen 100A Bolted Tag Fuse, B1C, 240 V dc, 415V ac, 111mm
  • RS Stock No. 178-1058
  • Mfr. Part No. Z1045303 / BTC42V100
Each (In a Pack of 10)
MYR111.728
Temporarily out of stock
Eaton Eaton Moeller NZM Assembly Kit for use with N(S)4(-4), NZM4(-4), PN4(-4)
  • RS Stock No. 229-776
  • Mfr. Part No. 119002 NZM4-XHB-DA
Each
MYR2,851.70
Temporarily out of stock
Siemens SENTRON Trip Unit
  • RS Stock No. 277-0954
  • Mfr. Part No. 3WA9111-0EM61
Each
MYR1,724.88
Temporarily out of stock
Schneider Electric RCBO, 32A Current Rating, 1P+N Poles, 30mA Trip Sensitivity, Type B, Easy9 Range
  • RS Stock No. 654-754
  • Mfr. Part No. EZ9TDA7632
Each
MYR1,155.48
Temporarily out of stock
HENSEL ENYBOARD Distribution Board, 41 A
  • RS Stock No. 117-637
  • Mfr. Part No. RK 0614 T
Each
MYR343.30
In Stock
RS PRO 63A NH Fuse, NH000, 415V ac
  • RS Stock No. 221-3678
Each (In a Pack of 3)
MYR74.043
In Stock
Eaton 2A Bolted Tag Fuse, A2, 550V ac, 73mm
  • RS Stock No. 181-8864
  • Mfr. Part No. AAO2
Each
MYR22.45
Temporarily out of stock
Siemens 20A Cartridge Fuse, 8 x 32mm
  • RS Stock No. 232-2054
  • Mfr. Part No. 3NW6307-1
Each (In a Pack of 10)
MYR26.113
In Stock
Mersen 10A Offset Tag Fuse, 9.4 x 47mm
  • RS Stock No. 209-6420
  • Mfr. Part No. G1065688 / BLST24V10
Each (In a Pack of 10)
MYR14.504
Temporarily out of stock
Schneider Electric, ComPacT New Generation MCCB 4P 160A
  • RS Stock No. 245-046
  • Mfr. Part No. LV429491
Each
MYR8,531.39
Temporarily out of stock
ABB SU200 M MCB, 4P, 50A, Type Z, 240V AC, 15 kA Breaking Capacity
  • RS Stock No. 200-710
  • Mfr. Part No. 2CDS274337R0578
Each
MYR4,546.60
Temporarily out of stock
Better World
Siemens, Sentron MCCB Molded Case Circuit Breaker 3P 100A, Breaking Capacity 3 kA
  • RS Stock No. 245-248
  • Mfr. Part No. 3VA6210-7KQ31-2AA0
Each
MYR21,129.70
1
281
2329
Results per page

Related links