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
Fuses - PCB
Fuses - PCB

46578 Products showing for Fuses & Circuit Breakers

209 / 999+
In Stock
Eaton 20A British Standard Fuse, F1, 550V ac
  • RS Stock No. 413-513
  • Mfr. Part No. NSD20
Each (In a Pack of 5)
MYR30.884
Unavailable
Schneider Electric ComPact Trip Unit for use with Compact NSX 250 circuit breakers
  • RS Stock No. 221-1007
  • Mfr. Part No. LV431480
Each
MYR7,071.66
Temporarily out of stock
Better World
ABB System Pro M Compact S200M MCB, 2P, 16A Curve D
  • RS Stock No. 231-9725
  • Mfr. Part No. 2CDS272001R0161 S202M D 16A - 15 KA
1 Box of 1
MYR301.50
In Stock
Littelfuse 32mA T Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 725-8057
  • Mfr. Part No. 0218.032MXP
Each (In a Bag of 10)
MYR7.97
In Stock
Better World
Schneider Electric Acti 9 Acti9 iDT40N XA MCB, 3P, 10A Curve C, 400V AC
  • RS Stock No. 238-3430
  • Mfr. Part No. A9PA4310
Each
MYR1,156.98
Temporarily out of stock
Better World
Siemens SENTRON 3VA9 Wire Connector for use with 3VA15/25 1000
  • RS Stock No. 218-1863
  • Mfr. Part No. 3VA9503-0JB32
Each
MYR1,543.02
In Stock
Eaton RCD, 40A, 4 Pole, 30mA, Type A, 230/400V ac
  • RS Stock No. 922-8664
  • Mfr. Part No. 235439 PFIM-40/4/003-A-MW
Each
MYR1,112.46
In Stock
Eaton Moeller Door Coupling Handle for use with PKZM0, PKZM4
  • RS Stock No. 273-6416
  • Mfr. Part No. 106132 PKZ0-XH
Each
MYR387.20
In Stock
Eaton 208 → 250V ac/dc Shunt Trip Shunt trip for use with N(S)1(-4) Series, NZM1(-4) Series
  • RS Stock No. 454-8219
  • Mfr. Part No. 259726 NZM1-XA208-250AC/DC
Each
MYR653.01
In Stock
Better World
Schneider Electric Acti 9 iC60N MCB, 2P, 4A Curve C, 400V AC, 125V DC, 6 kA Breaking Capacity
  • RS Stock No. 734-9220
  • Mfr. Part No. A9F74204
Each
MYR982.07
Temporarily out of stock
Eaton 160A Fuse Holder for NH00, NH000 Fuse, 3P, 440 V ac/dc, 690 V ac/dc
  • RS Stock No. 127-218
  • Mfr. Part No. 183028 XNH00-FCL-A160-BT
Each
MYR648.90
In Stock
ABB SU 200 M Circuit Breaker, 1P, 8A Curve K, 277V AC, 48V DC, 15 kA Breaking Capacity
  • RS Stock No. 287-6391
  • Mfr. Part No. 2CDS271337R0407
Each
MYR252.35
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 2P 45A, Breaking Capacity 14 kA, Cable Mount, Panel Mount
  • RS Stock No. 148-409
  • Mfr. Part No. 3VA5145-4ED21-1AA0
Each
MYR1,868.98
Temporarily out of stock
Siemens, SENTRON MCCB 3P 110A, Breaking Capacity 7 kA, Fixed Mount
  • RS Stock No. 147-419
  • Mfr. Part No. 3VA5211-5ED31-2AA0
Each
MYR6,193.11
In Stock
Eaton 125A Bolted Tag Fuse, 415V ac, 82mm
  • RS Stock No. 181-8890
  • Mfr. Part No. 125MJ30-7
Each
MYR230.53
Temporarily out of stock
Eaton Fuse Holder Trip Indicator Kit
  • RS Stock No. 182-1453
  • Mfr. Part No. EC-600
Each
MYR130.39
Temporarily out of stock
ABB S803N MCB, 3P, 10A Curve C, 690V AC, 36 kA Breaking Capacity
  • RS Stock No. 140-914
  • Mfr. Part No. 2CCS893001R0104
Each
MYR1,211.25
Temporarily out of stock
ABB 160A Tag Fuse, 125 x 40 x 60mm, 500V
  • RS Stock No. 251-3452
  • Mfr. Part No. 1SCA022627R3170
1 Box of 3
MYR217.48
In Stock
Schneider Electric, ComPacT NSX MCCB 4P 160A, Fixed Mount
  • RS Stock No. 254-6346
  • Mfr. Part No. C16F4
Each
MYR3,138.00
In Stock
Legrand 500mA F Ceramic Cartridge Fuse, 5 x 20mm
  • RS Stock No. 180-6103
  • Mfr. Part No. 0 102 05
Each (In a Box of 10)
MYR8.458
1
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