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

132 / 999+
Temporarily out of stock
Better World
Siemens Sentron 5SY4 MCB, 1+N, 20A Curve D, 230V AC, 10 kA Breaking Capacity
  • RS Stock No. 772-1451
  • Mfr. Part No. 5SY4520-8
Each
MYR420.16
In Stock
ABB, Formula DSA MCCB 1P 125A, Fixed Mount
  • RS Stock No. 237-6137
  • Mfr. Part No. 1SDA066687R1
Each
MYR775.72
In Stock
Better World
ABB System Pro M Compact S200 MCB, 3P, 32A Curve D, 440V AC, 6 kA Breaking Capacity
  • RS Stock No. 527-9633
  • Mfr. Part No. 2CDS253001R0321 S203-D32
Each
MYR417.54
In Stock
Better World
Schneider Electric Linergy Busbar, 690V, 64mm Pitch
  • RS Stock No. 212-0182
  • Mfr. Part No. GV3G364
Each
MYR264.25
In Stock
Siemens 100A NH Fuse, NH00, 500V ac
  • RS Stock No. 396-095
  • Mfr. Part No. 3NA3830-7
Each (In a Pack of 3)
MYR45.403
Temporarily out of stock
Eaton 50A F Melamine Cartridge Fuse, 21 x 40mm
  • RS Stock No. 848-4106
  • Mfr. Part No. JJS-50
Each
MYR329.63
Temporarily out of stock
Better World
ABB, XT2L MCCB 4P 63A, Fixed Mount
  • RS Stock No. 236-6504
  • Mfr. Part No. 1SDA067961R1 XT2L 160 Ekip LSI 63A FF
Each
MYR8,492.01
Limited stock
Legrand DX Range DX3 MCB, 1P, 16A Curve C, 250V AC, 12V DC, 4.5 kA Breaking Capacity
  • RS Stock No. 823-4683
  • Mfr. Part No. 4 068 83
Each
MYR165.07
In Stock
RS PRO 20A Slow-Blow Ceramic Cartridge Fuse, 6.35 x 32mm
  • RS Stock No. 180-075
1 Pack of 10
MYR118.01
Temporarily out of stock
RS PRO 3.15A T Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 177-8065
1 Box of 1000
MYR676.82
Temporarily out of stock
Better World
Schneider Electric Busbar Tap-Off Unit with Fuse Isolator, Canalis KN Series
  • RS Stock No. 211-0428
  • Mfr. Part No. KNB50SD4
Each
MYR1,167.99
In Stock
RS PRO 1A T Ceramic Cartridge Fuse, 5 x 20mm
  • RS Stock No. 563-605
Each (In a Pack of 10)
MYR1.642
Temporarily out of stock
ABB MCCB Molded Case Circuit Breaker 4P 80A, Fixed Mount
  • RS Stock No. 250-4209
  • Mfr. Part No. 1SDA054499R1
Each
MYR11,497.38
In Stock
Better World
Schneider Electric Acti 9 iC60H MCB, 2P, 40A Curve B, 440V AC, 100 → 133V DC, 10 kA Breaking Capacity
  • RS Stock No. 791-3203
  • Mfr. Part No. A9F53240
Each
MYR649.97
In Stock
RS PRO 100mA F Ceramic Cartridge Fuse, 5 x 20mm
  • RS Stock No. 240-8283
Each (In a Pack of 10)
MYR3.741
In Stock
Better World
ABB, XT4S MCCB 3P 80A, Fixed Mount
  • RS Stock No. 236-6744
  • Mfr. Part No. 1SDA068436R1 XT4S 160 MA 80 FF
Each
MYR3,165.08
Temporarily out of stock
Schneider Electric Multi9 M9F1 MCB, 3P, 25A Curve D, 440V AC, 125V DC, 6 kA Breaking Capacity
  • RS Stock No. 212-131
  • Mfr. Part No. M9F12325
Each
MYR1,124.22
Temporarily out of stock
Eaton Electronic Circuit breaker
  • RS Stock No. 774-0162
  • Mfr. Part No. 121725 PKE-XTU-12
Each
MYR912.12
Temporarily out of stock
Eaton 63A British Standard Fuse, A4, 500V ac, 94mm
  • RS Stock No. 415-323
  • Mfr. Part No. CEO63
Each
MYR72.99
Temporarily out of stock
ABB 4 Phase Industrial Surge Protector, 100kA, 1.5kV, DIN Rail Mount
  • RS Stock No. 237-6638
  • Mfr. Part No. 2CTB802346R2900
Each
MYR3,580.50
1
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