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

50957 Products showing for Fuses & Circuit Breakers

114 of 999+
Better World
Siemens RCBO, 4A Current Rating, 1P+N Poles, 30mA Trip Sensitivity, Type C, SENTRON Range
  • RS Stock No. 187-3285
  • Mfr. Part No. 5SV1316-7KK04
Each
£140.63
Schurter 6.3A F Ceramic Cartridge Fuse, 5 x 20mm
  • RS Stock No. 167-7954
  • Mfr. Part No. 0001.1012
Each (In a Pack of 10)
£0.51
Phoenix Contact Surge Protector, 250V ac, DIN Rail Mount
  • RS Stock No. 801-6211
  • Mfr. Part No. 2950048
Each
£15.03
Schurter 10A PCB Mount Fuse Holder for 6.3 x 32mm Fuse, 250V ac
  • RS Stock No. 866-4719
  • Mfr. Part No. 0031.3581
Each (In a Pack of 10)
£3.402
TE Connectivity Thermal Circuit Breaker - W31 Single Pole 50 V dc, 240V ac Voltage Rating, 20A Current Rating
  • RS Stock No. 782-0937
  • Mfr. Part No. W31-X2M1G-20
Each
£38.22
Mersen 2A Slow-Blow Ceramic Cartridge Fuse, 10 x 38mm
  • RS Stock No. 247-2897
  • Mfr. Part No. S302788
1 Box of 10
£75.58
Eaton 32A British Standard Fuse, A2, 500V, 73.5mm
  • RS Stock No. 156-8608
  • Mfr. Part No. AAO32M50
Each (In a Pack of 5)
£5.936
Better World
Schneider Electric TeSys GV5P MCB, 3P, 220A, 690V AC, 36 kA Breaking Capacity
  • RS Stock No. 188-4749
  • Mfr. Part No. GV5P220F
Each
£842.75
Littelfuse 2.5A F Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 541-3079
  • Mfr. Part No. 021702.5MXP
Each (In a Pack of 10)
£0.338
Eaton PXF-A RCCB, 25A, 3+N Pole, 30mA, Type A, 400V ac
  • RS Stock No. 490-197
  • Mfr. Part No. 236772 PXF-25/4/003-A
Each
£59.57
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
£150.64
RS PRO 4A T Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 911-3411
Each (In a Pack of 10)
£0.357
Eaton xEffect MCB, 2P, 6A Curve C, 230 → 400V AC, 6 kA Breaking Capacity
  • RS Stock No. 769-4719
  • Mfr. Part No. 239100 FAZ6-C6/2
Each
£57.20
RS PRO 10A T Ceramic Cartridge Fuse, 5 x 20mm
  • RS Stock No. 177-8099
Each (In a Pack of 5)
£1.856
Schurter 10A F Ceramic Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 269-3879
  • Mfr. Part No. 8020.5078
Each
£0.53
RS PRO 2A T Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 610-9967
Each (In a Pack of 10)
£0.409
Littelfuse 50A Red BF1 Car Fuse, 32V dc
  • RS Stock No. 431-6703
  • Mfr. Part No. 153.5631.5501
Each (In a Pack of 5)
£3.32
Eaton MEMShield MCB, 3P, 40A Curve C, 230V AC, 48V DC, 10 kA Breaking Capacity
  • RS Stock No. 124-3048
  • Mfr. Part No. EMCH340 EMCH340
Each
£111.55
Better World
Schneider Electric RCBO, 10A Current Rating, 1P+N Poles, 10mA Trip Sensitivity, Acti 9 Range
  • RS Stock No. 790-9272
  • Mfr. Part No. A9D10810
Each
£176.61
Bourns 5A Resettable Fuse, 30V
  • RS Stock No. 647-8617
  • Mfr. Part No. MF-R500
Each (In a Pack of 10)
£0.336
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RCBOs Guide
There are many things to consider when choosing the right RCBO. Find out more in our comprehensive RCBOs guide.
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Fuses Guide
Our fuses guide explains what they are, what they are used for, how they work, and the different types available.
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Distribution Boards Guide
Our distribution boards guide explains what they are, their uses and types, and how to connect distribution boards.
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MCBs Guide
What are MCBs and how do they work? Discover all you need to know in our comprehensive guide.
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