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

51057 Products showing for Fuses & Circuit Breakers

623 of 999+
Better World
ABB, Tmax XT MCCB 4P 40A, Fixed Mount
  • RS Stock No. 236-6821
  • Mfr. Part No. 1SDA068571R1 XT4L 160 Ekip LS/I 40A FF
Each
£1,341.43
Eaton, Eaton Moeller series NZM MCCB Molded Case Circuit Breaker 3P 125A, Breaking Capacity 7.5 kA, Plug In
  • RS Stock No. 230-877
  • Mfr. Part No. 113243 NZMN2-A125-SVE
Each
£881.80
Better World
Schneider Electric, PowerLogic, 630A, Energy Sensor, 3.7W, Wireless
  • RS Stock No. 201-1457
  • Mfr. Part No. LV434022
Each
£1,118.29
Phoenix Contact Surge Protector, 19 inch Rack Mount
  • RS Stock No. 131-421
  • Mfr. Part No. 2838791
Each
£2,615.72
Schneider Electric ComPacT Control Unit for use with Compact NS630b to NS3200
  • RS Stock No. 341-234
  • Mfr. Part No. C7AFM
Each
£2,093.42
Schneider Electric, ComPacT MCCB 4P 250A, Fixed Mount
  • RS Stock No. 260-7894
  • Mfr. Part No. C25F44V250
Each
£3,884.69
Better World
Siemens RCBO, 16A Current Rating, 2P Poles, 300mA Trip Sensitivity, Sentron Range
  • RS Stock No. 225-8783
  • Mfr. Part No. 5SU1654-7KK16
Each
£135.55
SIB Copper Earth Bar L. 110mm x W. 125mm x H. 25mm
  • RS Stock No. 270-5243
  • Mfr. Part No. P04390
1 Bag of 10
£62.83
Eaton RCBO, 10kA Current Rating, 2P Poles, Type C, AFDD Range
  • RS Stock No. 261-352
  • Mfr. Part No. MB-300188 AFDD-6/2/C/001-G/A
Each
£203.23
Better World
Siemens SENTRON 5SY8 MCB, 2P, 10A Curve C, 400V AC, 72V DC, 25 kA Breaking Capacity
  • RS Stock No. 209-6057
  • Mfr. Part No. 5SY8210-7
Each
£88.38
Littelfuse PC Board Non Resettable Fuse, Axial 250mA, 250V ac
  • RS Stock No. 895-1583P
  • Mfr. Part No. 0263.250MXL
Each (Supplied in a Bag)
£2.302
Eaton, Eaton Moeller series NZM MCCB Molded Case Circuit Breaker 3P 400A, Breaking Capacity 9 kA, Plug In
  • RS Stock No. 231-922
  • Mfr. Part No. 111731 NZMH3-VE400-BT
Each
£2,670.92
ABB S800S MCB, 1P, 20A Curve K, 240V AC, 50 kA Breaking Capacity
  • RS Stock No. 140-373
  • Mfr. Part No. 2CCS861001R0487
Each
£67.41
ABB RCBO, 13A Current Rating, 2P Poles, Type B
  • RS Stock No. 237-3381
  • Mfr. Part No. 2CSR252001R1135
Each
£184.49
RS PRO 100A Bolted Tag Fuse, 350 V dc, 690V ac, 63.5mm
  • RS Stock No. 221-3646
1 Bag of 10
£184.64
ABB RCBO, 13A Current Rating, 4P Poles, Type B
  • RS Stock No. 237-5193
  • Mfr. Part No. 2CSR274001R1135
Each
£305.87
Sensata Airpax Airpax Thermal Circuit Breaker - R11 Single Pole Panel Mount, 10A Current Rating
  • RS Stock No. 275-0450
  • Mfr. Part No. R11-2-10.0A-B06CV-V
Each
£13.55
Siemens Single Phase Industrial Surge Protection, 2A, 230V (Volts), DIN Rail Mount
  • RS Stock No. 266-9578
  • Mfr. Part No. 5SY1702-4
Each
£27.24
Eaton 3.15A T Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 169-9417
  • Mfr. Part No. S506-3.15-R
1 Bag of 1000
£150.45
Siemens, SENTRON MCCB 3P 80A, Breaking Capacity 5 kA, Fixed Mount
  • RS Stock No. 147-703
  • Mfr. Part No. 3VA5180-4ED31-0AA0
Each
£228.08
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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
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