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

51028 Products showing for Fuses & Circuit Breakers

2546 of 999+
Better World
Siemens, Sentron MCCB Molded Case Circuit Breaker 4P 100A, Breaking Capacity 3 kA
  • RS Stock No. 245-279
  • Mfr. Part No. 3VA6210-7HL41-0AA0
Each
£1,674.55
Siemens ALPHA Assembly Kit for use with Devices With Central Direct Operating Mechanism
  • RS Stock No. 628-846
  • Mfr. Part No. 8GK6432-2KK23
Each
£176.55
Mersen 80mA Time Lag Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 630-866
  • Mfr. Part No. E090532Q
1 Box of 10
£10.66
Hager MMN MCB, 4P, 40A, 400V AC, 20 kA Breaking Capacity
  • RS Stock No. 602-138
  • Mfr. Part No. MMN440
Each
£540.94
Hager NSN MCB, 4P, 40A Curve D, 415V AC, 20 kA Breaking Capacity
  • RS Stock No. 597-910
  • Mfr. Part No. NSN440
Each
£410.98
Siemens SENTRON 5SY7 MCB, 4P, 13A Curve D, 400V AC, 60V DC, 25 kA Breaking Capacity
  • RS Stock No. 610-395
  • Mfr. Part No. 5SY7413-8
Each
£201.66
Siemens 63A Tag Fuse, 103mm, 690V, 75.8mm
  • RS Stock No. 608-702
  • Mfr. Part No. 3NC2663-0MK
1 Pack of 3
£73.51
Siemens Siemens Busbar
  • RS Stock No. 627-186
  • Mfr. Part No. 8PQ6000-5BA77
Each
£471.12
Siemens ALPHA Assembly Kit for use with Door Mounted Rotary Operator
  • RS Stock No. 629-303
  • Mfr. Part No. 8GK6432-4KK33
Each
£243.95
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 600A, Breaking Capacity 100 kA, Fixed Mount
  • RS Stock No. 250-030
  • Mfr. Part No. 3VA6560-7JQ36-0AA0
Each
£3,991.47
Mersen 500mA Quick Acting Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 630-812
  • Mfr. Part No. H090512Q
1 Box of 10
£5.86
Schneider Electric Panelset Busbar
  • RS Stock No. 444-411
  • Mfr. Part No. NSYTBCN3128
Each
£2,207.69
HOLDER FOR FK (ATO) 4 FUSE COMBINATION
  • RS Stock No. 522-993
  • Mfr. Part No. 178.6152.0042
1 Pack of 50
£144.97
Hager Hager NEN Circuit Breaker, 1P, 10A Curve B, 230 → 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 599-896
  • Mfr. Part No. NEN110
Each
£45.66
Better World
Siemens, Sentron MCCB Molded Case Circuit Breaker 4P 100A, Breaking Capacity 3 kA
  • RS Stock No. 245-251
  • Mfr. Part No. 3VA6210-7KT41-2AA0
Each
£2,788.39
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 600A, Breaking Capacity 65 kA, Fixed Mount
  • RS Stock No. 250-106
  • Mfr. Part No. 3VA6560-6HM42-2AA0
Each
£4,375.39
Hager CFB RCD Switch, 63A, 4 Pole, 300mA, Type B, 230 → 400V
  • RS Stock No. 599-755
  • Mfr. Part No. CFB763F
Each
£1,362.93
Siemens 125A Cartridge Fuse, 22.2 x 58mm
  • RS Stock No. 627-153
  • Mfr. Part No. 3NC2211-0MK
1 Pack of 10
£165.02
Schneider Electric Tee Elbow Busbar Trunking, 200 → 750mm, 250A, Canalis Series
  • RS Stock No. 346-715
  • Mfr. Part No. KSA250DLC4CFM
Each
£2,086.88
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 600A, Breaking Capacity 100 kA, Fixed Mount
  • RS Stock No. 249-620
  • Mfr. Part No. 3VA6560-7JP46-0AA0
Each
£4,034.60
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