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

50687 Products showing for Fuses & Circuit Breakers

50 of 999+
In Stock
Siemens 80A Slotted Tag Fuse, NH000, 690V
  • RS stock no. 230-3018
  • Mfr. Part No. 3NE8720-1
Each (In a Pack of 10)
R 935.191(exc. VAT)
In Stock
Siemens 63A Bottle Fuse Holder, 3P, 400V ac
  • RS stock no. 622-0733
  • Mfr. Part No. 5SG5701
Each
R 1,085.63(exc. VAT)
In Stock
ETI 50A D02 Neozed Fuse, E18 Thread Size, gG, 400V ac
  • RS stock no. 416-017
  • Mfr. Part No. 2212004
Each (In a Pack of 5)
R 26.948(exc. VAT)
In Stock
Schurter Surface Mount Fuse 1.5A, 32V ac
  • RS stock no. 270-7964
  • Mfr. Part No. 3413.0117.22
Each
R 14.22(exc. VAT)
Temporarily out of stock
Phoenix Contact 3 Phase Surge Protector, 50kA, DIN Rail Mount
  • RS stock no. 201-6809
  • Mfr. Part No. 2905422
Each
R 5,147.00(exc. VAT)
In Stock
Mersen 25A Rail Mount Fuse Holder for 8 x 31mm Fuse, 2P, 400V ac
  • RS stock no. 189-5328
  • Mfr. Part No. Q1062683 / CMC82
Each
R 339.94(exc. VAT)
Temporarily out of stock
ETI 10A D01 Neozed Fuse, E14 Thread Size, gG, 400V ac
  • RS stock no. 415-963
  • Mfr. Part No. 2211004
Each (In a Pack of 5)
R 16.962(exc. VAT)
In Stock
Bourns 63A Tag Fuse, 66mm, 500/600V ac, 24.1mm
  • RS stock no. 254-4161
  • Mfr. Part No. PF-GT3-63
Each
R 414.25(exc. VAT)
Temporarily out of stock
HENSEL ENYSTAR Distribution Board, 125 A
  • RS stock no. 117-315
  • Mfr. Part No. FP 1100
Each
R 6,623.72(exc. VAT)
Temporarily out of stock
Eaton 100A Stud Mount Bolt Down Fuse Block, 600V
  • RS stock no. 852-7562
  • Mfr. Part No. 1BS101
Each
R 2,992.73(exc. VAT)
Temporarily out of stock
ABB Motor Operator, For Use With XT2, XT4 Circuit Breaker
  • RS stock no. 192-0893
  • Mfr. Part No. 1SDA066466R1
Each
R 15,819.77(exc. VAT)
In Stock
Phoenix Contact 3 Phase Surge Protector, 65kA, 1200V (Volts), DIN Rail Mount
  • RS stock no. 131-483
  • Mfr. Part No. 2910359
Each
R 8,704.97(exc. VAT)
Temporarily out of stock
Siemens, SENTRON MCCB 4P 1.25kA, Breaking Capacity 35 kA, Fixed Mount
  • RS stock no. 270-4906
  • Mfr. Part No. 3VA2612-7KQ42-0AA0
Each
R 156,721.91(exc. VAT)
In Stock
Siemens SENTRON Door Feedthrough Accessory for use with 3KE42, 3KE43, 3KE44, 3KE45, Operating shafts 12 x 12 mm
  • RS stock no. 266-671
  • Mfr. Part No. 8UC7324-3BB44
Each
R 3,237.61(exc. VAT)
Temporarily out of stock
Siemens 350A Tag Fuse, 141mm, 500V, 109mm
  • RS stock no. 608-786
  • Mfr. Part No. 3NC2431-3C
1 Pack of 3
R 11,168.13(exc. VAT)
Temporarily out of stock
Siemens 500A German Standard Fuse, NH2, 1kV
  • RS stock no. 210-6973
  • Mfr. Part No. 3NE3334-0B
Each (In a Pack of 3)
R 5,017.007(exc. VAT)
In Stock
Siemens 80A Centred Tag Fuse, NH00, 400V
  • RS stock no. 230-2965
  • Mfr. Part No. 3NA6824-4KK
Each (In a Pack of 3)
R 221.53(exc. VAT)
Temporarily out of stock
Siemens 125A Centred Tag Fuse, NH00, 690V ac
  • RS stock no. 396-386
  • Mfr. Part No. 3NE1022-0
Each (In a Pack of 3)
R 1,694.82(exc. VAT)
Temporarily out of stock
Siemens 5SM26 RCCB, 40A, 2 Pole, 300mA, Type AC, 230V
  • RS stock no. 328-416
  • Mfr. Part No. 5SM2623-2
Each
R 4,766.90(exc. VAT)
In Stock
Siemens 50A DIII Diazed Fuse, E33 Thread Size, gR, 500V
  • RS stock no. 203-3972
  • Mfr. Part No. 5SD460
Each (In a Pack of 5)
R 348.06(exc. VAT)
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