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

43 of 999+
In Stock
Eaton xEffect MCB, 3+N, 6A Curve C
  • RS stock no. 230-0981
  • Mfr. Part No. 239170 FAZ6-C6/3N
Each
R 1,639.28(exc. VAT)
In Stock
Siemens Alpha Blanking Strip
  • RS stock no. 209-7096
  • Mfr. Part No. 8GK9910-0KK01
Each
R 766.28(exc. VAT)
In Stock
RS PRO 25A British Standard Fuse, F1, 550V ac
  • RS stock no. 521-2949
Each (In a Pack of 5)
R 109.608(exc. VAT)
In Stock
ABB, Protecta MCCB 3P 63A, Breaking Capacity 36 kA, DIN Rail Mount
  • RS stock no. 831-9163
  • Mfr. Part No. 1SDA067414R1 XT1N 160 TMD 63-630 3p F F
Each
R 5,831.99(exc. VAT)
In Stock
Better World
ABB, XT3N MCCB 4P 250A, Fixed Mount
  • RS stock no. 236-6581
  • Mfr. Part No. 1SDA068066R1 XT3N 250 TMD 250A 3P+N FF
Each
R 20,466.98(exc. VAT)
Temporarily out of stock
ABB MCCB Molded Case Circuit Breaker 3P 500A, Fixed Mount
  • RS stock no. 250-4190
  • Mfr. Part No. 1SDA054473R1
Each
R 96,380.01(exc. VAT)
Temporarily out of stock
Better World
Siemens SENTRON 5SY7 MCB, 2P, 20A Curve C, 400V AC, 72V DC, 15 kA Breaking Capacity
  • RS stock no. 209-6042
  • Mfr. Part No. 5SY7220-7
Each
R 1,713.89(exc. VAT)
In Stock
Eaton 800mA T Ceramic Cartridge Fuse, 5 x 20mm
  • RS stock no. 171-6759
  • Mfr. Part No. S505H-800-R
Each (In a Pack of 5)
R 11.908(exc. VAT)
Temporarily out of stock
ABB 500A Tag Fuse, NH2, 500V
  • RS stock no. 258-9607
  • Mfr. Part No. 1SCA022701R4610
Each
R 856.14(exc. VAT)
Temporarily out of stock
ABB SMISSLINE TP MCB, 2P, 16A Curve K, 240V AC
  • RS stock no. 246-2543
  • Mfr. Part No. 2CCS571103R8467
Each
R 1,908.89(exc. VAT)
In Stock
Littelfuse 8A T Ceramic Cartridge Fuse, 5 x 20mm
  • RS stock no. 541-4735
  • Mfr. Part No. 0215008.MXP
Each (In a Pack of 10)
R 27.777(exc. VAT)
In Stock
Eaton 2A F Ceramic Cartridge Fuse, 5 x 20mm
  • RS stock no. 537-1436
  • Mfr. Part No. S501-2-R
Each (In a Pack of 10)
R 9.115(exc. VAT)
In Stock
Better World
Schneider Electric 2A Cartridge Fuse, 10 x 38mm
  • RS stock no. 181-2608
  • Mfr. Part No. DF2CA02
Each (In a Box of 10)
R 201.157(exc. VAT)
In Stock
Eaton 50mA F Glass Cartridge Fuse, 5 x 20mm
  • RS stock no. 537-1127
  • Mfr. Part No. S500-50-R
Each (In a Pack of 10)
R 63.394(exc. VAT)
Unavailable
Schneider Electric, ComPact MCCB Molded Case Circuit Breaker 3P 100A, Fixed Mount
  • RS stock no. 221-1077
  • Mfr. Part No. LV438018
Each
R 9,025.42(exc. VAT)
Temporarily out of stock
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 4P 125A, Breaking Capacity 18.5 kA, Fixed Mount
  • RS stock no. 255-598
  • Mfr. Part No. 265809 NZMB1-4-A125
Each
R 19,028.94(exc. VAT)
In Stock
Better World
Schneider Electric TeSys Thermal Circuit Breaker - GV3P 3 Pole 690V ac Voltage Rating DIN Rail Mount, 73A Current Rating
  • RS stock no. 188-4747
  • Mfr. Part No. GV3P73
Each
R 8,308.04(exc. VAT)
Temporarily out of stock
ABB MCCB Molded Case Circuit Breaker 3P+N 500A, Fixed Mount
  • RS stock no. 250-4189
  • Mfr. Part No. 1SDA054471R1
Each
R 107,982.44(exc. VAT)
In Stock
Siemens 10A DII Diazed Fuse, E27 Thread Size, gG, 500V ac
  • RS stock no. 396-308
  • Mfr. Part No. 5SB251
Each (In a Pack of 5)
R 29.608(exc. VAT)
Temporarily out of stock
SIBA 125A NH Fuse, NH00, 690V ac
  • RS stock no. 431-7021
  • Mfr. Part No. 20-209-34/125A
Each
R 1,457.09(exc. VAT)
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