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

24 of 999+
Temporarily out of stock
Littelfuse PC Board Non Resettable Fuse, Radial 50mA, 125V ac/dc
  • RS stock no. 878-3233
  • Mfr. Part No. 0273.050H
Each
R 142.13(exc. VAT)
In Stock
Better World
Siemens Sentron 5SY6 MCB, 2P, 6A Curve C, 400V AC, 72V DC, 6 kA Breaking Capacity
  • RS stock no. 196-3628
  • Mfr. Part No. 5SY6206-7
Each
R 1,188.07(exc. VAT)
In Stock
Eaton Surge Arrester, 100kA, On Base Element Mount
  • RS stock no. 250-9826
  • Mfr. Part No. 195238 SPRT12-350/NPE
Each
R 7,257.52(exc. VAT)
In Stock
Siemens SENTRON 5SP4 MCB, 3P, 100A Curve D
  • RS stock no. 216-4054
  • Mfr. Part No. 5SP4391-8
Each
R 6,750.29(exc. VAT)
In Stock
Better World
Schneider Electric RCBO, 20A Current Rating, 1P+N Poles, 30mA Trip Sensitivity, Type B, Acti 9 Range
  • RS stock no. 790-9213
  • Mfr. Part No. A9D31820
Each
R 3,809.60(exc. VAT)
In Stock
Better World
Schneider Electric Multi 9 C60SP MCB, 1P, 2A Curve C, 240 → 415V AC, 60V DC, 10 kA Breaking Capacity
  • RS stock no. 219-9114
  • Mfr. Part No. M9F22102
Each
R 713.27(exc. VAT)
Being discontinued
RS PRO 630mA T Glass Cartridge Fuse, 5 x 20mm
  • RS stock no. 563-637
Each (In a Pack of 10)
R 6.811(exc. VAT)
In Stock
Littelfuse 50A Grey, White Fuse Strips Car Fuse, 80V dc
  • RS stock no. 226-0844
  • Mfr. Part No. 157.5701.5501
Each
R 183.13(exc. VAT)
In Stock
Better World
Schneider Electric RCBO, 20A Current Rating, 1P Poles, 30mA Trip Sensitivity, Acti9 Range
  • RS stock no. 201-2237
  • Mfr. Part No. A9DC3620
Each
R 4,952.37(exc. VAT)
In Stock
3M 20A Inline Fuse Holder for 19mm Fuse, 32V
  • RS stock no. 237-2879
  • Mfr. Part No. 7000006228
Each (In a Pack of 5)
R 10.192(exc. VAT)
In Stock
Eaton 63A Bolted Tag Fuse, 250 V dc, 500V ac, 111mm
  • RS stock no. 181-8706
  • Mfr. Part No. BD63
Each
R 294.88(exc. VAT)
In Stock
Schneider Electric Acti 9 Bell Transformer for use with Canalis
  • RS stock no. 247-1920
  • Mfr. Part No. A9A15216
Each
R 1,765.49(exc. VAT)
In Stock
Littelfuse 10A T Glass Cartridge Fuse, 5 x 20mm
  • RS stock no. 541-4533
  • Mfr. Part No. 0218010.MXP
Each (In a Pack of 10)
R 32.827(exc. VAT)
In Stock
Siemens SIRIUS 3 Phase Busbar
  • RS stock no. 755-2955
  • Mfr. Part No. 3RV2917-4A
Each
R 351.34(exc. VAT)
In Stock
TE Connectivity Thermal Circuit Breaker - W58 Single Pole 50 V dc, 250V ac Voltage Rating, 8A Current Rating
  • RS stock no. 782-8041
  • Mfr. Part No. W58-XB1A4A-8
Each
R 171.43(exc. VAT)
Temporarily out of stock
Eaton Single Phase Surge Protector, 40kA, 1.8kV, DIN Rail Mount
  • RS stock no. 121-149
  • Mfr. Part No. 167623 SPCT2-385-1+NPE
Each
R 2,905.57(exc. VAT)
Temporarily out of stock
Siemens SENTRON 3 Phase Busbar Connector, 400V
  • RS stock no. 152-507
  • Mfr. Part No. 5ST3613-4
Each
R 378.50(exc. VAT)
In Stock
Eaton xEffect MCB, 1P, 6A Curve C, 230V AC, 60V DC, 10 kA Breaking Capacity
  • RS stock no. 624-0349
  • Mfr. Part No. 278555 FAZ-C6/1
Each
R 640.28(exc. VAT)
In Stock
Eaton 32A Rail Mount Fuse Holder for A2 Fuse, 1P, 690V ac
  • RS stock no. 413-917
  • Mfr. Part No. RS32H
Each
R 593.22(exc. VAT)
In Stock
Murrelektronik Limited Electronic Circuit Breaker
  • RS stock no. 123-6690
  • Mfr. Part No. 9000-41034-0401000
Each
R 3,939.99(exc. VAT)
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