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

50686 Products showing for Fuses & Circuit Breakers

25 of 999+
Temporarily out of stock
Littelfuse 250A Panel Mount Fuse Block
  • RS stock no. 878-3946
  • Mfr. Part No. 02980900Z
Each
R 451.18(exc. VAT)
Currently unavailable
Better World
Schneider Electric
  • RS stock no. 178-7882
  • Mfr. Part No. LV426932
Each
R 1,561.07(exc. VAT)
In Stock
Eaton 10A T Melamine Cartridge Fuse, 10 x 38mm
  • RS stock no. 851-1665
  • Mfr. Part No. FNQ-R-10
Each
R 1,229.63(exc. VAT)
In Stock
Littelfuse 20A Panel Mount Fuse Holder for 6.3 x 32mm Fuse, 250V ac
  • RS stock no. 769-0170
  • Mfr. Part No. 03453LF1H
Each
R 108.99(exc. VAT)
In Stock
Mersen 315A NH Fuse, NH2, 400V ac
  • RS stock no. 270-3088
  • Mfr. Part No. N223733
Each
R 911.54(exc. VAT)
In Stock
Littelfuse 250mA F Glass Cartridge Fuse, 5 x 20mm
  • RS stock no. 541-4319
  • Mfr. Part No. 0217.250MXP
Each (In a Pack of 10)
R 22.683(exc. VAT)
In Stock
Europa 3 Phase Distribution Board, 24 Way, 125 A
  • RS stock no. 849-6418
  • Mfr. Part No. TPN08
Each
R 5,583.77(exc. VAT)
In Stock
Siemens SIRIUS 3 Phase Busbar, 690V, 45mm Pitch
  • RS stock no. 246-5128
  • Mfr. Part No. 3RV1915-1AB
Each
R 211.15(exc. VAT)
In Stock
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
R 392.44(exc. VAT)
In Stock
Schneider Electric R9PR RCCB, 63A, 2 Pole, 30mA, Type A, 230V
  • RS stock no. 276-8972
  • Mfr. Part No. R9PRA263
Each
R 1,907.89(exc. VAT)
Temporarily out of stock
Better World
ABB, XT4H MCCB 4P 250A, Fixed Mount
  • RS stock no. 236-6799
  • Mfr. Part No. 1SDA068540R1 XT4H 250 Ekip I 250A FF
Each
R 26,479.67(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)
In Stock
Eaton 315mA T Glass Cartridge Fuse, 5 x 20mm
  • RS stock no. 537-8651
  • Mfr. Part No. S506-315-R
Each (In a Pack of 10)
R 4.449(exc. VAT)
Temporarily out of stock
Littelfuse SMD Non Resettable Fuse 250mA, 125V ac/dc
  • RS stock no. 820-7142
  • Mfr. Part No. 0440.250WR
Each (In a Pack of 100)
R 13.509(exc. VAT)
In Stock
Better World
Schneider Electric Acti 9 iC60N MCB, 3P, 32A Curve C, 100 → 130V AC, 12 → 144V DC, 6 kA Breaking Capacity
  • RS stock no. 734-9166
  • Mfr. Part No. A9F77332
Each
R 1,370.49(exc. VAT)
In Stock
Better World
Schneider Electric Copper
  • RS stock no. 219-8668
  • Mfr. Part No. NSYRBL216146M
Each (In a Pack of 10)
R 233.611(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
Schneider Electric, Acti9, 32A, Energy Sensor, 3.5VA, Wireless
  • RS stock no. 276-8717
  • Mfr. Part No. A9C15907
Each
R 4,427.46(exc. VAT)
In Stock
Littelfuse PC Board Non Resettable Fuse, Radial 50mA, 125V ac
  • RS stock no. 738-3309
  • Mfr. Part No. 39600500000
Each (In a Pack of 10)
R 44.842(exc. VAT)
In Stock
Schurter 800mA F Ceramic Cartridge Fuse, 6.3 x 32mm
  • RS stock no. 269-3872
  • Mfr. Part No. 8020.5067
Each
R 15.26(exc. VAT)
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