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

47265 Products showing for Fuses & Circuit Breakers

224 of 999+
Temporarily out of stock
Better World
Siemens, 0AA0 MCCB 4P 50A, Breaking Capacity 55 kA, Fixed Mount
  • RS Stock No. 211-6023
  • Mfr. Part No. 3VA1150-5EE42-0AA0
Each
HK$4,340.60
Temporarily out of stock
ABB Tmax XT Changeover Contact for use with Circuit Breaker
  • RS Stock No. 232-0186
  • Mfr. Part No. 1SDA066436R1 AUX-C 3Q+2SY 250V XT2-XT4
Each
HK$1,484.89
Temporarily out of stock
Hager RCBO, 20A Current Rating, 3P Poles, 30mA Trip Sensitivity, Type AC
  • RS Stock No. 251-2013
  • Mfr. Part No. ADC420F
Each
HK$4,795.28
Temporarily out of stock
ABB System Pro M Compact S200 MCB, 4P, 500mA, Type Z, 400V AC, 110V DC, 10 kA Breaking Capacity
  • RS Stock No. 204-269
  • Mfr. Part No. 2CDS254001R0158
Each
HK$3,726.47
Temporarily out of stock
Schneider Electric, ComPacT New Generation MCCB 4P 160A, Breaking Capacity 85 kA, Fixed Mount
  • RS Stock No. 207-154
  • Mfr. Part No. C12F44V160L
Each
HK$18,448.40
Temporarily out of stock
Siemens SENTRON Nut Keeper Kit for use with 3VA1
  • RS Stock No. 269-7192
  • Mfr. Part No. 3VA9404-0QG00
Each (In a Pack of 4)
HK$187.825
In Stock
Littelfuse 0.2A Resettable Fuse, 72V
  • RS Stock No. 517-6584P
  • Mfr. Part No. RXEF020
Each (Supplied in a Bag)
HK$1.82
Temporarily out of stock
Siemens SENTRON 5SY4 MCB, 2P, 3A, Type A, 400V AC, 60V DC, 35 kA Breaking Capacity
  • RS Stock No. 610-309
  • Mfr. Part No. 5SY4203-5
Each
HK$1,169.48
In Stock
TE Connectivity Thermal Circuit Breaker - W31 Single Pole 50 V dc, 240V ac Voltage Rating, 20A Current Rating
  • RS Stock No. 782-0937
  • Mfr. Part No. W31-X2M1G-20
Each
HK$347.50
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 100A, Breaking Capacity 36 kA
  • RS Stock No. 209-6965
  • Mfr. Part No. 3VA1110-4GF46-0AA0
Each
HK$5,786.00
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 125A
  • RS Stock No. 210-1618
  • Mfr. Part No. 3VA1112-1AA46-0AA0
Each
HK$4,979.90
In Stock
Schneider Electric Acti9 A9P MCB, 1P + N, 24A Curve B, 230V AC, 10 kA Breaking Capacity
  • RS Stock No. 654-243
  • Mfr. Part No. A9P44625
Each
HK$655.20
In Stock
Eaton HTC Series Thermoplastic Fuse Cover for 5 x 20mm Fuse
  • RS Stock No. 765-2976
  • Mfr. Part No. HTC-140M
Each (In a Pack of 5)
HK$3.16
In Stock
SIBA 200mA F Ceramic Cartridge Fuse, 5 x 20mm
  • RS Stock No. 783-3208
  • Mfr. Part No. 70-007-33/0.2A
Each (In a Pack of 10)
HK$1.91
Temporarily out of stock
Eaton 4A Resettable Fuse, 6V
  • RS Stock No. 225-8260
  • Mfr. Part No. PTSLR12066V400
Each (In a Pack of 10)
HK$4.30
In Stock
Littelfuse SMD Non Resettable Fuse 2.5A, 125V
  • RS Stock No. 738-2924
  • Mfr. Part No. 045102.5MRL
Each (In a Pack of 10)
HK$8.35
Temporarily out of stock
Better World
Siemens SENTRON for use with 3VA1 and 3VA20 up → 3VA25
  • RS Stock No. 210-9429
  • Mfr. Part No. 3VA9988-0BL32
Each
HK$703.90
Temporarily out of stock
Phoenix Contact Trabtech Thermal Circuit Breaker - CB TM2 2 Pole 80V dc Voltage Rating, 12A Current Rating
  • RS Stock No. 201-6425
  • Mfr. Part No. 2800877
Each
HK$745.60
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 25A, Breaking Capacity 150 kA, Fixed Mount
  • RS Stock No. 270-3710
  • Mfr. Part No. 3VA2025-8JP42-0AA0
Each
HK$17,496.40
In Stock
SIBA 250A White Automotive Car Fuse, 80V dc
  • RS Stock No. 161-1836
  • Mfr. Part No. 9005805.250
Each
HK$59.60
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