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

236 of 999+
Temporarily out of stock
Siemens 50A Diazed Fuse, gG, 750V ac/dc
  • RS Stock No. 163-278
  • Mfr. Part No. 5SD610
1 Pack of 5
HK$1,175.50
In Stock
Wickmann PC Board Non Resettable Fuse, Radial 5A, 125V ac
  • RS Stock No. 226-0838
  • Mfr. Part No. 3951500000
Each (In a Pack of 10)
HK$9.31
Limited stock
Littelfuse 7A Resettable Fuse, 16V
  • RS Stock No. 517-6950
  • Mfr. Part No. RGEF700
Each (In a Pack of 5)
HK$4.66
Temporarily out of stock
5A Cartridge Fuse, 23 x 57mm
  • RS Stock No. 262-235
  • Mfr. Part No. 5KR85
1 Pack of 20
HK$2,332.70
In Stock
Littelfuse Non-Resettable Surface Mount Fuse 40A, 60V ac
  • RS Stock No. 229-1419P
  • Mfr. Part No. 0456040.DRSDE
Each (Supplied on a Reel)
HK$38.55
Temporarily out of stock
Better World
Siemens SENTRON 5SY4 MCB, 3+N, 8A Curve C, 400V AC, 72V DC, 5 kA Breaking Capacity
  • RS Stock No. 213-1075
  • Mfr. Part No. 5SY4608-7
Each
HK$1,417.20
In Stock
Better World
Schneider Electric Busbar Feed Unit, Canalis KBA Series
  • RS Stock No. 211-0357
  • Mfr. Part No. KBA40ABG4W
Each
HK$490.90
Temporarily out of stock
ABB System Pro M Compact S200M MCB, 3P, 13A Curve D, 400V AC, 125V DC, 15 kA Breaking Capacity
  • RS Stock No. 200-169
  • Mfr. Part No. 2CDS273001R0131
Each
HK$1,941.10
In Stock
Mersen 35A D02 Neozed Fuse, gG, 400V ac
  • RS Stock No. 377-0285
  • Mfr. Part No. R219826
Each (In a Pack of 5)
HK$15.92
Temporarily out of stock
Eaton 10A DI Bottle Fuse, 500V ac
  • RS Stock No. 229-228
  • Mfr. Part No. 10D16
1 Pack of 10
HK$305.60
In Stock
Eaton 250mA F Ceramic Cartridge Fuse, 5 x 20mm
  • RS Stock No. 537-1543
  • Mfr. Part No. S501-250-R
Each (In a Pack of 10)
HK$47.66
In Stock
Eaton 125mA T Glass Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 852-7106
  • Mfr. Part No. MDL-1-8-R
Each
HK$77.10
Temporarily out of stock
Siemens SENTRON Busbar
  • RS Stock No. 203-3234
  • Mfr. Part No. 8US1921-2BA01
Each (In a Pack of 15)
HK$28.593
In Stock
Littelfuse PC Board Non Resettable Fuse, Radial 250mA, 250V ac
  • RS Stock No. 895-1650P
  • Mfr. Part No. 37202500411
Each (Supplied in a Bag)
HK$6.099
Temporarily out of stock
ABB PBFC 3, 3+N Phase Busbar
  • RS Stock No. 202-500
  • Mfr. Part No. 1STQ007406A0000
Each
HK$5,067.68
Temporarily out of stock
Hager RCBO, 20A Current Rating, 1P+N Poles, 30mA Trip Sensitivity, Type AC
  • RS Stock No. 602-220
  • Mfr. Part No. ADC827F
Each
HK$2,362.20
Temporarily out of stock
Hager NFN MCB, 2P, 4A Curve C, 240 → 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 144-4710
  • Mfr. Part No. NFN204
Each
HK$1,193.37
In Stock
Testo 630mA Cartridge Fuses
  • RS Stock No. 284-6811
  • Mfr. Part No. 0590 0006
Each
HK$221.70
In Stock
Mersen 8A Slow-Blow Ceramic Cartridge Fuse, 10 x 38mm
  • RS Stock No. 247-2917
  • Mfr. Part No. V219231
1 Box of 10
HK$324.90
In Stock
Better World
Schneider Electric Acti 9 A9N1 MCB, 2P, 100A Curve C
  • RS Stock No. 219-8296
  • Mfr. Part No. A9N18458
Each
HK$2,389.00
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