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

189 of 999+
In Stock
Schurter Panel Mount Fuse Holder for 5 x 20mm Fuse, 500V ac
  • RS Stock No. 123-8467
  • Mfr. Part No. 0031.1611
Each
HK$41.60
Temporarily out of stock
Schneider Electric A9R RCCB, 80A, 4 Pole, 500mA, Type A-SI, 415V ac
  • RS Stock No. 339-776
  • Mfr. Part No. A9R37480
Each
HK$7,772.49
In Stock
Phoenix Contact CB Electronic Circuit breaker 2A 24V CB E1, On Base Element
  • RS Stock No. 217-6383
  • Mfr. Part No. 2800902
Each
HK$407.20
In Stock
Finder 3 Phase Surge Protector, 40kA, 275V ac
  • RS Stock No. 257-7421
  • Mfr. Part No. 7P2482751020
Each
HK$1,478.82
In Stock
Better World
Siemens 5SV4644 RCCB, 40A, 4 Pole, 300mA, Type AC, 400V ac
  • RS Stock No. 231-8399
  • Mfr. Part No. 5SV4644-0
Each
HK$1,328.30
Temporarily out of stock
Socomec 160A Base Mount Fuse Holder for 0 Fuse, 690V
  • RS Stock No. 224-2562
  • Mfr. Part No. 63013016
Each
HK$2,710.03
Temporarily out of stock
Schurter Thermal Circuit Breaker - TA45 2 Pole 60 V dc, 240V ac Voltage Rating Panel Mount, 5A Current Rating
  • RS Stock No. 868-9184
  • Mfr. Part No. 4430.2295
Each (In a Pack of 20)
HK$223.355
Temporarily out of stock
Siemens SENTRON 5SY4 MCB, 3P, 63A, Type A, 400V AC, 60V DC, 15 kA Breaking Capacity
  • RS Stock No. 610-305
  • Mfr. Part No. 5SY4363-5
Each
HK$3,527.31
Temporarily out of stock
Hager NSN MCB, 3P, 63A Curve D, 415V AC, 15 kA Breaking Capacity
  • RS Stock No. 597-961
  • Mfr. Part No. NSN363
Each
HK$3,799.60
In Stock
Eaton 4A Ceramic Cartridge Fuse, 14 x 51mm
  • RS Stock No. 703-8412
  • Mfr. Part No. C14G4
Each (In a Pack of 10)
HK$14.97
Temporarily out of stock
Carling Technologies Thermal Circuit Breaker - E Single Pole 600V Voltage Rating Panel Mount, 5A Current Rating
  • RS Stock No. 881-1261
  • Mfr. Part No. EA1-B0-26-450-32E-FB
Each
HK$342.80
Temporarily out of stock
Siemens 3RV29 Motor Operator for use with Motor circuit breaker
  • RS Stock No. 218-2906
  • Mfr. Part No. 3RV2928-1A
Each
HK$956.60
In Stock
Phoenix Contact Thermomagnetic Device Circuit Breaker Thermal Circuit Breaker - CB Single Pole 50V dc Voltage Rating,
  • RS Stock No. 212-8789
  • Mfr. Part No. 2800861
Each
HK$360.50
Temporarily out of stock
Siemens SENTRON Communication Module for use with 3VA2 400/630/1000
  • RS Stock No. 210-9383
  • Mfr. Part No. 3VA9387-0TB10
Each
HK$4,245.30
In Stock
Siemens 3RV2917 Terminal Block for use with Power Outlet
  • RS Stock No. 203-3861
  • Mfr. Part No. 3RV2917-5FA00
Each
HK$209.80
Temporarily out of stock
Siemens SENTRON Front Plate for use with 3VA1 100/160
  • RS Stock No. 210-9303
  • Mfr. Part No. 3VA9154-0KB05
Each
HK$514.10
In Stock
Schurter CSO Silver Plated Copper Alloy Screw Mount Fuse Clip for 10.3 x 38mm Cartridge Fuse
  • RS Stock No. 893-6982
  • Mfr. Part No. 0751.0501
Each (In a Pack of 10)
HK$11.69
Temporarily out of stock
Schneider Electric RCBO, 10A Current Rating, 1P+N Poles, 30mA Trip Sensitivity, Type C, Acti9 Range
  • RS Stock No. 654-840
  • Mfr. Part No. A9DC4610
Each
HK$3,998.40
In Stock
Europa EUC2P EUC MCB, 2P, 32A Curve C, 230V AC, 10 kA Breaking Capacity
  • RS Stock No. 849-6557
  • Mfr. Part No. EUC2P32C
Each
HK$129.10
Temporarily out of stock
Siemens SENTRON 5SY8 MCB, 4P, 32A Curve D, 400V AC, 60V DC, 30 kA Breaking Capacity
  • RS Stock No. 610-666
  • Mfr. Part No. 5SY8432-8
Each
HK$3,508.44
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