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

46 of 999+
Last RS stock
Eaton 6A F Glass Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 848-2933
  • Mfr. Part No. AGC-6-R
Each
HK$32.50
In Stock
Schurter 16A Panel Mount Fuse Holder for 6.3 x 32mm Fuse, 2P, 600V ac
  • RS Stock No. 144-1834
  • Mfr. Part No. 0031.9161
Each
HK$152.70
Currently unavailable
Altech Thermal Circuit Breaker - V-EA 2 Pole 277V Voltage Rating DIN Rail Mount, 40A Current Rating
  • RS Stock No. 899-1799
  • Mfr. Part No. 2E40UM
Each
HK$340.20
In Stock
ABB S800S MCB, 1P, 13A Curve C, 240V AC, 50 kA Breaking Capacity
  • RS Stock No. 140-345
  • Mfr. Part No. 2CCS861001R0134
Each
HK$1,470.23
In Stock
Better World
Schneider Electric RCBO, 40A Current Rating, 1P Poles, 30mA Trip Sensitivity, Acti9 Range
  • RS Stock No. 201-2240
  • Mfr. Part No. A9DC3640
Each
HK$1,931.60
In Stock
Better World
Schneider Electric Acti 9 C60H-DC MCB, 2P, 10A Curve C, 500V DC
  • RS Stock No. 772-1521
  • Mfr. Part No. A9N61528
Each
HK$1,688.10
In Stock
ABB, SACE Tmax T MCCB Molded Case Circuit Breaker 3P 630A, Breaking Capacity 20 kA, Fixed Mount
  • RS Stock No. 232-0088
  • Mfr. Part No. 1SDA054396R1 T5N630 FF PR221-LS 630A
Each
HK$15,115.30
In Stock
Eaton 5A T Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 848-3838
  • Mfr. Part No. GDC-5A
Each
HK$56.28
In Stock
Eaton Nickel Plated Copper Fuse Clip for 1in Cartridge Fuse
  • RS Stock No. 703-4192
  • Mfr. Part No. A3354705
Each
HK$294.70
In Stock
Siemens SENTRON Auxiliary Switch Kit for use with 3VA1 and 3VA20 up → 3VA25
  • RS Stock No. 210-9427
  • Mfr. Part No. 3VA9988-0AA22
Each
HK$268.80
In Stock
Phoenix Contact Thermal Circuit Breaker - TMC 1 Single Pole 65 V dc, 250V ac Voltage Rating DIN Rail Mount, 2A Current
  • RS Stock No. 801-6983
  • Mfr. Part No. 0914099
Each
HK$653.80
In Stock
Better World
Siemens SENTRON for use with MCCB
  • RS Stock No. 218-1881
  • Mfr. Part No. 3VA9988-0BL30
Each
HK$703.90
Temporarily out of stock
Siemens SENTRON Short circuit alarm switch for use with 3VA1 250/400/630
  • RS Stock No. 210-3532
  • Mfr. Part No. 3VA9988-0AB34
Each
HK$294.30
Temporarily out of stock
Siemens SENTRON 3VA9 Terminal for use with 3VA1 160
  • RS Stock No. 218-1786
  • Mfr. Part No. 3VA9113-0QE00
Each
HK$391.40
Temporarily out of stock
Siemens SENTRON 3VA9 Wire Connector for use with 3VA1 100/160
  • RS Stock No. 218-1789
  • Mfr. Part No. 3VA9114-0JF60
Each
HK$1,146.80
In Stock
Better World
Siemens Sentron for use with 3VA Series Circuit Breaker
  • RS Stock No. 874-4540
  • Mfr. Part No. 3VA9988-0BL33
Each
HK$703.90
Temporarily out of stock
Siemens SENTRON Wire Connector for use with 3VA1 400/630 and 3VA2 400/630
  • RS Stock No. 210-9404
  • Mfr. Part No. 3VA9483-0QB00
Each
HK$561.30
In Stock
Contactum RCBO, 16A Current Rating, 1P Poles, 30mA Trip Sensitivity, Type B, CCPBR Range
  • RS Stock No. 240-6384
  • Mfr. Part No. CCPBR0616AB
Each
HK$212.00
Temporarily out of stock
Siemens SENTRON Kit for use with Manual Operators 3VA 3VA2 100/160/250/400/630
  • RS Stock No. 218-3322
  • Mfr. Part No. 8UD1900-0KA20
Each
HK$362.30
In Stock
Siemens Sentron Handle Locking Device for use with 3VA1 100/160
  • RS Stock No. 874-4442
  • Mfr. Part No. 3VA9088-0LB10
Each
HK$351.40
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