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

146 of 999+
Temporarily out of stock
Better World
ABB, XT2H MCCB 4P 63A, Fixed Mount
  • RS Stock No. 236-7559
  • Mfr. Part No. 1SDA067910R1 XT2H 160 Ekip LSIG 63A FF
Each
HK$15,255.94
Temporarily out of stock
Hager CDC RCD Switch, 63A, 2 Pole, 30mA, Type AC, 230V
  • RS Stock No. 599-832
  • Mfr. Part No. CDC768F
Each
HK$1,408.10
In Stock
Mersen 32A Slow-Blow Ceramic Cartridge Fuse, 14 x 51mm
  • RS Stock No. 247-2820
  • Mfr. Part No. L1010170
1 Box of 10
HK$677.10
In Stock
Schurter SMD Non Resettable Fuse 2A, 250 V ac, 125V dc
  • RS Stock No. 876-1936P
  • Mfr. Part No. 3404.2469.22
Each (Supplied on a Reel)
HK$9.28
In Stock
SIBA 500mA F Ceramic Cartridge Fuse, 5 x 20mm
  • RS Stock No. 783-3214
  • Mfr. Part No. 70-007-33/0.5A
Each (In a Pack of 10)
HK$7.69
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 160A, Breaking Capacity 55 kA
  • RS Stock No. 210-1629
  • Mfr. Part No. 3VA1116-5EE32-0AA0
Each
HK$7,822.70
Temporarily out of stock
Better World
Schneider Electric Surge Suppressor Unit, 50 → 100V ac
  • RS Stock No. 210-9821
  • Mfr. Part No. LA4FRCF
Each
HK$792.85
Temporarily out of stock
Siemens SENTRON Interlock for use with 3VA51-54, 3VA61-64
  • RS Stock No. 161-610
  • Mfr. Part No. 3VA9078-0VM10
Each
HK$2,647.50
In Stock
Eaton 3.15A F Ceramic Cartridge Fuse, 5 x 20mm
  • RS Stock No. 169-9424
  • Mfr. Part No. S501-3.15-R
1 Bag of 1000
HK$2,310.50
Temporarily out of stock
Siemens SENTRON 5SY4 MCB, 2P, 2A, Type A, 230V AC, 60V DC, 35 kA Breaking Capacity
  • RS Stock No. 610-502
  • Mfr. Part No. 5SY4502-5
Each
HK$828.07
Temporarily out of stock
Siemens SENTRON Mounting Adapter for use with SIRIUS 3RV2
  • RS Stock No. 272-0200
  • Mfr. Part No. 3VA9137-0GX01
Each
HK$97.10
In Stock
Sensata Airpax Airpax Thermal Circuit Breaker - IEG66 2 Pole Panel Mount, 50A Current Rating
  • RS Stock No. 275-0209
  • Mfr. Part No. IEG66-1-62-50.0-AZ-01-V
1 Box of 5
HK$4,031.70
In Stock
Better World
Schneider Electric 32A Cartridge Fuse, 10 x 38mm
  • RS Stock No. 219-9058
  • Mfr. Part No. DF2CN32
Each (In a Pack of 10)
HK$65.25
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 30A, Breaking Capacity 10 kA, Cable Mount, Panel Mount
  • RS Stock No. 148-347
  • Mfr. Part No. 3VA5130-6EF41-0AA0
Each
HK$3,878.40
In Stock
Eaton 30A T Cartridge Fuse, 21 x 57mm
  • RS Stock No. 773-3546
  • Mfr. Part No. LPJ-30SP
Each
HK$815.20
Temporarily out of stock
Hager CFH RCCB, 40A, 3P+N Pole, 300mA, Type A-HI, 230 → 400V ac
  • RS Stock No. 597-934
  • Mfr. Part No. CFH840F
Each
HK$3,788.80
Temporarily out of stock
Eaton RCCB, 40A, 4 Pole, 100mA, Type S, 230 V ac, 400 V ac
  • RS Stock No. 227-0730
  • Mfr. Part No. 264304 PFGM-40/4/01-S
Each
HK$3,101.76
In Stock
Schneider Electric Acti9 iID RCCB, 40A, 2 Pole, 300mA, Type B-SI, 230V ac
  • RS Stock No. 655-453
  • Mfr. Part No. A9Z64240
Each
HK$16,388.02
In Stock
Eaton 1A F Melamine Cartridge Fuse, 10 x 38mm
  • RS Stock No. 848-3908
  • Mfr. Part No. KTK-R-1
Each
HK$379.40
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 30A, Breaking Capacity 10 kA, Cable Mount, Panel Mount
  • RS Stock No. 148-346
  • Mfr. Part No. 3VA5130-6EF31-0AA0
Each
HK$4,828.60
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