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

47266 Products showing for Fuses & Circuit Breakers

20 of 999+
In Stock
Siemens 6A Cartridge Fuse, 14 x 51mm
  • RS Stock No. 396-342
  • Mfr. Part No. 3NC1406
Each (In a Pack of 10)
HK$219.40
In Stock
Schurter 6.3A Inline Fuse Holder for 6.3 x 32mm Fuse, 32V dc
  • RS Stock No. 703-2827
  • Mfr. Part No. 8601.2005.08
Each (In a Bag of 10)
HK$11.49
In Stock
ABB Tmax XT Rotary Handle for use with SACE Tmax XT
  • RS Stock No. 236-6854
  • Mfr. Part No. 1SDA069054R1 RHD_EM XT2-XT4 F/P EMERG
Each
HK$915.51
In Stock
Mersen 250mA FA Ceramic Cartridge Fuse, 5 x 20mm
  • RS Stock No. 188-6530
  • Mfr. Part No. G084002
Each (In a Pack of 10)
HK$26.55
Temporarily out of stock
Better World
Siemens 5SV3 RCCB, 40A, 4 Pole, 100mA, Type A, 400V ac
  • RS Stock No. 209-6573
  • Mfr. Part No. 5SV3444-8
Each
HK$2,023.10
Temporarily out of stock
Legrand 39 Way High Impact Polystyrene Consumer Unit, 90A, IP30 Drivia
  • RS Stock No. 786-5630
  • Mfr. Part No. 4 012 13
Each
HK$1,199.43
Temporarily out of stock
ABB Flange for use with Tmax XT
  • RS Stock No. 236-6851
  • Mfr. Part No. 1SDA068655R1
Each
HK$461.80
In Stock
Schurter 6.3A Inline Fuse Holder for 5 x 20mm Fuse, 32V dc
  • RS Stock No. 173-7932
  • Mfr. Part No. 8601.2000
Each (In a Box of 50)
HK$9.516
In Stock
Better World
Siemens Surge Protector, 24 → 48 V ac, 24 → 70V dc, Clip-On Mount
  • RS Stock No. 875-1080
  • Mfr. Part No. 3RT2936-1BB00
Each
HK$140.20
In Stock
Littelfuse SMD Fuse Block 5A, 125V ac/dc
  • RS Stock No. 769-3716
  • Mfr. Part No. 0154005.DR
Each (In a Pack of 10)
HK$14.74
In Stock
Eaton xPole MCB, 1P, 10A Curve C, 48V DC, 10 kA Breaking Capacity
  • RS Stock No. 864-4318
  • Mfr. Part No. 242202 PLSM-C10-MW
Each
HK$179.80
In Stock
Eaton 160A British Standard Fuse, FEE, 500 V dc, 690V ac, 70mm
  • RS Stock No. 156-9049
  • Mfr. Part No. 160FEE
Each
HK$329.50
In Stock
Bourns 1.85A Resettable Fuse, 72V
  • RS Stock No. 647-8718
  • Mfr. Part No. MF-RX185/72-0
Each (In a Pack of 10)
HK$3.23
Temporarily out of stock
Schneider Electric ComPacT New Generation Trip Unit for use with ComPacT NSX 250 DC
  • RS Stock No. 260-7838
  • Mfr. Part No. C253TM200D
Each
HK$6,771.00
In Stock
Schneider Electric RCBO, 20A Current Rating, 1P+N Poles, 30mA Trip Sensitivity, Type B, Resi9 Range
  • RS Stock No. 212-081
  • Mfr. Part No. R9D01620
Each
HK$1,241.68
In Stock
ABB System Pro M Compact SU200M MCB, 1P, 10A Curve K, 277V AC, 277V DC, 15 kA Breaking Capacity
  • RS Stock No. 231-9718
  • Mfr. Part No. 2CDS271337R0427 SU201M-K10
1 Box of 1
HK$446.50
Temporarily out of stock
ABB AC Switch Disconnectors Accessories Interlock for use with Switch Fuses
  • RS Stock No. 259-9733
  • Mfr. Part No. 1SCA106542R1001
Each
HK$1,823.69
In Stock
Better World
Schneider Electric iID RCCB, 63A, 4 Pole, 30mA
  • RS Stock No. 734-9138
  • Mfr. Part No. A9R11463
Each
HK$3,559.90
In Stock
ETI 10A DII Diazed Fuse, E27 Thread Size, gG - gL, 500V ac
  • RS Stock No. 413-658
  • Mfr. Part No. 2312404
Each (In a Pack of 5)
HK$7.40
In Stock
Eaton 32A British Standard Fuse, A2, 550V ac, 73mm
  • RS Stock No. 413-377
  • Mfr. Part No. AAO32
Each (In a Pack of 5)
HK$83.62
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