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

147 of 999+
Temporarily out of stock
Eaton, DILER MCCB 6A, DIN Rail Mount
  • RS Stock No. 248-178
  • Mfr. Part No. 051779 DILER-22(400V50HZ,440V60HZ)
Each
HK$453.87
In Stock
Eaton xEffect MCB, 1P, 63A Curve C, 240V AC, 48V DC, 10 kA Breaking Capacity
  • RS Stock No. 922-7015
  • Mfr. Part No. 278567 FAZ-C63/1
Each
HK$240.20
In Stock
ABB Tmax XT Handle, Lockable for use with Circuit Breaker
  • RS Stock No. 231-9360
  • Mfr. Part No. 1SDA104853R1 RHE XT6 F/P
Each
HK$1,919.20
Temporarily out of stock
Siemens, SENTRON MCCB 3P 175A, Breaking Capacity 10 kA, Fixed Mount
  • RS Stock No. 147-502
  • Mfr. Part No. 3VA5217-7EC31-2AA0
Each
HK$10,763.10
Temporarily out of stock
Hager BS RCD, 63A, 3 Pole, 300mA, Type AC, 230 → 400V
  • RS Stock No. 599-770
  • Mfr. Part No. BS364
Each
HK$4,770.70
Temporarily out of stock
Hager BD Series RCCB, 40A, 3 Pole, 30mA, Type AC, 400V
  • RS Stock No. 597-895
  • Mfr. Part No. BD346
Each
HK$3,411.90
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 63A, Breaking Capacity 55 kA, Fixed Mount
  • RS Stock No. 211-3772
  • Mfr. Part No. 3VA2063-5KP32-0AA0
Each
HK$11,353.10
Temporarily out of stock
Schneider Electric RCBO, 6A Current Rating, 1P+N Poles, 30mA Trip Sensitivity, Type B, Acti9 Range
  • RS Stock No. 654-795
  • Mfr. Part No. A9DH3606
Each
HK$3,038.90
Temporarily out of stock
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 400A, Breaking Capacity 110 kA, DIN Rail Mount
  • RS Stock No. 271-9499
  • Mfr. Part No. 3VA1340-7EF42-0AA0
Each
HK$24,692.20
Temporarily out of stock
16A Tag Fuse, 440V ac
  • RS Stock No. 263-426
  • Mfr. Part No. XS16
1 Pack of 10
HK$3,018.90
In Stock
Better World
Schneider Electric Acti 9 iC60N MCB, 3P, 16A Curve C, 400V AC, 12 → 144V DC, 6 kA Breaking Capacity
  • RS Stock No. 734-9150
  • Mfr. Part No. A9F77316
Each
HK$1,371.10
Temporarily out of stock
ABB MCCB Molded Case Circuit Breaker 3P+N 400A, Fixed Mount
  • RS Stock No. 250-4168
  • Mfr. Part No. 1SDA054439R1
Each
HK$37,552.61
Temporarily out of stock
Siemens 5SM26 RCCB, 40A, 3 Pole, 300mA, Type AC, 400V
  • RS Stock No. 328-420
  • Mfr. Part No. 5SM2633-0
Each
HK$813.81
Temporarily out of stock
Better World
Siemens, Sentron MCCB Molded Case Circuit Breaker 4P 40A, Breaking Capacity 2.5 kA
  • RS Stock No. 245-693
  • Mfr. Part No. 3VA6140-7HN41-0AA0
Each
HK$9,216.70
Temporarily out of stock
Better World
ABB Emax2 Electronic Circuit Breaker 1kA 1SDA07, 3 channels
  • RS Stock No. 259-3079
  • Mfr. Part No. 1SDA070933R1
Each
HK$61,921.22
In Stock
Eaton 2A F Ceramic Cartridge Fuse, 5 x 20mm
  • RS Stock No. 169-9425
  • Mfr. Part No. S501-2-R
1 Bag of 1000
HK$5,400.60
Temporarily out of stock
Wickmann 4A T Ceramic Cartridge Fuse, 5 x 20mm
  • RS Stock No. 174-0240
  • Mfr. Part No. 0477004.MXP
1 Box of 1000
HK$10,808.80
In Stock
RS PRO 30A Rail Mount Fuse Holder for 5 x 20mm Fuse, 1P, 500V
  • RS Stock No. 242-0501
1 Bag of 10
HK$1,538.75
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 100A, Breaking Capacity 85 kA, Fixed Mount
  • RS Stock No. 270-3566
  • Mfr. Part No. 3VA2010-6KQ42-0AA0
Each
HK$37,743.20
In Stock
WJ Furse Copper Earth Bar L. 725mm x W. 90mm x H. 96mm 10 Ways
  • RS Stock No. 124-2502
  • Mfr. Part No. 7TCA083670R0647 LK243-10
Each
HK$2,318.70
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