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

89 of 999+
Temporarily out of stock
Siemens, Sentron MCCB Molded Case Circuit Breaker 4P 1kA, Breaking Capacity 35 kA
  • RS Stock No. 249-143
  • Mfr. Part No. 3VA6610-6KT42-0AA0
Each
HK$92,914.00
In Stock
Better World
Schneider Electric RCD, 32A Current Rating, 1P+N Poles, Type AB, Easy9 Range
  • RS Stock No. 850-8669
  • Mfr. Part No. EZ9D16832
Each
HK$427.90
Temporarily out of stock
Siemens SENTRON 5SY Circuit Breaker, 3P+N, 63A Curve D, 440V AC, 60V DC, 20 kA Breaking Capacity
  • RS Stock No. 664-338
  • Mfr. Part No. 5SY8663-8
Each
HK$5,696.51
In Stock
RS PRO Non Resettable Fuse 1A, 250V ac
  • RS Stock No. 139-952
1 Bag of 10
HK$149.06
Temporarily out of stock
ABB S804S MCB, 4P, 8A Curve B, 690V AC, 50 kA Breaking Capacity
  • RS Stock No. 141-193
  • Mfr. Part No. 2CCS864001R0085
Each
HK$7,134.01
Temporarily out of stock
ABB S800U MCB, 2P, 90A Curve K, 240V AC, 50 kA Breaking Capacity
  • RS Stock No. 141-174
  • Mfr. Part No. 2CCS862017R0907
Each
HK$6,800.89
Temporarily out of stock
Siemens 32A Cartridge Fuse, 22 X 58mm
  • RS Stock No. 665-078
  • Mfr. Part No. 3NW8212-1
1 Pack of 10
HK$958.70
In Stock
ABB RCBO, 16A Current Rating, 4P Poles, Type C
  • RS Stock No. 237-5098
  • Mfr. Part No. 2CSR254001R1164
Each
HK$2,368.00
Temporarily out of stock
Better World
Schneider Electric Vertical Distribution Busbar Trunking, 0.8m, 630A, Canalis KS Series
  • RS Stock No. 211-0478
  • Mfr. Part No. KSA630ED4081
Each
HK$24,108.60
Temporarily out of stock
SENTRON Wire Connector for use with 3VA61/62 Series
  • RS Stock No. 263-919
  • Mfr. Part No. 3VA9243-0JG12
1 Kit
HK$579.40
Temporarily out of stock
HENSEL ENYMOD Distribution Board
  • RS Stock No. 117-377
  • Mfr. Part No. Mi 1684
Each
HK$6,326.00
Temporarily out of stock
HENSEL ENYBOARD Distribution Board, 75 A
  • RS Stock No. 117-324
  • Mfr. Part No. FC N 30
Each
HK$274.80
Temporarily out of stock
ABB, Tmax MCCB 4P 320A, Fixed Mount
  • RS Stock No. 237-5957
  • Mfr. Part No. 1SDA054147R1 T4L320 FF PR222-LSI 320A
Each
HK$24,798.89
Temporarily out of stock
Better World
Siemens, Sentron MCCB Molded Case Circuit Breaker 3P 40A, Breaking Capacity 2.5 kA
  • RS Stock No. 245-508
  • Mfr. Part No. 3VA6140-6KT31-2AA0
Each
HK$16,515.80
Temporarily out of stock
Eaton 90A Cartridge Fuses, 76.2 x 565mm
  • RS Stock No. 253-691
  • Mfr. Part No. 24AFIHA90
Each
HK$12,608.40
In Stock
Schneider Electric Removable Lock for use with Compact NB400, Compact NB600, Compact NG160, Compact NR100, Compact
  • RS Stock No. 188-1209
  • Mfr. Part No. 29370
Each
HK$259.90
Temporarily out of stock
Siemens 400A Fuse Holder for 267 x 256mm Fuse, 3P, 600V
  • RS Stock No. 299-757
  • Mfr. Part No. 3NW7531-8HG
Each
HK$5,424.20
Temporarily out of stock
Eaton 160A NH Fuse, 63 x 40 x 135mm, 690V ac
  • RS Stock No. 240-196
  • Mfr. Part No. 160NHG1B-690 NH FUSE 160A 690V GG SIZE 1
1 Pack of 3
HK$373.80
Temporarily out of stock
200A NH Fuse, 63 x 40 x 135mm, 690V ac
  • RS Stock No. 252-963
  • Mfr. Part No. 200NHG1B-690 NH FUSE 200A 690V gG SIZE 1
1 Pack of 3
HK$373.80
Temporarily out of stock
ABB S204L MCB, 4P, 63A Curve D, 400V AC, 6 kA Breaking Capacity
  • RS Stock No. 201-401
  • Mfr. Part No. 2CDS244701R0631
Each
HK$4,548.45
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