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

2318 of 999+
Currently unavailable
ABB, T4H MCCB 3P 320A, Fixed Mount
  • RS Stock No. 237-5956
  • Mfr. Part No. 1SDA054133R1 T4H320 FF PR221-LS 320A
Each
HK$11,320.35
Temporarily out of stock
ABB System Pro M Compact S300P MCB, 3+N, 13A Curve K, 415V AC, 25 kA Breaking Capacity
  • RS Stock No. 203-800
  • Mfr. Part No. 2CDS383103R0447
Each
HK$4,586.13
Last RS stock
Schurter PC Board Non Resettable Fuse, Axial 2A, 125V ac/dc
  • RS Stock No. 167-6276
  • Mfr. Part No. 7010.6380.13
Each (In a Pack of 5)
HK$9.506
In Stock
Better World
Schneider Electric, Power Tag, 2mA, POWERTAG, 2W, Wireless
  • RS Stock No. 248-3709
  • Mfr. Part No. A9XMC1D3
Each
HK$1,006.40
In Stock
Better World
Siemens Sentron 5SY4 MCB, 3P, 16A Curve D, 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 772-1379
  • Mfr. Part No. 5SY4316-8
Each
HK$1,033.10
Temporarily out of stock
ABB Emax2 Electronic Circuit Breaker 800A Ekip G Touch LSIG, 4 channels
  • RS Stock No. 259-4608
  • Mfr. Part No. 1SDA072877R1
Each
HK$96,394.39
Temporarily out of stock
Bourns 50A Tag Fuse, 38mm, 170V dc, 24.1mm
  • RS Stock No. 254-4222
  • Mfr. Part No. PF-NT2-50
Each (In a Box of 10)
HK$194.23
Temporarily out of stock
Better World
Siemens, Sentron MCCB Molded Case Circuit Breaker 3P 100A, Breaking Capacity 3 kA
  • RS Stock No. 245-235
  • Mfr. Part No. 3VA6210-6KT31-2AA0
Each
HK$23,691.20
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 40A, Breaking Capacity 65 kA, Fixed Mount
  • RS Stock No. 269-737
  • Mfr. Part No. 3VA5240-6ED41-2AA0
Each
HK$10,881.80
Temporarily out of stock
Siemens 1 Phase Surge Protector, Plug In Mount
  • RS Stock No. 213-1317
  • Mfr. Part No. 5SD7418-1
Each
HK$3,302.00
New product - Preorder today
FUSE 5X20MM H PACK (P)
  • RS Stock No. 565-495
  • Mfr. Part No. 0215002.HXP
Each
HK$316.85
Temporarily out of stock
Schneider Electric, PowerPact MCCB 3P 60A, Breaking Capacity 25 kA, DIN Rail Mount
  • RS Stock No. 428-696
  • Mfr. Part No. NHJL36060U31X
Each
HK$25,638.22
Temporarily out of stock
Eaton RCBO, 13A Current Rating, 2P Poles, 30mA Trip Sensitivity, Type A, Type B, FRBmM Range
  • RS Stock No. 123-705
  • Mfr. Part No. 170887 FRBMM-B13/2/003-LIA
Each
HK$1,322.56
In Stock
Eaton 63A Fuse Holder for 30 x 25.5 x 25.5mm Fuse, 400V ac
  • RS Stock No. 248-252
  • Mfr. Part No. 100651 Z-D02/SK
1 Pack of 20
HK$192.70
In Stock
ABB, SACE Tmax XT MCCB Molded Case Circuit Breaker 3P 400A, Breaking Capacity 70 kA, Fixed Mount
  • RS Stock No. 231-9330
  • Mfr. Part No. 1SDA100354R1 XT5N 400 EkipDip LS/I 400
Each
HK$9,643.40
Temporarily out of stock
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 100A, Breaking Capacity 200 kA, Fixed Mount
  • RS Stock No. 268-563
  • Mfr. Part No. 3VA6110-0HM31-0AA0
Each
HK$15,067.10
Temporarily out of stock
Hager NEN MCB, 4P, 10A Curve B, 240 → 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 144-4698
  • Mfr. Part No. NEN410
Each
HK$2,397.74
Temporarily out of stock
ABB Tmax XT Trip Unit for use with Tmax XT
  • RS Stock No. 236-7216
  • Mfr. Part No. 1SDA067249R1 TMD 25-300 XT2 4p
Each
HK$2,377.22
Temporarily out of stock
Phoenix Contact Thermal Magnetic Circuit Breaker - TMC 2 Pole 250V ac Voltage Rating DIN Rail, 3A Current Rating
  • RS Stock No. 135-905
  • Mfr. Part No. 0915014
1 Pack of 3
HK$3,990.70
Temporarily out of stock
ABB RCBO, 16A Current Rating, 1P Poles, Type C
  • RS Stock No. 237-1417
  • Mfr. Part No. 2CSR275151R3164
Each
HK$1,325.52
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