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

108 of 999+
Schneider Electric Acti9 1 Phase Distribution Board, 16 Way
  • RS Stock No. 339-832
  • Mfr. Part No. SEA9DE32
Each
HK$2,151.70
ABB RCBO, 20A Current Rating, 1P+N Poles, 30mA Trip Sensitivity, Type C, System Pro M Compact Range
  • RS Stock No. 914-4051
  • Mfr. Part No. 2CSR255051R1204 DSE201 C20 AC30 - N Blue
Each
HK$684.40
Phoenix Contact Surge Protector, 440V ac, DIN Rail Mount
  • RS Stock No. 265-7529
  • Mfr. Part No. 2906450
Each
HK$964.40
Eaton xPole MCB, 2P, 16A Curve D, 48V DC, 10 kA Breaking Capacity
  • RS Stock No. 864-4370
  • Mfr. Part No. 242428 PLSM-D16/2-MW
Each
HK$586.00
Schneider Electric RCBO, 20A Current Rating, 2P Poles, 30mA Trip Sensitivity, Type C, Acti9 Range
  • RS Stock No. 654-789
  • Mfr. Part No. A9D19220
Each
HK$4,343.80
Schneider Electric Acti9 3 Phase Busbar, 415V ac, 18mm Pitch
  • RS Stock No. 212-255
  • Mfr. Part No. A9XPH416
Each
HK$343.48
Better World
Siemens, Sentron MCCB Molded Case Circuit Breaker 3P 40A, Breaking Capacity 2.5 kA
  • RS Stock No. 245-763
  • Mfr. Part No. 3VA6140-7HM31-0AA0
Each
HK$9,093.00
Siemens, SENTRON MCCB Molded Case Circuit Breaker 1P 25A, Breaking Capacity 18 kA, Cable Mount, Panel Mount
  • RS Stock No. 148-315
  • Mfr. Part No. 3VA5125-5ED11-1AA0
Each
HK$1,243.30
Eaton 450A Tag Fuse, 660V ac, 133/184mm
  • RS Stock No. 261-695
  • Mfr. Part No. TTM450
Each
HK$2,585.50
ABB System Pro M Compact S200 M UC MCB, 1P, 3A Curve K, 230V AC, 220V DC, 10 kA Breaking Capacity
  • RS Stock No. 203-816
  • Mfr. Part No. 2CDS271061R0317
Each
HK$1,161.85
ABB S802S MCB, 2P, 6A Curve C, 690V AC, 50 kA Breaking Capacity
  • RS Stock No. 140-493
  • Mfr. Part No. 2CCS862001R0064
Each
HK$5,271.10
Better World
Siemens SENTRON Electronic Circuit Breaker 400A 3VA, 4 channels
  • RS Stock No. 156-739
  • Mfr. Part No. 3VA2340-5JP42-0AA0
Each
HK$30,913.60
HENSEL ENYBOARD Distribution Board, 63 A
  • RS Stock No. 117-582
  • Mfr. Part No. KV 3654 M
Each
HK$2,058.70
Better World
Schneider Electric Ins250, Nsx100...250 Downstream Coupling Connector for use with Source Changeover Systems
  • RS Stock No. 221-1208
  • Mfr. Part No. LV429359
Each
HK$7,252.89
Acti9 Busbar, 415V ac, 18mm Pitch
  • RS Stock No. 585-483
  • Mfr. Part No. A9XPH316
1 Pack of 5
HK$3,167.10
Eaton 25A D02 Neozed Fuse, gG, 400V ac
  • RS Stock No. 181-8898
  • Mfr. Part No. 25NZ02
Each
HK$29.83
Schurter 12A F Melamine Cartridge Fuse, 10 x 38mm
  • RS Stock No. 712-4774P
  • Mfr. Part No. 0090.0012
Each (Supplied in a Box)
HK$123.50
Better World
ABB System Pro M Compact S200 MCB, 1+N, 13A Curve D
  • RS Stock No. 237-3195
  • Mfr. Part No. 2CDS251103R0131
Each
HK$777.33
Phoenix Contact Surge Protector, DIN Rail Mount
  • RS Stock No. 131-447
  • Mfr. Part No. 2800994
Each
HK$1,614.84
Siemens SENTRON 5SJ4335 MCB, 3P, 35A Curve C, 400V AC, 60V DC, 14 kA Breaking Capacity
  • RS Stock No. 299-993
  • Mfr. Part No. 5SJ4335-7HG41
Each
HK$3,656.50
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