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

65 of 999+
ABB Emax2 Electronic Circuit Breaker 1kA 1SDA07, 4 channels
  • RS Stock No. 259-4637
  • Mfr. Part No. 1SDA072910R1
Each
HK$104,563.21
Littelfuse 125A Grey, White CF Car Fuse, 58V dc
  • RS Stock No. 337-7943
  • Mfr. Part No. 155.0892.6121
Each
HK$80.90
Siemens SENTRON Wire Connector for use with 3VA1 100/160
  • RS Stock No. 210-9305
  • Mfr. Part No. 3VA9154-0QC00
Each
HK$925.40
Eaton Handle, Lockable for use with N(S)2(-4) Series, NZM2(-4) Series, PN2(-4) Series
  • RS Stock No. 537-5725
  • Mfr. Part No. 260180 NZM2-XTVDVR
Each
HK$803.00
WAGO Electronic Circuit Breaker 8A 24V 787, 1 channels , DIN Rail
  • RS Stock No. 279-4126
  • Mfr. Part No. 787-2861/108-020
Each
HK$543.10
Siemens SENTRON Wire Connector for use with 3VA1 250
  • RS Stock No. 210-9346
  • Mfr. Part No. 3VA9253-0QC00
Each
HK$760.30
Better World
Siemens, SENTRON MCCB 3P 40A, Breaking Capacity 150 kA, Fixed Mount
  • RS Stock No. 270-3801
  • Mfr. Part No. 3VA2040-8HN32-0AA0
Each
HK$9,619.90
Better World
Siemens, SENTRON MCCB 3P 80A, Breaking Capacity 36 kA, Fixed Mount
  • RS Stock No. 874-4345
  • Mfr. Part No. 3VA1180-4ED36-0AA0
Each
HK$3,548.80
Siemens Sentron Trip alarm switch for use with 3VA Series Circuit Breaker
  • RS Stock No. 874-4512
  • Mfr. Part No. 3VA9988-0AB11
Each
HK$293.70
Better World
Schneider Electric TeSys Thermal Circuit Breaker - TeSyS GV 3 Pole 690V ac Voltage Rating, 80A Current Rating
  • RS Stock No. 175-1554
  • Mfr. Part No. GV4PE80S
Each
HK$5,349.00
RS PRO 15A Inline Fuse Holder for 6x30/6.35x32mm Fuse, 500V ac/dc
  • RS Stock No. 237-5260
Each
HK$42.30
RS PRO 125A British Standard Fuse, A4, 415V ac, 93.7mm
  • RS Stock No. 521-2719
Each
HK$246.70
Better World
Siemens SENTRON 5SY4 MCB, 3+N, 13A Curve B, 400V AC, 72V DC, 5 kA Breaking Capacity
  • RS Stock No. 209-7516
  • Mfr. Part No. 5SY4613-6
Each
HK$1,308.30
Better World
Siemens SENTRON 5SL4 MCB, 2P, 500mA Curve D, 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 209-6466
  • Mfr. Part No. 5SL4205-8
Each
HK$952.10
Better World
Siemens SENTRON 5SY4 MCB, 1+N, 300mA Curve C, 230V AC, 72V DC, 5 kA Breaking Capacity
  • RS Stock No. 213-1072
  • Mfr. Part No. 5SY4514-7
Each
HK$626.90
Better World
Siemens SENTRON 5SL4 MCB, 3+N, 63A Curve B, 400V AC, 72V DC
  • RS Stock No. 209-7500
  • Mfr. Part No. 5SL4663-6
Each
HK$2,076.60
Eaton 80A NH Fuse, 58 x 30 x 135mm, 500V ac
  • RS Stock No. 259-309
  • Mfr. Part No. 290012 Z-NH-1/80
1 Pack of 3
HK$325.50
Schurter 10A Fuse Holder for 5 x 20mm Fuse, 1P, 250V ac
  • RS Stock No. 269-3814
  • Mfr. Part No. 3101.0120
Each
HK$35.30
Better World
Siemens Sentron 5SY4 MCB, 1+N, 10A Curve C, 230V AC, 10 kA Breaking Capacity
  • RS Stock No. 772-1420
  • Mfr. Part No. 5SY4510-7
Each
HK$646.90
ABB ZLS Universal Adapter for SMISSLINE TP System
  • RS Stock No. 231-9537
  • Mfr. Part No. 2CCA180556R0001 ZLS973
Each
HK$114.30
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