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

68 of 999+
Siemens 4A Cartridge Fuse, 10 x 38mm
  • RS Stock No. 232-2044
  • Mfr. Part No. 3NW6004-4
Each (In a Pack of 20)
HK$170.235
Schurter Non-Resettable Wire Ended Fuse 2A, 250V ac
  • RS Stock No. 703-2629
  • Mfr. Part No. 8020.0517.PT
Each (In a Pack of 10)
HK$3.37
Littelfuse PC Board Non Resettable Fuse, Radial 4A, 250V ac
  • RS Stock No. 226-0614
  • Mfr. Part No. 37214000001
Each (In a Pack of 10)
HK$5.95
Schurter 10A Panel Mount Fuse Holder for 5 x 20mm Fuse, 1P, 400V ac
  • RS Stock No. 867-4362
  • Mfr. Part No. 3101.0210
Each (In a Pack of 100)
HK$19.529
Eaton MEMShield MCB, 1P, 40A Curve B, 230V AC, 48V DC, 10 kA Breaking Capacity
  • RS Stock No. 124-3027
  • Mfr. Part No. EMBH140 EMBH140
Each
HK$229.70
Better World
ABB System Pro M Compact S200 MCB, 1P, 3A Curve K, 230V AC, 72V DC, 10 kA Breaking Capacity
  • RS Stock No. 746-7946
  • Mfr. Part No. 2CDS251001R0317 S201-K3
Each
HK$263.40
ABB Emax 2, Tmax XT Signalling Module for use with Circuit Breaker
  • RS Stock No. 231-9321
  • Mfr. Part No. 1SDA074167R1 EKIP 2K-1 E1.2..E6.2-Tmax
Each
HK$1,460.00
Limitor Thermal Fuse +80°C 2.5 A, 250V ac
  • RS Stock No. 204-7427
  • Mfr. Part No. Q82 A 80 05 100
Each
HK$37.50
Schneider Electric Busbar End Feed Unit, 250A, Canalis Series
  • RS Stock No. 119-275
  • Mfr. Part No. KSA250ABDD4
Each
HK$27,963.43
ABB System Pro M Compact S200M MCB, 1+N, 3A Curve C, 230V AC, 60V DC, 15 kA Breaking Capacity
  • RS Stock No. 203-835
  • Mfr. Part No. 2CDS271103R0034
Each
HK$1,323.98
Better World
Siemens SENTRON 5SL4 MCB, 3+N, 63A Curve B, 400V AC, 72V DC
  • RS Stock No. 209-7477
  • Mfr. Part No. 5SL4463-6
Each
HK$2,279.10
Phoenix Contact Surge Protector, DIN Rail Mount
  • RS Stock No. 207-2788
  • Mfr. Part No. 2908192
Each
HK$1,223.10
Wurth Elektronik 10A Panel Mount Fuse Holder for 5 x 20mm Fuse, 1P, 250V ac
  • RS Stock No. 893-0609
  • Mfr. Part No. 696212001002
Each (In a Pack of 5)
HK$12.00
ABB System Pro M Compact S200 M UC MCB, 2P, 4A, Type Z, 400V AC, 440V DC, 10 kA Breaking Capacity
  • RS Stock No. 200-063
  • Mfr. Part No. 2CDS272061R0338
Each
HK$2,515.00
RS PRO 10A British Standard Fuse, A2, 550V ac, 73mm
  • RS Stock No. 521-2573
Each (In a Pack of 5)
HK$38.36
ABB FH200 RCCB, 40A, 4 Pole, 30mA, Type AC, 230V
  • RS Stock No. 540-1650
  • Mfr. Part No. 2CSF204006R1400 FH204 AC-40/0,03
Each
HK$1,361.87
RS PRO 32A British Standard Fuse, A2, 550V ac, 73mm
  • RS Stock No. 521-2624
Each (In a Pack of 5)
HK$50.38
Better World
Schneider Electric Acti 9 C120N MCB, 3P, 125A Curve C, 440V AC, 375V DC, 10 kA, 20 kA Breaking Capacity
  • RS Stock No. 776-3076
  • Mfr. Part No. A9N18369
Each
HK$7,266.20
Schurter 10A F Glass Cartridge Fuse, 5 x 20mm
  • RS Stock No. 269-3859
  • Mfr. Part No. 7010.3530
Each
HK$6.40
Siemens SENTRON Trip Alarm Switch for use with 3VA4/5/6
  • RS Stock No. 155-290
  • Mfr. Part No. 3VA9978-0AB11
Each
HK$360.00
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