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

2330 of 999+
Temporarily out of stock
ABB Emax2 Electronic Circuit Breaker 3.2kA 1SDA07, 3 channels
  • RS Stock No. 259-4348
  • Mfr. Part No. 1SDA072518R1
Each
HK$189,193.86
In Stock
Eaton 20A Rail Mount Fuse Holder for A1 Fuse, 1P, 690V ac
  • RS Stock No. 182-1821
  • Mfr. Part No. RS20HGY
Each
HK$262.50
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 25A, Breaking Capacity 55 kA, Fixed Mount
  • RS Stock No. 211-3780
  • Mfr. Part No. 3VA2125-5HL46-0AA0
Each
HK$7,111.40
Temporarily out of stock
Residual Current Circuit Breaker
  • RS Stock No. 599-632
  • Mfr. Part No. 2CCL463111E0324
Each
HK$3,754.60
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 800A, Breaking Capacity 35 kA, Fixed Mount
  • RS Stock No. 249-535
  • Mfr. Part No. 3VA6580-5HN42-0AA0
Each
HK$50,307.50
Temporarily out of stock
Siemens 5SM26 RCCB, 100A, 2 Pole, 300mA, Type A, 230V
  • RS Stock No. 328-396
  • Mfr. Part No. 5SM2627-6
Each
HK$2,827.41
Temporarily out of stock
Eaton xEffect - FBSmV RCCB, 40A, 4 Pole, 300mA, Type S, 240/415V ac
  • RS Stock No. 121-237
  • Mfr. Part No. 170154 FBSMV-40/4/03-S
Each
HK$1,588.50
In Stock
RS PRO PC Board Non Resettable Fuse 1.25A, 250V ac
  • RS Stock No. 911-3543
Each (In a Pack of 10)
HK$1.12
In Stock
Sensata Airpax Airpax Thermal Circuit Breaker - IELH11 2 Pole Panel Mount, 40A Current Rating
  • RS Stock No. 275-0232
  • Mfr. Part No. IELH11-1-62-40.0-AC-01-V
1 Box of 5
HK$5,539.40
Temporarily out of stock
Hager NEN MCB, 4P, 20A Curve B, 240 → 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 144-4700
  • Mfr. Part No. NEN420
Each
HK$2,417.40
Temporarily out of stock
Better World
Schneider Electric, Compact MCCB 4P 63A, Breaking Capacity 70 kA, Clip-On
  • RS Stock No. 178-7826
  • Mfr. Part No. LV426575
Each
HK$5,157.69
In Stock
Lovato 50A Base Mount Fuse Holder for 14 x 51mm Fuse, 1P, 690V ac
  • RS Stock No. 188-1622
  • Mfr. Part No. FB02A1P
Each
HK$152.00
Temporarily out of stock
ABB SU200 M MCB, 1P, 40A Curve C, 277V AC, 48V DC, 15 kA Breaking Capacity
  • RS Stock No. 200-599
  • Mfr. Part No. 2CDS271337R0404
Each
HK$933.40
Temporarily out of stock
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 4P 400A, Breaking Capacity 6 kA, Fixed Mount
  • RS Stock No. 239-858
  • Mfr. Part No. 192281 NZMS3-4-PX400/VAR
Each
HK$39,982.00
In Stock
Better World
ABB System Pro M Compact S200 MCB, 1P, 16A Curve C, 253V AC, 72V DC, 6 kA Breaking Capacity
  • RS Stock No. 225-5988
  • Mfr. Part No. 2CDS251001R0164 S201 C 16A - 6 KA
Each
HK$197.20
Temporarily out of stock
Lovato ModuLo P1MB MCB, 4P, 1A Curve C, 230V AC, 10 kA Breaking Capacity
  • RS Stock No. 825-5942
  • Mfr. Part No. P1MB4PC01
Each
HK$1,161.60
Temporarily out of stock
ABB S303 MCB, 3P, 1.6A Curve K, 415V AC, 125V DC, 100 kA Breaking Capacity
  • RS Stock No. 200-318
  • Mfr. Part No. 2CDS383001R0257
Each
HK$3,910.58
Temporarily out of stock
Eaton NZMH3 Electronic Circuit Breaker 500A 500V , 4 channels , Fixed
  • RS Stock No. 120-644
  • Mfr. Part No. 168894 NZMH3-4-A500/320-SVE
Each
HK$37,621.52
In Stock
Better World
Siemens RCBO, 16A Current Rating, 2P Poles, 30mA Trip Sensitivity, Sentron Range
  • RS Stock No. 225-8810
  • Mfr. Part No. 5SV1316-3KK16
Each
HK$887.70
Temporarily out of stock
Eaton, Eaton Moeller series NZM MCCB Molded Case Circuit Breaker 3P 125A, Breaking Capacity 7.5 kA, Plug In
  • RS Stock No. 230-877
  • Mfr. Part No. 113243 NZMN2-A125-SVE
Each
HK$9,644.83
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