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

139 of 999+
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 30A, Breaking Capacity 7 kA, Cable Mount, Panel Mount
  • RS Stock No. 148-573
  • Mfr. Part No. 3VA5130-5EC41-0AA0
Each
HK$2,993.90
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 4P 25A, Breaking Capacity 200 kA, Fixed Mount
  • RS Stock No. 270-4514
  • Mfr. Part No. 3VA2125-0KQ42-0AA0
Each
HK$27,142.20
Temporarily out of stock
Schurter Thermal Magnetic Circuit Breaker - Single Pole 48 V dc, 240V ac Voltage Rating, 16A Current Rating
  • RS Stock No. 173-7872
  • Mfr. Part No. 4404.0006
Each (In a Box of 100)
HK$18.825
Temporarily out of stock
Better World
Siemens, Sentron MCCB Molded Case Circuit Breaker 3P 100A, Breaking Capacity 3 kA
  • RS Stock No. 245-282
  • Mfr. Part No. 3VA6210-7JP31-2AA0
Each
HK$20,536.50
Temporarily out of stock
Siemens, SENTRON MCCB 1P 70A, Breaking Capacity 5 kA, Fixed Mount
  • RS Stock No. 147-546
  • Mfr. Part No. 3VA5170-5ED11-0AA0
Each
HK$1,280.40
Temporarily out of stock
Siemens, SENTRON MCCB 3P 200A, Breaking Capacity 65 kA, Fixed Mount
  • RS Stock No. 256-532
  • Mfr. Part No. 3VA5320-6EF31-2AA0
Each
HK$13,422.90
Temporarily out of stock
Siemens, SENTRON MCCB 3P 350A, Breaking Capacity 35 kA, Fixed Mount
  • RS Stock No. 257-435
  • Mfr. Part No. 3VA5335-5EC31-1AA0
Each
HK$11,319.80
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 600A, Breaking Capacity 65 kA, Fixed Mount
  • RS Stock No. 249-386
  • Mfr. Part No. 3VA6460-6HM31-0AA0
Each
HK$24,866.40
Temporarily out of stock
Siemens, SENTRON MCCB 4P 225A, Breaking Capacity 10 kA, Fixed Mount
  • RS Stock No. 147-337
  • Mfr. Part No. 3VA5222-7EC41-2AA0
Each
HK$15,835.40
Temporarily out of stock
Siemens, SENTRON MCCB 4P 100A, Breaking Capacity 10 kA, Fixed Mount
  • RS Stock No. 147-397
  • Mfr. Part No. 3VA5210-6ED41-2AA0
Each
HK$9,526.00
Temporarily out of stock
Siemens, SENTRON MCCB 2P 150A, Breaking Capacity 10 kA, Fixed Mount
  • RS Stock No. 147-441
  • Mfr. Part No. 3VA5215-6ED61-0AA0
Each
HK$7,670.20
Temporarily out of stock
Siemens, SENTRON MCCB 4P 125A, Breaking Capacity 10 kA, Fixed Mount
  • RS Stock No. 147-373
  • Mfr. Part No. 3VA5212-7EF41-0AA0
Each
HK$13,237.40
Temporarily out of stock
Better World
Siemens, SENTRON MCCB 3P 600A, Breaking Capacity 65 kA, Fixed Mount
  • RS Stock No. 249-736
  • Mfr. Part No. 3VA6460-6KQ31-0AA0
Each
HK$32,969.70
Temporarily out of stock
Siemens, SENTRON MCCB 4P 250A, Breaking Capacity 35 kA, Fixed Mount
  • RS Stock No. 256-602
  • Mfr. Part No. 3VA5325-5GF41-0AA0
Each
HK$13,175.50
In Stock
Better World
Siemens Sentron 5SY4 MCB, 2P, 25A Curve D, 400V AC, 10 kA Breaking Capacity
  • RS Stock No. 772-1335
  • Mfr. Part No. 5SY4225-8
Each
HK$703.50
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 1P 45A, Breaking Capacity 18 kA, Cable Mount, Panel Mount
  • RS Stock No. 148-639
  • Mfr. Part No. 3VA5145-5ED11-1AA0
Each
HK$1,243.30
Temporarily out of stock
Siemens, SENTRON MCCB 2P 50A, Breaking Capacity 25 kA, Cable Mount, Panel Mount
  • RS Stock No. 148-671
  • Mfr. Part No. 3VA5150-4ED21-0AA0
Each
HK$2,047.50
Temporarily out of stock
Siemens, SENTRON MCCB 4P 200A, Breaking Capacity 10 kA, Fixed Mount
  • RS Stock No. 147-210
  • Mfr. Part No. 3VA5220-6ED41-0AA0
Each
HK$11,567.20
Temporarily out of stock
Siemens SENTRON 5SY8 MCB, 4P, 50A Curve D, 400V AC, 72V DC, 20 kA Breaking Capacity
  • RS Stock No. 610-361
  • Mfr. Part No. 5SY8450-8BB08
Each
HK$2,037.16
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 40A, Breaking Capacity 25 kA, Cable Mount, Panel Mount
  • RS Stock No. 148-386
  • Mfr. Part No. 3VA5140-6EC31-1AA0
Each
HK$2,845.40
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