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

47266 產品顯示為 Fuses & Circuit Breakers

2360 of 999+
Temporarily out of stock
63A NH Fuse, 63 x 40 x 135mm, 690V ac
  • RS Stock No. 262-770
  • Mfr. Part No. 63NHG1B-690
1 Pack of 3
HK$373.80
Temporarily out of stock
Better World
Siemens, SENTRON MCCB Molded Case Circuit Breaker 3P 400A, Breaking Capacity 35 kA, Fixed Mount
  • RS Stock No. 260-276
  • Mfr. Part No. 3VA6340-5HM31-0AA0
Each
HK$25,229.10
Temporarily out of stock
Eaton 100A NH Fuse, 58 x 30 x 135mm, 500V ac
  • RS Stock No. 248-667
  • Mfr. Part No. 100NHG01BI NH FUSE 100A 500V GL/GG SIZE 01
1 Pack of 3
HK$280.60
Temporarily out of stock
Eaton IZMX Electronic Circuit Breaker 1.25kA , 3 channels , Withdrawable
  • RS Stock No. 132-711
  • Mfr. Part No. 183744 IZMX40H3-V12W-1
Each
HK$72,407.63
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 70A, Breaking Capacity 100 kA, Fixed Mount
  • RS Stock No. 269-540
  • Mfr. Part No. 3VA5270-7EC41-2AA0
Each
HK$13,058.20
Temporarily out of stock
Hager Auxiliary Contact, 2 Contact, 2NO, DIN, MZ9
  • RS Stock No. 251-2077
  • Mfr. Part No. MZ915
Each
HK$7,459.65
In Stock
Mersen 40A NH Fuse, NH00, 690V ac
  • RS Stock No. 448-3364
  • Mfr. Part No. L320147
Each
HK$718.09
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 800A, Breaking Capacity 65 kA, Fixed Mount
  • RS Stock No. 250-153
  • Mfr. Part No. 3VA6580-6JT46-2AA0
Each
HK$89,565.70
Temporarily out of stock
Siemens SENTRON 5SY4 MCB, 4P, 8A, Type A, 400V AC, 60V DC, 20 kA Breaking Capacity
  • RS Stock No. 610-322
  • Mfr. Part No. 5SY4608-5
Each
HK$2,150.34
In Stock
Eaton 750mA T Ceramic Cartridge Fuse, 6.3 x 32mm
  • RS Stock No. 852-7070
  • Mfr. Part No. MDA-3-4-R
Each
HK$64.50
Temporarily out of stock
Siemens, SENTRON MCCB Molded Case Circuit Breaker 4P 600A, Breaking Capacity 100 kA, Fixed Mount
  • RS Stock No. 249-611
  • Mfr. Part No. 3VA6560-7HL42-0AA0
Each
HK$46,038.50
Temporarily out of stock
Eaton xEffect FAZ MCB, 2P, 10A Curve C, 415V AC, 60V DC, 15 kA Breaking Capacity
  • RS Stock No. 241-199
  • Mfr. Part No. 102207 FAZ-C10/2-RT
Each
HK$1,376.50
Temporarily out of stock
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 4P 630A, Breaking Capacity 5 kA, Withdrawable
  • RS Stock No. 243-039
  • Mfr. Part No. 191617 NZMN3-4-VX630/VAR-AVE
Each
HK$45,254.60
Temporarily out of stock
Hager CFB RCD Switch, 63A, 4 Pole, 300mA, Type B, 230 → 400V
  • RS Stock No. 599-755
  • Mfr. Part No. CFB763F
Each
HK$16,549.10
Temporarily out of stock
Hager Hager MMN Circuit Breaker, 4P, 6.3A, Type AC, 415V AC, 25 kA Breaking Capacity
  • RS Stock No. 599-890
  • Mfr. Part No. MMN406
Each
HK$5,278.90
Temporarily out of stock
Eaton, Eaton Moeller series NZM MCCB Molded Case Circuit Breaker 4P 400A, Breaking Capacity 4 kA, Plug In
  • RS Stock No. 231-159
  • Mfr. Part No. 113518 NZMC3-4-A400-AVE
Each
HK$30,013.36
Temporarily out of stock
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 3P 200A, Breaking Capacity 5 kA, Plug In
  • RS Stock No. 230-369
  • Mfr. Part No. 113245 NZMN2-A200-SVE
Each
HK$12,286.22
Temporarily out of stock
Siemens ALPHA Assembly Kit for use with Circuit Breaker
  • RS Stock No. 629-331
  • Mfr. Part No. 8GK4854-8KK05
Each
HK$1,301.52
Temporarily out of stock
Eaton, Eaton Moeller NZM MCCB Molded Case Circuit Breaker 4P 1.1kA, Breaking Capacity 34 kA, Fixed Mount
  • RS Stock No. 127-173
  • Mfr. Part No. 179591 N4-4-1100-S1-PV-NA
Each
HK$67,659.74
Temporarily out of stock
Siemens SENTRON 5SY4 MCB, 4P, 4A, Type A, 400V AC, 60V DC, 35 kA Breaking Capacity
  • RS Stock No. 610-576
  • Mfr. Part No. 5SY4404-5
Each
HK$2,329.53
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