Ano ang isang circuit breaker?

Ano ang circuit breaker?

Paglalarawan ng circuit breaker

Ang circuit breaker ay isang switch device na binubuo ng contact system, arc extinguishing system, operating mechanism, release device, at housing, na maaaring i-close, mag-load, at i-break ang current sa normal at abnormal na kondisyon upang protektahan ang circuit at equipment mula sa overload, short circuit, at iba pang mga pagkakamali.

Pangunahing istraktura

• Contact system

• Arc extinguishing system

• Operating mechanism

• Release device

• Shell

Pamamaraan ng paggana

Kapag nangyari ang short circuit, ang magnetic field na lumilikha ng malaking current (karaniwang 10 hanggang 12 beses) ay nalalampasan ang reaction spring, ang release device ay naghihila ng operating mechanism upang gumana, at ang switch ay ina-trip instantaneously. Kapag overloaded, ang current ay naging mas malaki, ang init ay naging mas matinding, at ang bimetal sheet ay nabago ng baluktot sa isang tiyak na antas upang mapabilis ang gawain ng mekanismo (ang mas malaking current, ang mas maikling oras ng aksyon).

Operasyonal na katangian

• Rated voltage

• Rated current

• Setting range ng trip current para sa overload protection

• Short circuit protection

• Rated short circuit breaking current

Klasipikasyon ng circuit breaker

Low-voltage circuit breaker : may function ng manual switch, at maaaring awtomatikong magsagawa ng voltage loss, undervoltage, overload, at short circuit protection ng mga electrical appliances, maaaring gamitin para sa pagdistribute ng electrical energy, infrequently start asynchronous motors, ang power line at motor protection, kapag sobrang overload o short circuit at undervoltage failures maaaring awtomatikong i-cut off ang circuit.

High-voltage circuit breaker : ang rated voltage ng 3kV pataas ay pangunahing ginagamit upang i-break at i-close ang electrical circuit.

Circuit breaker connection

• Wiring mode behind the board

• Plug-in connection mode

• Drawer type wiring mode

Working condition

• Temperature : upper ambient air temperature +40℃;  Lower limit of ambient air temperature -5℃; The average ambient air temperature for 24h does not exceed +35℃.

• Elevation : The elevation of the installation site does not exceed 2000m.

• Atmospheric conditions : the relative humidity of the atmosphere does not exceed 50% when the ambient air temperature is +40℃; It can have higher relative humidity at lower bottom temperature. The monthly average maximum relative humidity of the wettest month is 90%, while the monthly average minimum temperature of the month is +25 ° C, taking into account the condensation that occurs on the surface of the product due to temperature changes.

• Pollution level : The pollution level is 3.

Development direction

• Bulk

• Intelligentize

• Miniaturization