Isikhokelo esiSebenzayo kwi-Molded Case Circuit Breakers

2026-08-25 0 Ndishiyele umyalezo

Yintoni i-MCCB?

I-MCCB-icala elibunjiweyo isaphuli sesekethe- sisixhobo sokukhusela esisezantsi esikhupha ngokuzenzekelayo isiphaluka xa sibona ukugqithiswa okanye iimeko ezimfutshane. Ngokungafaniyo ne-fuse, inokusetwa kwakhona kwaye isetyenziswe kwakhona emva kohambo. Ngaphakathi kwetyala elibunjiweyo, umatshini wokuhamba we-thermal-magnetic uphatha imisebenzi emibini: into eshushu iphendula kumthwalo oqhubekayo, ngelixa i-magnetic element isabela ngoko nangoko kwiimpazamo zesekhethi emfutshane. Isiphumo lukhuseleko oluhambelana nendlela imithwalo yombane yokwenene eziphatha ngayo.

Unokukhetha nini i-MCCB: i-fiddi eziphambili ezingenayo, iiphaneli zokuhanjiswa kwezigaba ezithathu, iisekethe ezinkulu zeemoto, okanye nayiphi na indawo apho umsinga olindelekileyo we-short-circuit current ungaphaya koko kunokuphazamisa i-MCB.

Xa i-MCB yanele: ii-sub-circuits zokugqibela ezinemithwalo ethobekileyo kunye namanqanaba aphantsi eempazamo - iibhodi zokuhlala, ukukhanya kunye neesekethe zesokhethi.

250A three-pole MCCB

Indlela yokukhetha i-MCCB efanelekileyo

Ikalwe ngoku (Ngaphakathi)

1. - fanisa umthwalo oqhubekayo, kwaye uvumele i-headroom ukuqala imisinga yeenjini.

Ukophula amandla (Icu / Ics)

2. - kufuneka ibe phezulu kunokuba inokwenzeka i-short-circuit current kwindawo yofakelo. Inqanaba lesiphoso liphezulu, iphezulu i-Icu oyifunayo.

Iipali

3. - 3P kwiinkqubo zesigaba sesithathu, i-4P apho i-neutral nayo idinga ukuqhawulwa.

Amanqaku ombane

4. - khangela i-voltage yokusebenza elinganisiweyo (Ue), i-voltage ye-insulation (Ui) kunye ne-impulse ukumelana (Uimp) ngokuchasene nenkqubo.

Imigangatho kunye nesiqinisekiso

5. - Ukuthotyelwa kwe-IEC/EN 60947-2 kunye nokumakishwa kwe-CE sisiseko seeprojekthi zamazwe ngamazwe.

Isicelo

6. - ukukhuselwa kwemoto, ukuhanjiswa kwamandla kunye nokufakelwa kwamashishini kunokufuna ukulinganiswa kwefreyimu eyahlukeneyo kunye neempawu zohambo.

Ijongeka njani i-250A MCCB echazwe kakuhle:

Ukwenza le khonkrithi, qwalasela i-DAM3-250 evela kwi-C·DADA Electric - i-250A ye-MCCB ye-pole ezintathu ebonisa ukuba ukhangele ntoni kule klasi yesixhobo:

3P uqwalaselo

● kunye ne-250A yangoku (In), efanelekileyo kwiibhodi zokusasazwa kwezigaba ezintathu

Amazinga ombane:

● 690V~; Ue AC400/415V, Ui 750V, Uimp 8kV

Ukophula amandla ukuya kuthi ga kwi-50kA

● — Icu ye-18 / 25 / 36 / 50 kA ngapha kwe-B / C / N / S ezahlukeneyo, ukuze abafakeli bathelekise amanqanaba empazamo kwiindawo ezahlukeneyo zenethiwekhi

IEC / EN 60947-2 kunye ne-GB 14048.2 ukuthotyelwa

● I-CE iphawulwe, kunye ne-ON / OFF ecacileyo yokuguqula isiphatho kwimo yokusebenza ebonakalayo

● Yakhelwe ukuhanjiswa kwamandla, ukukhuselwa kweemoto kunye nezicelo zemizi-mveliso

Ingqiqo emva kwesi nkcazo: i-250A, isakhelo se-3-pole kunye ne-50kA yeklasi yokuphulwa kwamandla igubungela uninzi lweemfuno zomakhi wepaneli kunye neekontraka - ukusuka kwiibhodi eziphambili zokusasaza ukuya kwiisekethe ze-motor feeder - ngelixa iintlobo ezininzi ze-Icu zikuvumela ukuba ube neendleko zobukhulu obuchanekileyo ngokuchasene namanqanaba eempazamo.

Ingcebiso yokhetho

● Kwiisekethe zokugqibela ukuya kuthi ga kwi- ~ 125A enamanqanaba asezantsi eempazamo, i-MCB lukhetho loqoqosho.

● Kusasazo oluphambili, ukhuseleko lwemoto kunye nesixhobo sokutshintsha kweshishini, khetha i-MCCB enomthamo wokuqhawuka odlula umsinga wofakelo olulindelekileyo wesekethe emfutshane.

● Xa ungathandabuzeki, ubukhulu beklasi enye phezulu kwi-breaking capacity: umahluko weendleko umncinci, ngelixa umda wokukhusela unokuba ngumahluko phakathi kwempazamo encinci kunye nokuphuma okukhulu.

Imibuzo ebuzwa qho

Umbuzo: Yintoni i-MCCB?

A: Aicala elibunjiweyo isaphuli sesekethesisixhobo sokukhusela esisezantsi se-low-voltage esiqhawula isiphaluka kwi-overload okanye i-short-circuit, eyenzelwe imisinga ephezulu kunye namanqanaba esiphoso kune-breaker circuit miniature.

Q: Ithetha ukuthini i-Icu kwi-MCCB?

A: I-Icu yeyona ndlela imfutshane yokuqhawula amandla - eyona fault yangoku i-breaker inokuphazamisa. I-Ics yinkonzo yokuqhawula inkonzo, inqanaba elinokuthi liphazamise ngokuphindaphindiweyo kwaye lihlale lisebenza.

Umbuzo: Ndiwukhetha njani amandla okuqhawuka kwi-MCCB yam?

A: Khetha umlinganiselo we-Icu ophezulu kunomjelo olindelekileyo wesekethe emfutshane kwindawo yofakelo. Iibhodi zokusasaza ezinomthamo ophezulu we-transformer okanye i-feeder zemizi-mveliso ezide zifuna izixhobo zeklasi ze-36-50kA.

Q: Yintoni na i-DAM3-250 MCCB?

A: I-DAM3-250 yi-250A i-pali ye-3-pole-molded case circuit breaker evela kwi-C·DADA Electric, ihlelwe ukuya kwi-690V kunye nokuphulwa kwamandla ukuya kwi-50kA, ukuhanjiswa kwamandla, ukukhuselwa kweemoto kunye nezicelo zoshishino.