What is the difference between MCCB and ACB? - Quisure

From the appearance, the size of moulded case circuit breaker is different from that of and air circuit breaker. The size and volume of ACB are ... HomeBlogFAQWhatisthedifferencebetweenMCCBandACB?WhatisthedifferencebetweenMCCBandACB?From:Quisure2020-10-23Mouldedcasecircuitbreakerandaircircuitbreakerareverycommonproducts,butmanypeopledonotunderstandthedifferencebetweenthem,soitiseasytoconfusetheminpracticalapplication.Aircircuitbreakerhaslargecapacity,highlimitbreakingcapacity,goodshort-timewithstandabilityandgoodstability,butitisexpensive.Itismostlyusedformainswitchoflow-voltagedistributionsystem,trunklinewithlargeloadandprotectionoflargemotor.Comparedwithaircircuitbreaker,mouldedcasecircuitbreakerhastheadvantagesofsmallvolume,goodcontactprotection,convenientinstallationandlowprice,butithassmallcapacityandpoorshort-timetolerance,soitissuitableforbranchprotectionswitch.MoldedcasecircuitbreakerMoldedcasecircuitbreakers(MCCBs)automaticallycutoffcurrentwhenthecurrentexceedsthetripsetting.Plastichousingreferstothehousingofadeviceusingaplasticinsulatortoisolatebetweenconductorsandthegroundedmetalpart.Moldedcasecircuitbreakersusuallycontainthermalmagnetictripunits,whilelargemouldedcasecircuitbreakersareequippedwithsolidstatetripsensors.Duetotheverycompactstructure,themouldedcasecircuitbreakercanhardlybeserviced.NaderMoldedcasecircuitbreaker (NDM2-250Series)AircircuitbreakerAircircuitbreaker(ACB)isamechanicalswitchingdevicewhichcanturnon,carryandbreakcurrentundernormalcircuitconditions,andalsoturnonandcarrycertaintimeandbreakcurrentunderspecifiedabnormalcircuitconditions.Aircircuitbreakersareusedtodistributeelectricenergyandprotectlinesandpowersupplyequipmentfromoverloads,undervoltages,shortcircuits,etc.NaderAircircuitbreaker(NDW1-1600Series)Aircircuitbreakersgenerallyhaveasteelframe,andallpartsareinstalledintheframe.Ithasalargecapacity,canbeinstalledwithmultiplefunctionsoftrippingdevicesandmoreauxiliarycontacts,hasahighersegmentationcapacityandthermalstability,soitisoftenusedinplacesthatrequirehighbreakingcapacityandselectiveprotection.DifferencebetweenmouldedcasecircuitbreakerandaircircuitbreakerTheappearanceandinstallationsizearedifferentFromtheappearance,thesizeofmouldedcasecircuitbreakerisdifferentfromthatofandaircircuitbreaker.ThesizeandvolumeofACBarelarger,whilethatofMCCBisrelativelysmall.Moreover,thecurrentlevelandbreakingcapacityofaircircuitbreakeraregreaterthanthoseofmoldedcasecircuitbreaker.TheprotectionfunctionofthereleaseisdifferentTheintelligentreleaseofaircircuitbreakerhasprotectionfunction,measurementfunction,auxiliaryfunction,specialfunctionandcommunicationfunction.Protectionfunctions:longtimedelayprotection,shorttimedelayprotection,instantaneousprotection,MCRprotection,groundingprotection,lowvoltageprotection/alarm,over-voltageprotection/alarm,voltageunbalancephaselossprotection/alarm,phasesequenceprotection,low-frequencyprotection,high-frequencyprotection,reversepowerprotection,voltageharmonicalarmandcurrentharmonicalarm.Measurementfunction:currentmeasurement,voltagemeasurement,powermeasurement,frequencymeasurement,electricenergymeasurement,harmonicmeasurement.Auxiliaryfunctions:prealarm,selfdiagnosisfunction,faulthistoryrecordfunctionandtestfunction.Specialfunctions:loadmonitoring,regionaljointcontrol,highandlowtemperaturerange.Communicationfunction:communicationprotocolfunction.Thereleaseofmouldedcasecircuitbreakermainlyhasthefunctionsoflongtimedelayprotection,shorttimedelayprotection(i.e.overloadprotection)andinstantaneousprotection(i.e.shortcircuitprotection).Itcanbeseenfromherethattheprotectionfunctionofaircircuitbreakerismorepowerfulthanthatofmouldedcasecircuitbreaker.ThescopeofapplicationisdifferentTheratedcurrentrangeofaircircuitbreakerisusually400-6300A,whichismainlyusedindistributionnetworktodistributeelectricenergy,protectlinesandpowerequipmentfromoverload,undervoltage,shortcircuit,single-phasegroundingandotherfaults.Theratedcurrentrangeofmouldedcasecircuitbreakerisusually10-800A,whichisusedtoprovideprotectionforlinesandequipmentincaseofoverload,shortcircuitandundervoltageoflinesandequipmentindistributionlines.Itcanalsoprovideoverload,shortcircuit,andundervoltageprotectionforsceneswherethemotorisnotfrequentlystarted.Theprimarydistributionequipment,collectivelyreferredtoasthepowerdistributioncenter,isinstalledinthesubstationoftheenterprisetodistributeelectricenergytothelowerleveldistributionequipmentindifferentlocations.Thislevelofequipmentisclosetothestep-downtransformer,sotherequirementsforelectricalparametersarehigh,andtheoutputcircuitcapacityisalsolarge.Generally,inthemaindistributioncabinet,themaincomponentistheaircircuitbreaker.Secondarypowerdistributionequipmentisthegeneralnameofpowerdistributioncabinetandmotorcontrolcenter.Thepowerdistributioncabinetisusedinthesituationwheretheloadisdispersedandthecircuitisless;themotorcontrolcenterisusedfortheoccasionwheretheloadisconcentratedandthecircuitismore.Theydistributetheelectricalenergyofacircuitoftheupperpowerdistributionequipmenttothenearestload.Thisclassofequipmentshouldprovideprotection,monitoringandcontroloftheload.Thecircuitbreakerscommonlyusedaremouldedcasecircuitbreaker,microbreakswitchanddualpowersupplyproducts.DifferenttypesofuseMouldedcasecircuitbreakersareusuallyclassA.inthecaseofshort-circuit,theselectiveprotectionisnotshort-timedelay,sothereisnoshort-timewithstandcurrent(ICW)value.TheaircircuitbreakerisusuallyclassifiedasclassB.Incaseofshortcircuit,theselectiveprotectionhasartificialshorttimedelay(adjustable),soithasshort-timewithstandcurrent(ICW)value.Index contentAir circuit breakerMoulded case circuit breakerRated voltageHigher(Up to 1140V)Lower(Below 660V)Rated currentGenerally 200 ~ 6300AMost of them are below 600ASelectivityWith short time delay, it can meet the requirements of selective protectionMost of them have no short time delay and can not meet the requirements of selective protectionShort circuit breaking capacityHigherLowerRelease settingVarious release devices can be installed to meet different protection requirementsMost of them only have over-current, voltage loss and shunt excitation, and only one of them can be selectedScope of applicationSuitable for main switchSuitable for branch switchOperation modeThere are many changes, such as handle, lever electromagnet and motor operationLess change, mostly handle, also with motor drive mechanismContact protectionPoorGoodMaintenanceMore convenientInconvenient, most of them don't consider maintenanceInstallation modeSuitable for installation in switch cabinet. There are products with drawer structureIt can be installed separately or in the switch cabinetIsolation performanceBetterWorseShort time withstand currentLargerSmallerArcing distanceLargerSmallerDimensionsLargerSmallerPriceHigherLowerPrev:FaultdiagnosisandmaintenanceofaircircuitbreakerNext:Whatisanaircircuitbreaker?FindmoreproductsinChinaImportingfromChina,One-stoppurchasereplaceastepbysteplearnguide.YourEmail:Sub:Remaining:500Needtechnicalsupport?SubmitRFQRelatedarticlesWhatIsaCircuitBreakerCircuitbreakerreferstoaswitchingdevicethatcanclose,carryandbreakcurrentundernormalcircuitconditionsandcanclose,carryandbreak...WhatisaResidualCurrentCircuitBreaker?Residualcurrentcircuitbreaker(RCCB)isaswitchthatcanactautomaticallywhentheleakagecurrentinthecircuitexceedsapredeterminedvalue...WhatisaBuzzer?Buzzerisakindofvoicedevicethatconvertsaudiomodelintosoundsignal.Itismainlyusedtopromptoralarm.Accordingtodifferentdesign...FaultdiagnosisandmaintenanceofaircircuitbreakerTherearemanyaircircuitbreakersinthedistributionequipmentofhigh-risebuildings,whicharegenerallyusedaslow-voltagemainswitchor...Whatisanaircircuitbreaker?Aircircuitbreaker(ACB)isamechanicalswitchingdevicewhichcanturnon,carryandbreakcurrentundernormalcircuitconditions,andalsoturn...Whatisamoldedcasecircuitbreaker?Moldedcasecircuitbreakers(MCCBs)automaticallycutoffcurrentwhenthecurrentexceedsthetripsetting.Plastichousingreferstothehousing...Whatistheworkingprincipleofthebuzzer?Thebuzzerisasoundingdevicethatcanconvertaudiosignalsintosoundsignals.ItisusuallypoweredbyDCvoltage.Itismainlydividedinto...WhatisthedifferencebetweenMCBandRCCB?Whatarethesimilaritiesanddifferencesbetweenminiaturecircuitbreaker(MCB)andresidualcurrentcircuitbreaker(RCCB)?PopularArticlesMore 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