NM8, NM8S - Chint
Moulded Case Circuit BreakersNM8, NM8S3. Type designation4. Product overviewN M 8 － / / / NM8 Moulded Case Circuit BreakerApplication codeBlank: for power distribution;NM8, NM8SMoulded Case Circuit Breaker1. General1.1 Certificates: CE, DNV, KEMA, ESC, UKrSEPRO, GOST, RCC;1.2 Electric ratings: AC50/60Hz, AC220V 690VDC250V 500V, 16A 1250A;1.3 Standard: IEC/EN 60947-2.2. Operation conditions2.1 Temperature: -5 40 ; the average value within24h shall not exceed 35 ; for the circuit breakerwith thermo-magnetic release, 40 is set to be thestandard temperature for ratings. Special utilization,please refer to coefficients indicated on page 21 for;temperature compensation correction;2.2 Altitude: 2000m;;2.3 Pollution grade: Grade 3;;2.4 Air conditions::At mounting site, relative humidity not exceed 50%at the max temperature of 40 , higher relativehumidity is allowable under lower temperature.For example, RH could be 90% at 20 , specialmeasures should be taken to occurrence of dews.M: for motor protectionNumber of poles: 2: 2-pole3: 3-pole4: 4-pole4A: Without current release components,N-pole is always at making status4B: Without current release components,N-pole makes with other three poles(N-pole first makesthen breaks)4C: With current release components,N-pole makes and breaks with otherthree poles, N-pole first makes thenbreaks, N-pole operating value is 1.0Inof other three poles4D: With current release components,N-pole is always at making status,operating current is 1.0In4E: With current release components,N-pole makes and breaks with otherthree poles, N-pole operating value is0.5In of other three poles4F: With current release components,N-pole is alwaysat making status; N-pole operatingvalue is 0.5In of other three polesRated current :125: 16, 20, 25, 32, 40, 50, 63, 80, 100, 125250: 100, 125, 160,180, 200, 225, 250400: 250, 315, 350, 400630: 250, 315, 350, 400, 500, 630 (forthermo-magnetic breaker, the rated operationalcurrent be up to 500A)800: 630, 700, 8001250: 630, 700, 800, 1000, 1250Breaking capacity code:S: Standard type; (current limiting technology utilised)H: Higher type; (current limiting technology utilised)R: Current limiting type (current limiting technologyutilised)1Body2Thermo magnetic release3Electronic release4Plug-in base5Rotary manual operating handle6Motor driven operating mechanism7Under-voltage release8Shunt release9Alarm contact10Auxiliary contact11Front connection plate141510189481671812Rear connection plate13Locking system(padlock)14Short terminal cover15Extended terminal cover16DIN rail adaptor17Cage clamp terminal18Mechanical interlock133121211517Frame size rated current: 125, 250, 400,630, 800, 1250Release type code:Blank: thermal-magnetic release;S: Electronic release;M: Magnetic onlyDesign sequence numberMCCBCompany codeDNV171717146515501 02 03 04
Moulded Case Circuit BreakersNM8, NM8S5. Technical data5. 1 ParametersNM8 circuit breaker Thermal-magnetic typeNM8-125Frame 14 FramesElectric characteristics as per IEC 60947-2 and EN60947-2InRated current(A)Rated insulation voltage(V)Rated impulse withstand voltage (kV)Rated operational voltage (V)UeNM8-250NM8-400NM8-630Frame 2NM8-800NM8-1250100, 125, 160, 180, 200, 225, 250250, 315, 350, 400250, 315, 350, 400, 500630, 700, 800630, 700, 800, 1000, 1250Ui750750750750750750Rated insulation voltageUimpAC 50/60Hz869086908690869086908690Rated impulse withstand voltage (kV)500500500500500500Number of poles234234434334(V)Rated operational voltage (V)3NM8S-400NM8S-800NM8S-630①NM8S-1250Frame 2Frame 340, 50, 63, 80, 100, 125100, 125, 160, 180, 200, 225, 250250, 315, 350, 400250, 315, 350, 400, 500, 630630, 700, 800630, 700, 800, 100035Ue 600V2030303535Ue 600V3030303535Ue 440V1030303535Ue 600V2030303535Ue 600V3030303535Ue 440V1030306060Ue 600V2030306060Ue 600V303030100100Ue 690V501301007070Note: when voltage is 500V, extended terminal cover should be mounted23White or colored metal plateInsulation plate or insulationconnection terminal
Moulded Case Circuit BreakersNM8, NM8S8.5 Modes of connection8.5.1 Cable connection plug and Copper busbara. Screw is used to connect with copper (aluminum) cableconnection plug or copper busbarSize of connection screwNM8-125: M6NM8S-125、NM8-250、NM8S-250：M8NM8-400, 630、NM8S-400, 630：M10NM8-800, 1250、NM8S-800, 1250：M10φφ32φφDDDLLDCopper cableconnection plugAluminum cableconnection plugDimensionLLCopper busbarCopper busbar , 630NM8-800, 1250NM8S-400, 630NM8S-800, 125030354570L(mm) 15 25 32 50D(mm) 7 10 16 16φ(mm) 6 8 10 11Distance between different poles(mm)b. With front connection and use screw to connectwith copper (aluminum) cable connection plate or copper busbarSize of connection screwNM8-125: M6NM8S-125, NM8-250、NM8S-250: M8NM8-400, 630, NM8S-400, 630: M12NM8-800, 1250, NM8S-800, 1250: M10Front connection plateFront connection plateφφ32φφDLLAluminum cableconnection plugDDDCopper cableconnection plugLCopperbusbarLCopper busbar[NM8(S)-1250] 24
Moulded Case Circuit BreakersNM8, NM8SNM8-125NM8S-125NM8-250NM8S-250303552.5L(mm) 15 25D(mm) 7 10φ(mm) 6 8DimensionDistance between different poles(mm)NM8-400, 630NM8-800, 1250NM8S-400, 630NM8S-800, 12507070 40 60 50 20 20 16 12 12 118.5.2 Connection of bare cableLCopper or aluminum 5 702.5 185L(mm)2CSA(mm )NM8-400, 630NM8S-400, 630DimensionNumber of cable124L(mm)2630, 603035 37035 18535 125CSA(mm2)8.5.4 Plug-in type connectionTwo modes of front and rear connection are available;for rear connection, upper limit or lower limit connectionis used.Plug-in type8.5.3 Rear connectionFor rear connection, cable connection plug should beused for connection with copper busbar.Rear connectionFront connectionLower limit connectionfor rear connectionHorizontalUpper limit connectionfor rear connectionVertical8.5.5 Standard CSA of copper cableor busbar used for connectionRated current(A)Cross sectionarea (mm2)25Copper cableCopper busbar 16 20 25 32 40 50 63 80 100 125 160 200 250 315 350400500630700800352402 1502 1852 2402 240--2 50 52 60 52 70 52.5 2.5 4.0 6.0 10 10 16 25---------50-70-95-120 185 185----2 30 52 40 52 50 510001250
Moulded Case Circuit BreakersNM8, NM8S8.5.6 Usual cross sections for conductors according intensityCopper conductorsIn(A)Copper bar22Cross Section Area (mm )Dimensions Area (mm 15185—400240—5002 1502 30 56302 1852 40 58002 2402 50 51000—2 60 51250—2 80 58.6 Overall and Mounting Dimensions8.6.1 Overall and mounting dimensions of fixed type for W0Plate mount3P4PK1K2 φd 4 φdW0W0W2W1Bar mountK23PKDIN rail mount[NM8(S)-125,250]4PK2K1KG1G1G2G235K2 φd4 φd 26
Moulded Case Circuit BreakersNM8, 400, 630/NM8S-400, 6302554749511316822.5NM8-800, 1250/NM8S-800, 0100701401208.6.2 Overall and mounting dimensions of fixed type for rear connectionPlate mount3Pφd13P4PK1K6 φDK2K8 φD4Pφd1H4W0W0G3G1G4G24 φdH3H4H3W02 φdW0W0W0 W0W0 W0 54590100200113.5227613328.6.3 Overall and mounting dimension of plug-in typePlate mount4P3PW0NMW0L4L6W0TTL3L5T4W0 W0W1W0W0W2H5H6H7W0Bar mountPlate mount M3P4PK14 φd2K24 φd24P3PKKK8K7K6G10G6G9G7G5G8UK6K3K427 K3K52 φd24 φd2
Moulded Case Circuit BreakersNM8, NM8SPlate mount N front connectionInsulation barrier must be mountedbetween mounting plate and breaker basePlate mount N rear connectionInsulation barrier must be mountedbetween mounting plate and breaker baseLower limit3P4P2 φd2KK24P2 φd2K14 φd2KK24 φd2KG13G11G11G12G12KG14K13P6 φD2W03PUpper limitK1W0W0W0K24PK4 φd2K8 φD2W0G16G11G15G122 φd2W0W0W0W0W06 φD28 43570NM8-400, 630/NM8S-400, 5.2170.432.5656813654.510970.5141626 1556112279158630 32NM8-400, 630/NM8S-400, 630140137 27415030075150125250100200126252633 32d2 D2U8.6.4 Flush type (for fixed or plug-in type)Hole AP2Hole BHole 56.5113NM8-400, 630/NM8S-400, 63010911426.55371.5143188-41.5116108205 28
Moulded Case Circuit BreakersNM8, NM8S9. Accessories9.1 Inner accessories9.1.1 Shunt releaseUs 70 110%In, circuit breaker reliably operatesLong-time electrification is prohibitedTime of response: pulsive type 20ms, 60ms9.1.2 Under-voltage releaseUs 35 70%Un, circuit breaker reliably breaksUs 85%Un, circuit breaker reliably closesUs 35%Un, prevent circuit breaker from makingNote: With under-voltage release, Us 85%Un,circuit breaker normally makes and breaksShunt release Wiring diagram Under-voltage release Wiring diagram UC1C2D1D29.1.3 Auxiliary contactFunction: Indication of contacting statusWiring diagramCircuit breaker is atF12breaking statusF14Circuit breaker is atF12making Breakingcircuit9.1.4 Alarm contactFunction: indication of reason for circuit breaker releasing;* Over-load* Short-circuit* Grounding fault* Operation of under-voltage releasing or free trippingWhen circuit breaker normally makes and breaks,alarm contact not operates.After free tripping(or tripping due to failure),alarm contact operates and after the circuit breaker againnormally operates, alarm contact recovers original status.Wiring diagramCircuit breaker is atB12breaking or making statusB14Circuit breaker is at freeB12release (or alarming)statusB1429 B11B11B11Power supplyQFB14B12
Moulded Case Circuit BreakersNM8, NM8SONLeftRightMounting and wiring modeHandleAccessoryCodeOFFNM8-125, 250NM8S-125, 250NM8-400, 630NM8S-400, 630NM8-800, 1250NM8S-800, 12503P, 4P3P, 4P3P, 4PNo accessoryAlarm contactShunt releaseAuxiliary contactUnder-voltage releaseShunt releaseAuxiliary contactTwo groups ofauxiliary contactAuxiliary contactALSM: AC220V, SQ: AC380VSB: DC24VAXUM: AC220VUQ: AC380VSM: AC220V, SQ: AC380V, SB: DC24VAXAX, AXAXUnder-voltage releaseUM: AC220V, UQ: AC380VShunt releaseSM: AC220V, SQ: AC380V, SB: DC24VAlarm contactALAuxiliary contactAXAlarm contactALUnder-voltage releaseAlarm contactShunt releaseALSM:SM: Auxiliary contact, alarmAX,AX,ALALTwo groups ofAX, AXauxiliary contactALAX, ALAlarm contact248348Auxiliary contact, alarm contactUnder-voltage release(UM: AC220V, UQ: AC380V) -Shunt release -Under-voltage release -Auxiliary contact -Alarm contactNote: 1: For NM8-125, 250, 400, 630, NM8S-125, 250, 400, 630, under-voltage and shunt release couldn't be simultaneouslyequipped on one breaker.2: For NM8-800, 1250, NM8S-800, 1250, at most three auxiliary contacts could be equipped, under-voltage and shunt releasecould be simultaneously equipped on one breaker, in addition, their positions could be exchanged. 30
Moulded Case Circuit BreakersNM8, NM8S9.2 External accessories9.2.1 Economic extended rotary handleProtection degree: IP30Functions: Isolation function indication;0(breaking), 1(making)and free tripping indication;At "OFF" status, the breaker can be fitted with 1-3padlocks with a diameter of 5-8mm(by customer),This prevents the door of switchgear being openedunwantedly.circuit breakerP7YP6X24DMIN 50mm(mm)NM8-125NM8S-125, (S)-1250Handle mounting 11231 200112150OFFONChains2 φ5.54 φ4.2Chains45 φ36φ16 200
Moulded Case Circuit BreakersNM8, NM8S9.2.2 Direct rotary handleProtection degree：IP40Functions:Reliable insulation;Isolation function indication;0(breaking), 1(making) and free tripping indication;Realize free tripping of circuit breaker;At "OFF" status, the breaker can be fitted with 1-3padlocks with a diameter of5 8mm (by customer).Direct rotary handleW44PL7L8L93PTT44W3W1W3W2H8H9Front boring(fixed or plug-in circuit breaker)R7C5C6R6P3 32
Moulded Case Circuit BreakersNM8, NM8S9.2.3 Extended rotary handleProtection degree: IP55Functions:Reliable insulation;Isolation function indication;0(breaking), 1(making) and free tripping indication;When the door is open, the release can be setand the breaker will not make;At "OFF" status, the breaker can be fitted with 1 3padlocks with a diameter of 5 8mm (by customer).Then door of the switchgear can be opened.Front boring(fixed or plug-in circuit breaker)(mm)45 YW4L9φ50X1718GGP42 3 P4 175 600 175 600 175 600 175 .512436726212470.51243672
Moulded Case Circuit BreakersNM8, NM8S9.2.4 Motor-driven mechanismProtection degree: IP40Functions:Reliable insulation;Isolation function indication;0(breaking), 1(making) and free tripping indication;Free releasing of circuit breaker;Making and breaking the breaker manually or automaticallyManual operationTurn "manual/auto" switch to "auto" position and then turnthe handle to make and break the breaker.Automatic operation:Turn "manual/auto" switch to "manual" position and thenpush the button to make and break the breaker remotely.The make/break operation is carried out via pulse orself-retaining type signal control.Operational range: 85%Un 110%Un.NM8 circuit breakerRated control voltageElectrical lifeOperational currentPower consumption10,000 operations 0.5 A14W14VA100-240V ACNM8-125100-220V DCNM8S-125100-240V AC14W24V DCNM8-250100-220V DCNM8S-25024V DCNM8-400NM8S-400NM8S-63014W 0.5 A14W230V AC35VA110V AC35VA220V DCNM8-63014VA10,000 operations5,000 operations35W 2 A110V DC35W24V DC35WNM8-800NM8S-800230V/400V ACNM8-12503,000 operations200W 7.5 ANM8S-1250H113P4PW5W5L11L10H10Operatinghandle 34
Moulded Case Circuit BreakersNM8, NM8SWiring diagramFront boring(fixed or plug-in circuit 46.59314417.3120NM8S-125, NM8-250, NM8S-250907717511714.546.59315514.5120NM8-400, NM8S-400107115250174196412822519177NM8-630, NM8S-630107115250174196412822519177NM8-800, NM8S-800----------NM8-1250, NM8S-1250----------9.3 Locking systemLocking the breaker at status of making or breaking.The system can be fitted with 1 3 padlockswith a diameter of 5 8mm (by customer).9.4 Terminal coverProtection degree: IP40Protect from being contacted with main circuit.Selection of terminal cover:Fixed breaker (front connection): Long terminal cover;Fixed breaker (rear connection): Short terminal cover;Plug-in breaker: short terminal cover;When voltage is 500V, terminal cover selected for definite connection modeLocking systemLong terminal coverShort terminal cover10. Complementary technical information10.1 Isolation functionIsolation functions of all the circuit breakers as perIEC60947/EN60947-2; Isolating position of contactors is at 0(OFF) status. The operating handle will correctly indicate thestatus of 0(OFF), only if the contactor breaks.Padlocks could be mounted after the contacts breaks;Operation of isolation functions will realize following points:. Contacts operation correctly indicates:operating reliability of interior mechanism;; No residual current;. Higher impulse withstands voltage for terminals.at the power supply side and on-load side.10.2 Current-limiting.10.2.1 Current-limiting capacityThe current-limiting capacity of a circuit breaker is itsaptitude to limit short-circuits current. By occurring ofshort-circuit, the breaker is able to limit I2t in time so asto protect circuits and switchgear at downstream.The exceptional limiting capacity of NM8 series is due to therotating double-break technique, which is characterized by veryrapid natural repulsion of contacts and the appearance of twoarc voltages in series with a very steep wave front.35 .;a. Exceptional current-limiting capacity is able to greatly reducepower caused by fault current so as to enhance breaking;capacity of breaker to Ics 100%Icu;b .The capacity has greatly released damages, which short-circuit;current lay to apparatus;c .The capacity has greatly lowered temperature-rise so as to;lengthen service life of the cable;d. The capacity has greatly reduced power so as to lessen;distortion of contacts and bus bar;e. The capacity has greatly decreased interruptions to apparatusnearby.
Moulded Case Circuit BreakersNM8, NM8S10.2.2 Current-limiting curvesThe current-limiting capacity of a circuit breaker is expressedby two curves which are the prospective current and theactual short-circuit current.Thermal stress (A2S), i.e. the energy dissipated by theshort-circuit current in a conductor with a resistance of 1Ω.The table below indicates the maximum permissiblethermal stresses for cables depending on their insulation,conductor (Cu or Al) and cross section area (CSA).22CSA values are given in mm and thermal stresses in A S.IPro spec tivecur rent peakAct ualcur rent peakt21.52.54610162535Cu K 1152.97 1048.26 1042.12 1054.76 1051.32 1063.40 1068.26 1061.62 107Al K 761.30 10463.16 1067.08 103.86 10442.10 104Al K 871.70 104Cu K 1434.60 1041.28 1043.27 1047.36 1044444CSA(mm )PVCCu K 131ButylEPRAl K 942Cu K 115Butyl4.73 1049.26 1052.75 1041.21 1041.41 102.08 102.72 103.18 1070951.19 1042.83 1048.41 1054.29 104Al K 871.89 1043.71 104445.11 1042.21 101.00 104.33 1045.78 106.18 106.48 1041.44 105443.31 10Cu K 131Al K 94455.52 10Al K 76Cu K 143EPR1.07 1050CSA(mm )PVC1.99 103.61 1041.72 1047.57 1041.07 104.73 1049.27 1042.04 1045.23 1041.28 1042.51 104445.52 1041.08 108.84 105.21 108.32 1051.55 1042.47 10441.85 1047.97 1044.39 101.94 102.26 1018515056.83 10741.90 1051.48 104120561.09 1042.94 1041.27 1042.98 1061.30 1063.86 10441.70 1044.60 1041.99 1042404.53 1061.98 1065.87 1047.62 10663.33 109.88 1042.59 1044.36 107.00 10441.18 1043.02 1045.09 104K is quoted from GB-50054 code for design of low voltage electrical installations.Example:a.What is the actual current when a prospective short-circuit current of 125kA rms (peak value 275kA)comes through the current-limiting operation circuit breaker at upstream of NM8-125RAnswer: the peak value 23kA; (for details, refer to current-limiting curves)b.Is a Cu/PVC cable with a CSA of 10mm2 adequately protected by a NM8-125S circuit breaker62Answer: the table above indicates that the permissible thermal stress is 1.32 10 A Sat the point where a NM8-125S (Icu 50kA) is installed,and the short-circuit current is limited within the range of 1.32 106 A2S, therefore the cable could be protected.22I t CurveA s curve2Ip [kA]380V 415V AC200NM8(S)-1250(630A 1250A)2I t [A s]380V 415V AC910532100NM8(S)-1250(630A 1250A)8807060NM8(S)-800(630A 800A)1053250NM8(S)-800(630A 800A)NM8(S)-630(250A 630A)40NM8(S)-400(250A 400A)30NM8(S)-250(100A 250A)NM8-125(40A 125A)20NM8-125(16A 32A)1075NM8(S)-630(250A 630A)3210NM8(S)-400(250A 400A)6NM8(S)-250(100A 250A)5NM8-125(40A 125A)3210754310NM8-125(16A 32A)5533 4 5 7 1020 3050 70 100200 30023 45 7Irms [kA]1020 30 50 70 100200 300Irms [kA] 36
Moulded Case Circuit BreakersNM8, NM8SI2 t CurveIp [kA]A2s curve690V AC2690V ACIt5081054032NM8(S)-1250(630A 1250A)NM8(S)-800(630A 800A)1030NM8(S)-1250(630A 1250A)7NM8(S)-800(630A 800A)5NM8(S)-630(250A 630A)32NM8(S)-400(250A 400A)2010NM8(S)-630(250A 630A)NM8(S)-400(250A 400A)6NM8(S)-250(100A 250A)5NM8(S)-250(100A 250A)NM8-125(40A 125A)32NM8-125(16A 32A)NM8-125(40A 125A)10NM8-125(16A 32A)105755433234571020303 45 71020 30 50 70 100200 300Irms [kA]50Irms [kA]10.3 Power loss per poleResistance/ powerloss 2.8801.3/8.30.7/4.51000.85/8.50.5/51250.71/11.1 0.04/4012500.04/62.50.04/62.50.13/51.663037
Moulded Case Circuit BreakersNM8, NM8S10.4 Influences which altitude lay to tripping characteristicsTo tripping characteristics of circuit breaker, it is no obvious influence, when the altitude does not exceed 2000m.Once the altitude exceeds the level of 2000m, factors of dielectric stress lowering and cooled air should betaken into consideration.Altitude (m)2000300040005000Dielectric stress (V)3000250021001800Max. operational voltage (V)690550480420Ratings at 40 (A)1In0.96In0.93In0.9In10.5 Cascading.Definition of CascadingCurrent-limiting technique has been adopted for cascadingto install downstream circuit breaker with lower breakingcapacity (cheaper circuit breakers) at the given point of circuit,and upstream NM8(S) circuit breaker operates to limit shortcircuit current. Under the operation of cascadingnetwork, circuit breaker with lower breaking capacitycompared with prospective short-circuit current at the givenpoint could operate under normal short-circuit status.As the short-circuit current will be limited by upstreamcircuit breaker with current-limiting operation, cascadingnetwork is applicable to all the power distribution apparatusprotection at downstream.In addition, cascading operation is not restricted to operationof two switches in serial, but is applicable in various electricnetworks, as well.Application of cascading.Through the application of cascading, connected apparatusescould be installed in different switchgears to realize normaloperation. Therefore, cascading, in common, refers to variouscombination of circuit breakers installed at the given point ofwhich the breaking capacity is lower than prospective shortcircuit current. And breaking capacity of upstream circuitbreakers should be equal to or higher than prospective shortcircuit current at the installed point to protect apparatus atdownstream. Cascading application is in conformity withIEC60947-2 standards. 38
Moulded Case Circuit BreakersNM8, NM8SCascading (220/230/240V)Upstream: NM8-125 1250Downstream: DZ47, eB, UB, DZ158, DZ267, NB1, NBH8, NM8 (S)-125 1250UpstreamBreaking capacity(kA 250S85NM8-250H100NM8-250R150Breaking capacity (kA rms)DZ267308080304040DZ47, eB, UB308080304040NBH8308080304040NB1(Icn 6000A)40100100405050NB1-63(Icn NM8S-800HNM8S-1250SNM8S-1250H39 NM8-400S8510015010015015015010015015050
Moulded Case Circuit BreakersNM8, 0150 40
Moulded Case Circuit BreakersNM8, NM8SUpstream: NM8S-125 1250Downstream: DZ267, DZ47, eB, UB, NBH8, NB1, DZ158, NM8(S)-125 1250UpstreamBreaking capacity(kA 8S-250H100NM8S-400H100Breaking capacity (kA rms)DZ26730803040DZ47, eB, UB30803040NBH830803040NB1(Icn 6000A)401004050NB1(Icn 0HNM8S-800SNM8S-800HNM8S-1250SNM8S-1250H41 100
Moulded Case Circuit BreakersNM8, 0150150150150100150150100150150 42
Moulded Case Circuit BreakersNM8, NM8SCascading (380/400/415V)Upstream: NM8-125 1250;Downstream: DZ47,eB, UB, DZ158, DZ267, NB1, NBH8, NM8(S)-125 1250UpstreamBreaking capacity(kA rms)NM8-125S50DownstreamBreaking capacity (kA -250R150DZ47, eB, UB152020152020NB1(Icn 6000A)253030253030NB1-63(Icn 30HNM8S-800SNM8S-800HNM8S-1250SNM8S-1250H43 1001501001501507015010015015070
Moulded Case Circuit BreakersNM8, 100150150150150150100150150100150150 44
Moulded Case Circuit BreakersNM8, NM8SUpstream：NM8S-125 1250Downstream：DZ267, DZ47, eB, UB, NBH8, NB1, DZ158, NM8（S）-125 1250UpstreamBreaking capacity(kA 8S-250H100NM8S-400H100Breaking capacity (kA rms)DZ47, eB, UB15201520NB1(Icn 6000A)25302530NB1-63(Icn 1250H45
Moulded Case Circuit BreakersNM8, 070707070707070707070 46
Moulded Case Circuit BreakersNM8, NM8S10.6 Protection discrimination(selectivity)Protection discrimination is a must factor in low-voltage power distribution design so as to ensure reliability and continuity for users'electricity utilization.Whenever there is fault occurring in the electric network, the upstream breaker where the fault is occurring breaks.Protection discrimination could be clarified into 3 kinds: Total protection discrimination, partial protection discrimination and noprotection discrimination(refer to fig aside):Total protection discrimination: For all kinds of current where the faults occurred, including the overload current and nonresistancecurrent, breaker D2 breaks and breaker D1 keeps making status.Partial protection discrimination: For a much lower current compared with where the fault occurred (the limit value of protectiondiscrimination), breaker D2 breaks and breaker D1 keeps making status (total protection discrimination).When the fault current is lower than limit value of protection discrimination, the upstream and downstream breakers are applicableto protection discrimination; when the fault current exceeds limit value of protection discrimination, the upstream and downstreambreakers are not applicable to protection discrimination (no protection discrimination). And both of the breakers of D1 and D2 break.Upstream: NM8-125 1250Downstream: DZ267, DZ47, eB, UB, NBH8, NB1, DZ158UpstreamDownstream In (A)Ii (kA) 10DZ267C CurvesNM8-125 .40.50.50.50.50.50.50.516202532 100.190.251625C 0DZ47, eB, UBNM8-250 S/H/R405060 100.190.2516NBH820B C .630.81.0TT0.50.630.81.0TTTT0.630.81.0TTTT40 81.0TTTT630.81.0TTTT1.0TTTTTTT1620NB125B C D Curves3240DZ1588010047 0.190.25
Moulded Case Circuit BreakersNM8, NM8SD1D2NM8-400 S/H/RNM8-630 S/H/RNM8-800 S/HNM8-1250 TTTTTTTTTTTTTTTT 48
Moulded Case Circuit BreakersNM8, NM8SUpstream: NM8S-125 1250Downstream: DZ267, DZ47, eB, UB, NBH8, NB1, DZ1
Blank: for power distribution; M: for motor protection Number of poles: 2: 2-pole 3: 3-pole 4: 4-pole 4A: Without current release components, N-pole is always at making status 4B: Without current release components, N-pole makes with other three poles (N-pole fir
Zhejiang CHINT Electrics Co., Ltd, the business unit of CHINT for Low-voltage Electrical Products, is a nation-wide leader in power distribution and industrial control industry and is one of the core businesses of CHINT Group. The
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Astronergy/Chint Solar is a specialized subsidiary of the CHINT group and is engaged in the PV power station development and PV module production. Astronergy is currently one of the largest domestic PV power generatio
Power Factor Compensation(Outdoor) Distrivuted Solar Inv Power of Dedication has transformed CHINT from a simple electric component manufacturer into a leading electric system solution provider, enabling all users from power transmission, distribution and usage sectors
Reactive power adjusting & Active power derating functions Built-in low frequency transformer Information furnished is believed to be accurate and reliable. However, Chint Power assumes no responsibility for the consequences of use of such information nor for any infringement of patents or ot
security rules for protecting EU classified information, certain provisions in this guide are still based on Commission Decision 2001/844. In the absence of new guidelines they should continue to be applied. Under the new security rules, all classification markings must now be written in FR/EN format (e.g. RESTREINT UE/EU RESTRICTED). EU grants: H2020 Guidance — Guidelines for the .
