Redline. Line protection by means of MCB s. Protection against overloads. Circuit Protection T1.2

Transcription

1 Redline Circuit Protection Line protection by means of MCB s Protective devices shall be capable of breaking any overcurrent up to and including the prospective shortcircuit current at the point where the device is installed. One of the protective devices complying with those conditions is the MCB. Protection against overloads According to IEC 0 protective devices shall be provided to break any overload current flowing in the circuit conductors before such a current could cause a temperature rise detrimental to insulation, joints or surrounding goods to the conductors. he operating characteristics of a device protecting a cable against overload shall satisfy the two following conditions: l B ln lz l.5 lz Circuit characteristic Protective device characteristic I B = Current for which the circuit is designed. I Z = Continuous current carrying capacity of the cable. In= Nominal current of the protective device. I = Current ensuring effective operation of the protective device. In and I are values provided by the manufacturer of the protective device. Calculation of the cable cross section shall be done following the national wiring regulations as well as the IEC 055 standard. he maximum current admissible by the conductor (Iz) depends of following factors:. Conductor crosssection.. Insulation material.. Composition of the conductor.. Ambient temperature. 5. Emplacement and canalisation. Protection of phase conductor Protection of overcurrent shall be provided for all phase conductors; it shall cause the disconnection of the conductor in which the overcurrent is detected, but not necessarily of other live conductor except in the following cases: In or N systems, for circuits supplied between phases and in which the neutral conductor is not distributed, overcurrent detection need to be provided for one of the phase conductors, provided that the following conditions are simultaneously fulfilled: here is, in the same circuit or on the supply side a differential protection intended to cause disconnection of all the phase conductors; he neutral conductor is not distributed from an artificial neutral point of the circuit situated on the load side of the differential protective device. In I systems it is mandatory to protect all the phase conductors. Protection of neutral conductor I system In I systems it is strongly recommended that the neutral conductor should not be distributed. However, when the neutral conductor is distributed, it is generally necessary to provide overcurrent detection for the neutral conductor of every circuit, which will cause the disconnection of all live conductors of the corresponding circuit, including the neutral conductor. his measure is not necessary if: he particular neutral conductor is effectively protected against shortcircuit by a prospective device placed on the supply side. or if the particular circuit is protected by a RCD with a rated residual current not exceeding 0, times the currentcarrying of the corresponding neutral conductor. his device shall disconnect all the live conductors of the corresponding circuit, including the neutral conductor. & N systems Where the cross sectional area of the neutral conductor is at least equal or equivalent to that of the phase conductors, it is not neccesary to provide overcurrent detection for the neutral conductor or a disconnecting device for that conductor. Where the cross sectional area of the neutral conductor is less than that of the phase conductor, it is neccesary to provide overcurrent detection for the neutral conductor, appropiate to the crosssectional area of that conductor; this connection shall cause the disconnection of the phase conductor, but not neccesarily of the neutral conductor.

2 However, overcurrent detection does not need to be provided for the neutral conductor if the following two conditions are simultaneously fulfilled: he neutral conductor is protected against shortcircuit by the protective device for the phase conductors of the circuit, and he maximum current likely to traverse the neutral conductor is, in normal service, clearly less than the value of the currentcarrying capacity of that conductor. System NC, PEN conductor NS separate PE & N conductors I S N =S F III+N P PN PN+ RCD P PN+ RCD S N <S F III+N P PN PN+ RCD P III P P+ RCD P I+N P PN PN+ RCD P S N = Crosssection of neutral conductor S F = Crosssection of phase conductor P = Protected pole RCD= Residual current device N = Neutral pole II P P+ RCD P Protection against shortcircuit According to IEC 0 protective devices shall be provided to break any shortcircuit current flowing in the circuit conductors before such a current could cause danger due to thermal and mechanical effects produced in conductors and connections. o consider that an installation is well protected against shortcircuits, it is required that the protective device complies with the following conditions: he breaking capacity shall not be less than the prospective shortcircuit current at the place of its installation. Icc: Maximum value of the shortcircuit current in that point. Icu: Shortcircuit capacity of the protective device. Calculation of Icc he value of the shortcircuit current flowing at the end of a cable depends on the shortcircuit current flowing at the begining of the cable (transformer terminals), the cross section as well as its length. echnical Data Icu Icc Letthrough energy I t smaller than admissible energy of the cable. According to IEC 07 there are some cases where the omission of devices for protection against overload is recommended for circuits supplying currentused equipment where unexpected opening of the circuit could cause danger. Examples of such a cases are: Excitation circuit of rotating machines. Supply circuit of lifting magnets. Secondary circuits of current transformers. As in those cases the Iu>Iz, it is necessary to verify the shortcircuit value at the point of the installation to ensure the protection (Icc min) Shortcircuit current at the transformer terminals (Icc 0 ) hree phase oil transformer 0V ransformer power kva Voltage Ucc in % In Arms Icc 0 ka rms

3 . Circuit Protection Calculation of the shortcircuit current in function of: Icc 0, crosssection and length of the conductor. he following table provides information to calculate approximately the shortcircuit current at a relevant point of the installation Values shorter than m or longer than km are not considered. All values are for voltage 0V. Correction coefficient Example Cable with cross section 95 mm Cu, 5 m length, and shortcircuit current at the transformer terminals of ka. Estimated shortcircuit current of ka at the end of the cable. Redline V 0V Line protection Copper conductor mm Length of the line in m Icc o (ka) x95 x x0 x85 x x95 x x0 x85 x Voltage K Icc at the origin of the cable Shortcircuit current at the end of the cable

4 echnical Data Line protection Aluminium conductor mm Length of the line Values shorter than m or longer than km are not considered. All values are for voltage 0V. Correction coefficient Example Cable with cross section 0 mm Al, 5 m length, and shortcircuit current at the transformer terminals of ka. Estimated shortcircuit current of 5.5 ka at the end of the cable x95 x x0 x85 x x95 x x0 x85 x Icc o (ka) Icc at the origin of the cable V 0V 8.5 Voltage K Shortcircuit current at the end of the cable

5 Redline Circuit Protection ransformers in parallel In the case of several transformers in parallel there are some points of the installation where the Icc is the sum of the shortcircuit currents provided by each transformer. he shortcircuit capacity of the protective devices shall be calculated taking into consideration the following criteria: Shortcircuit in A: Icu Icc + Icc Shortcircuit in F: Icu Icc Shortcircuit in D: Icu Icc + Icc + Icc Letthrough energy he standard IEC 0 describes that the current limiting of the conductors (K S ) shall be equal or greater than the letthrought energy (I t) quoted by the protective device. he K coefficient depends on the conductor insulation. S is the cross section of the conductor. Copper conductor Insulation K= Cross section mm PVC I t K S Rubber Polyethylene XLPE Maximum admissible value K S x Aluminium conductor Insulation PVC Rubber Polyethylene XLPE K= Cross section mm Maximum admissible value K S x

6 Maximum protected cable length in the event of shortcircuit (Icc minimum) he following values are applicable in case that the protective device does not exist or is overrated. hey are calculated according to the formula:. U. S Icc=. K. ρ.. L U: Voltage 0V 0,8: Reduction coefficient due to impedances S: Conductor cross section ρ: Cu resistivity: 0.0 Ω mm /m L: Conductor length K: Correction coeffecient Maximum protected cable length in case of shortcircuit For network x0 V without N, ripping characteristic C (Im: x In) It is possible to determinate the maximum cable length protected in the event of shortcircuit current in function of: he nominal current he nominal voltage he conductor characteristic he magnetic tripping characteristic of the protective device he shortcircuit current at any point of the installation shall be high enough to disconnect the protective device. o ensure the MCB disconnection, we needed to take into consideration the following table echnical Data In (A) S mm x95 x x0 x85 x x95 x x0 x85 x 0, Maximum protected length (m) for Cu conductor Example Network x0+n with a copper conductor of 95mm crosssection and using as a protection device a MCB C. Maximum cable length: Lmax= 89x8x=9m Correction coefficients ripping characteristic Voltage Conductor Cross section> mm Number of cables in parallel Curve B Curve D Curve Im K x x x /lm x V x 0V + N V PhaseN x 0V + N/ K x 8 x 8 x 8 x 0.9 Aluminium K x K x 0 x 5 x 0 x 0.75 x K5 x 0 x 0 x x 0 x..7

7 Redline Circuit Protection Characteristics according to EN/IEC 0898 Miniature Circuit Breakers are intended for the protection of wiring installations against both overloads and shortcircuits in domestic or commercial wiring installations where operation is possible by uninstructed people. ripping characteristic curves B, C and D Rated shortcircuit breaking capacity (Icn) Is the value of the shortcircuit that the MCB is capable of withstanding in the following test of sequence of operations: OtCO After the test the MCB is capable, without maintenance to withstand a dielectric strength test at a test voltage of 900V. Moreover the MCB shall be capable of tripping when loaded with.8 In within the time corresponding to 5 In but greater than 0.s. Service shortcircuit breaking capacity (Ics) Is the value of the shortcircuit that the MCB is capable of withstanding in the following test of sequence of operations: OtCOtCO After the test the MCB is capable, without maintenance to withstand a dielectric strength test at a test voltage of 0V. Moreover the MCB shall not trip when a current of In. he MCB shall trip within h when current is. In. Magnetic release An electromagnet with plunger ensures instantaneous tripping in the event of shortcircuit. he standard distinguishes three different types, following the current for instantaneous release: type B,C,D. O Represents an opening operation CO Represents a closing operation followed by an automatic opening. t Represents the time interval between two successive shortcircuit operations: minutes. he relation between the Rated shortcircuit capacity (Icn) and the Rated service shortcircuit breaking capacity (Ics) shall be as follows: lcn (A) Ics (A) lcn (A) B C D est current x ln 5 x ln 5 x ln x ln x ln x ln ** if In A, t < 8s ripping time 0. < t < 5s (In A) 0. < t < 90s (In > A) t < 0.s 0. < t < s (In A) 0. < t < s (In > A) t < 0.s 0. < t < s(**) (In A) 0. < t < 8s (In > A) t < 0.s Applications Only for resistive loads such as: electrical heating water heater stoves Usual loads such as: lighting socket outlets small motors Control and protection of circuits having important transient inrush currents (large motors) 000 > > lcn min lcn min. 70 hermal release he release is initiated by a bimetal strip in the event of overload. he standard defines the range of releases for specific overload values. Reference ambient temperature is C. est current. x ln ripping time t h (ln A) t h (ln > A).5 x ln t < h (ln A) t < h (ln > A) 5 x ln s < t < 0s (ln A) s < t < s (ln > A).8

8 Information on product according to EN/IEC 0898 Example: P MCB C characteristic A rade mark Approvals on shoulder Rated current proceeded by the symbol of the tripping curve Rated shortcircuit breaking capacity Icn Rated voltage Product name Electric diagram Catalogue number ONOFF indicator echnical Data Approvals on front echnical data according to IEC 097 Use of an MCB Safety terminals to avoid incorrect introduction of wires Contact position indicator Access to the mechanism for extensions oggle Bistable clip Rail for terminal indicator Bifunctional terminal for connectivity through busbars/wires

9 Redline Characteristics according to EN/IEC 097 Miniature Circuit Breakers are intended for the protection of the lines against both overloads and shortcircuits in industrial wiring installations where normally operation is done by instructed people. Circuit Protection ripping characteristic curves B, C, D and Z 0 0 ripping characteristic curve K (Z) (B) 5 8.5(C) (D and M) 8 (K)..5 Magnetic release An electromagnet with plunger ensures instantaneous tripping in the event of shortcircuit. he standard leaves the calibration of magnetic release to the manufacturer s discretion. GE offers instantaneous tripping ranges: Z: ln B: ln C: 8.5 In ( In for A) D and M: ln hermal release he release is initiated by a bimetal strip in the event of overload. he standard defines the range of release for two special overload values. Reference ambient temperature is: C for G0 and G0 (B, C, D) C for G and G (B, C, D) C for EP0 and EP (Z) Magnetic release An electromagnet with plunger ensures instantaneous tripping in the event of shortcircuit. he standard leaves the calibration of magnetic release to the manufacturer s discretion. GE offers instantaneous tripping ranges: K: ln Motors starting I = In, tripping > s. hermal release he release is initiated by a bimetal strip in the event of overload. he standard defines the range of release for two special overload values. Reference ambient temperature is: 5 C for EP0 and EP0 (K) est current. x ln ripping time t h (ln A) t h (ln > A) est current 5 x ln ripping time t h (ln A) t h (ln > A).5 x ln t < h (ln A) t < h (ln > A). x ln t < h (ln A) t < h (ln > A).

10 Shortcircuit test Rated ultimate shortcircuit breaking capacity (Icu) Is the value of the shortcircuit that the MCB is capable of withstanding in the following test of sequence of operations: OtCO After the test the MCB is capable, without maintenance, to withstand a dielectric strength test at a test voltage of 00V. Moreover the MCB shall be capable of tripping when loaded with,5 In within the time corresponding to In but greater than 0.s. Rated service shortcircuit breaking capacity (Ics) Is the value of the shortcircuit that the MCB is capable of withstanding in the following test of sequence of operations: OtCOtCO After the test the MCB is capable, without maintenance, to withstand a dielectric strength test at a test voltage of twice its rated insulation voltage with a minimum of 00V. A verification of the overload releases on In and moreover the MCB shall trip within h when current is.5 In (for In < A) and h (for In > A). ripping characteristic curves and their applications B: Protection of generators, long distance cables, resistive loads, people protection in N systems. C: General purpose, resistive and inductive loads. D: High inductive loads, transformers LV/LV with high peak current. K: Motors, pumps, fans, transformers, lamps groups, avoiding nuisance tripping. Z: Protection of electronic loads (semi conductors etc.) and secundary measurement circuits, long distance cables allowing cost saving with smaller section. Circuits feeding motors Advantages of Kcurve protection Curve K (EN/IEC 097) versus B, C, D (EN/IEC 0898) 0 I =. x In I =.5 x In hermal tripping. In.5 In Curve B,C,D: C Curve K: 5 C echnical Data O Represents an opening operation CO Represents a closing operation followed by an automatic opening. t Represents the time interval between two successive shortcircuit operations: minutes. Category A: Without a shorttime withstand current rating. Seconds Minutes K curve avoids nuisance tripping at the starting of motors (typical peak In) for a minimum of seconds. B,C and D don t garantee nuisance tripping. Magnetic tripping 8 In In Utilization category Application with respect to selectivity B C D 8 K A Circuit breakers not specifically intended for selectivity under shortcircuit conditions with respect to other shortcircuit protective devices in series on the load side, i.e. without an intentional shorttime delay provided for selectivity under shortcircuit conditions, and therefore without a shorttime withstand current rating according to.. B Circuit breakers specifically intended for selectivity under shortcircuit conditions with respect to other shortcircuit protective devices in series on the load side, i.e. without an intentional shorttime delay (which may be adjustable), provided for selectivity under shortcircuit conditions. Such circuitbreakers have a shorttime withstand current rating according to...

11 Redline Information on product according to EN/IEC 097 Example: EP P A 5 to Iu Circuit Protection rademark Rated current ripping curve Service category and calibration temperature Product name Catalogue number Electrical diagram Rated shortcircuit breaking capacity Icu/Ics Rated voltage IEC 097 standard Use of an MCB Contact position indicator Access to the mechanism for extensions oggle Circuit indicator.

12 ACCESS O HE MECHANISM FOR EXENSIONS Connection of the extensions. It is possible to couple any auxiliary contact, shunt trip, undervoltage release or motor driver either on the right or the left hand side, following the stackon configuration of the extensions in page. echnical Data OGGLE o switch the MCB ON or OFF CONAC POSIION INDICAOR Printing on the toggle to provide information of the real contact position. OOFF Contacts in open position. Ensure a distance between contacts > mm. ION Contacts in closed position. Ensure continuity in the main circuit..

13 Redline Definitions related to MCB s MCB= Miniature Circuit Breakers Circuit Protection Shortcircuit (making and breaking) capacity Alternating component of the prospective current, expressed by its r.m.s. value, which the circuitbreaker is designed to make, to carry for its opening time and to break under specified conditions. Ultimate or rated shortcircuit breaking capacity (Icn EN/IEC 0898) A breaking capacity for which the prescribed conditions, according to a specified test sequence do not include the capability of the MCB to carry times its rated current for the conventional time. Ultimate shortcircuit breaking capacity (Icu EN/IEC 097) A breaking capacity for which the prescribed conditions, according to a specified test sequence do not include the capability of the MCB to carry its rated current for the conventional time. Service shortcircuit breaking capacity (Ics EN/IEC 0898) A breaking capacity for which the prescribed conditions according to a specified test sequence include the capability of the MCB to carry times its rated current for the conventional time. Service shortcircuit breaking capacity (Ics EN/IEC 097) A breaking capacity for which the prescribed conditions according to a specified test sequence include the capability of the MCB to carry its rated current for the conventional time. Prospective current he current that would flow in the circuit, if each main current path of the MCB were replaced by a conductor of negligible impedance. Conventional nontripping current (Int) A specified value of current which the circuit breaker is capable of carrying for a specified time without tripping. Conventional tripping current (It) A specified value of current which causes the circuit breaker to trip within a specified time. Open position he position in which the predetermined clearance between open contacts in the main circuit of the MCB is secured. Closed position he position in which the predetermined continuity of the main circuit of the MCB is secured. Maximum prospective peak current (Ip) he prospective peak current when the initiation of the current takes place at the instant which leads to the highest possible value..

14 Notes echnical Data.

15 Redline Circuit Protection Selectivity An installation with some protective devices in series (a protective device must be placed at the point where a reduction of the cross sectional area of the conductors or another change causes modification in the characteristics of the installation) is considered as selective when, in the event of shortcircuit, the installation is interrupted only by the device which is immediately upstream of the fault point. Selectivity is ensured when the characteristic time/current of the upstream MCB (A) is above the characteristic time /current of the downstream MCB (B). he letthrough energy (I t) of the downstream protective device shall be lower than the one of the upstream protective device. Selectivity may be total or partial. otal selectivity Selectivity is total in the event of a shortcircuit fault and only disconnects the protective device B immediately upstream of the fault point. Partial selectivity Selectivity is partial when the no disconnection of the protective device (A) is ensured only up to a certain level of the current. In figure below is shown that selectivity is total up to the point of overlapping curves. From this point total selectivity can not be assured and selectivity curves based on tests by the manufacturer should be consulted. Disconnects B only Both devices could trip Consult selectivity tables by manufacturer.

16 Selectivity MCB's / MCB's C or G & RCBO's DM Curve B C5 C0 DM0 DM0 () Curve B G0 G0 G DME0 DME0 MCB s In A A A A A A A MCB s In A A A A A A A A A Curve C A 0.07 Curve C A 0.07 A 0. A 0. A A G0G0G Hti S90 A A A A A A.0.0 0A A 0A G0G0G Hti S90 A A A A A A A A 0A echnical Data MCB s Curve C G0G0G Hti S90 Curve C C5 C0 DM0 DM0 () In A A A A A A A A A A A A A A A A A A A 0A A 0A MCB s Curve C G0G0G Hti S90 Curve C G G5 G0 G0 G DME0 DME0 In A A A A A A A A A A A A A A A A A A A A A A A A A 0A () Icc limited to ka for C0, DM0, DM0 () Icc limited to ka for DM0 = otal : selective untill the Icu of the downstream device Example A combination of an MCB C with an upstream MCB C0 guarantees selectivity up to a shortcircuit level of 5 ka..7

17 Redline.8 Circuit Protection Selectivity Fuses glgg / MCB's G0 Example A combination of an MCB G C with an upstream fuse A guarantees selectivity up to a shortcircuit level of. ka. Fuses Curve B G0 DME0 In A A A A A A A A A A Fuses gggl A A A A A 5A... A A A A A Fuses Curve C G0 DME0 Fuses gggl A A A A A A 5.. A..9. A A A A Fuses Curve D G0 ype D In A A A A A A A A A A A A A Fuses gggl A 0. A A 0. A 0. A. 0. 5A.7 A..8 A.7. A A A In A A A A A A A A A A A A A

18 Selectivity Fuses BS / MCB's G0 Curve B G0 DME0 Curve C G0 DME0 Fuses In A A A A A A A A A Fuses In A A A A A A A A A Fuses BS A.8. Fuses BS A.. A A A A A A A A A 0A echnical Data Curve D G0 Fuses In A A A A A A A A A Fuses BS A.7.. A A A A A Example A combination of an MCB G C with an upstream fuse A guarantees selectivity up to a shortcircuit level of. ka..9

19 0 Circuit Protection Example A combination of an MCB G C with an upstream fuse A guarantees selectivity up to a shortcircuit level of. ka. Selectivity Fuses glgg / MCB's G0 Fuses Curve B G0 DME0 In A A A A A A A A A A Fuses gggl Fuses Curve C G0 DME0 Fuses gggl Fuses Curve D G0 ype D In A A A A A A A A A A A A A Fuses gggl A A A A A A.7... A A A A A A In A A A A A A A A A A A A A A A A A A A 5.. A..9. A A A A A A 0. A A 0. A 0. A A..8.7 A A A A A A 9.5 Redline

20 echnical Data Selectivity Fuses BS / MCB's G0 Fuses Curve B G0 DME0 In A A A A A A A A A Fuses BS A.8. A A A A A Fuses Curve C G0 DME0 In A A A A A A A A A Fuses BS A.. A A , 0A A A 9. Fuses Curve D G0 In A A A A A A A A A Fuses BS A.7.. A A A A A 9.

21 Redline Selectivity MCCB's Record / MCB's ElfaPlus A A DDL D0 D DH 0 DH D0L DL D0 DH0 D0L A A A 0A A A A A 0A A 0A 0A A 0A A A 0A D0S DH0S All D DH DL DH0 All DS D DHS DS D0S All All (A) Circuit Protection Curve B C50 / DM00 () Curve B G0 / DME Curve B G0 / DME0 Curve B G () Icc limited to ka for C0, DM0 Icc limited to ka for DM0 = otal : selective untill the Icu of the downstream device OR the Icu of the upstream device Example A combination of an MCB G C with an upstream D0 0A guarantees selectivity up to a shortcircuit level of ka. MCCB MCB D0 A G C

22 echnical Data Selectivity MCCB's Record / MCB's ElfaPlus Curve C C 50 / DM 00 () Curve C G5 Curve C G0 / DME0 Curve C G0 / DME0 Curve C Hti DDL D0 D DH 0 DH D0L DL D0 DH0 D0L A A A A A A A A A A.0 0A A 0A 0A A A A A 0A All All All All 0 (A) D DH DL DH0 DS DHS D0S D DS D0S DH0S () Icc limited to ka for C0, DM0 Icc limited to ka for DM0 = otal : selective untill the Icu of the downstream device OR the Icu of the upstream device

23 Circuit Protection Redline Redline G0 B/C curve G0 B/C curve G B/C curve Hti B/C curve S90 C curve In (A) Record Plus M type FD0E FD0S FD0N, H & L Selectivity limit in ka * = otal: selective unil the lowest Icu value of the two devices placed in series. Selectivity MCCB s Record Plus / MCB s Redline

24 5 echnical Data Record Plus M type FE0N, H & L ML FE0N, H & L MLD FE0N, H & L SMR FEN, H & L MLD FEN, H & L SMR Selectivity limit in ka * = otal: selective unil the lowest Icu value of the two devices placed in series. Selectivity MCCB s Record Plus / MCB s Redline Redline G0 B/C curve G0 B/C curve G B/C curve Hti B/C curve S90 C curve In (A) & 0

25 Redline Association (backup protection) Circuit Protection Association consist the use of an MCB with lower breaking capacity than the presumed one at the place of its installation. If another protective device installed upstream is coordinated so that the energy letthrough by these two devices does not exceed that which can be withstood without damage by the device placed downstream and the conductor protected by these devices. In the event of shortcircuit, both protective devices will disconnect, therefore the selectivity between them is considered as partial. Association reduces the cost of the installation in case of high shortcircuit currents. o obtain association between a breaker and a protective device, several conditions linked to the components characteristic must be fullfilled. hose have been defined by calculation and testing. SCPD SCPD: ShortCircuit Protective Device : Fuses / : MCB s Redline Icc max 0 ka* * ka, 0V with x 8 cartridge fuses : MCB s ElfaPlus : fuses Series In (A) min. rating (A) ype gg max. rating (A) min. rating (A) ype am max. rating (A) Curve C G0 G0 G Hti 0 8 (*) (*) (*) (*) (*) (*) 0 (*) (*) 0 (*) (*) (*) (*) (*) (*) (*) (*) (*) (*) * In case of MCB with B characteristics

26 Backup MCB's Redline / MCB's Redline Voltage 0/V, Icc max. In ka G5 G0 G0 Icu (ka) In (A) G0 ka... G0 ka... G ka < G ka... G ka... Hti ka... 0 Voltage /V, Icc max. In ka C5 C0 DM0 DM0 G5 G0DME0 G0DME0 Icu (ka) 5 In (A) G0 ka... G0 ka... G ka < G ka... G ka... Hti ka... echnical Data Backup MCCB's Record / MCB's Redline Voltage /V, Icc max. In ka C5 C0 G5 G0DME0 G0DME0 G G G Hti Icu (ka) 5 In (A) < > >... D 0kA 70 DL ka 90 D0 70kA DH0 ka D0L ka D 70kA DH ka DL ka D0 ka DH0 70kA D0L ka D 70kA DH ka DL ka Voltage 0/V, Icc max. In ka G5 G0 G0 G G G Hti Icu (ka) In (A) D ka DL 0kA D0 ka DH0 ka D0L 0kA D 5kA DH ka DL 0kA D0 5kA DH0 ka D0L 0kA D 5kA DH ka DL 0kA D0 ka DH0 70kA 7

27 Redline Backup RecordPlus / Redline Voltage /V, Icc max. In ka Circuit Protection C5 C0 G5 G0 G0 G G G Hti S90 Icu (ka) 5 Voltage 0/V, Icc max. In ka In (A) FD0E ka FD0S ka FD0N 85kA FD0H 0kA FD0L 0kA FEN 85kA FEH 0kA FEL 0kA G5 G0 G0 G G G Hti S90 Icu (ka) 5 In (A) FD0E ka FD0S ka FD0N ka FD0H ka FD0L 0kA FEN ka FEH ka FEL 0kA Selectivity: MCB S90 / Redline Voltage 0/V, Icc max. In ka EP0 EP0 EP EP EP Icu (ka) In (A) S90 ka 0 S90H ka 8

28 Use in DC Selection criteria he selection of an MCB to protect a D.C. installation depends on the following parameters: he nominal current he nominal voltage of the power supply, which determines the number of poles to switch the device he maximum shortcircuit current, to determine the shortcircuit capacity of the MCB ype of power supply In the event of an insulation fault, it is considered as an overload when one pole or an intermediate connection of the power supply is connected to earth, and the conductive parts of the installation are also connected to earth. Insulated generator In insulated generators there is no earth connection, therefore an earth leakage in any pole has no consequence. In the event of fault between the two poles (+ and ) there is a shortcircuit in the installation which value will depend on the impedance of the installation as well as of the voltage Un. Each polarity shall be provided with the appropriate number of poles. Generator with centre point earth connection In the event of shortcircuit between any pole (+ or ) and earth, there is a Isc<Isc max because the voltage is Un/. If the fault occurs between the two poles there is a shortcircuit in the installation which value depends on the impedance of the installation as well as the voltage Un. Each polarity shall be provided with the necessary number of poles to break the maximum shortcircuit at Un/. echnical Data Generator with one earthed pole In the event of a fault occuring in the earthed pole () there is no consequence. In the event of a fault between the two poles (+ and ) or between the pole + and earth, then there is a shortcircuit in the installation which value depends on the impedance of the installation as well as of the voltage Un. he unearthed pole (+) shall be provided with the necessary numbers of poles to break the maximum shortcircuit. 9

29 Redline Circuit Protection Use of standard MCB in DC (acc. to IEC 097) For MCB s designed to be used in alternating current but used in installations in direct current, the following should be taken into consideration: For protection against overloads it is necessary to connect the two poles to the MCB. In these conditions the tripping characteristic of the MCB in direct current is similar in alternating current. For protection against shortcircuits it is necessary to connect the two poles to the MCB. In these Use in DC selection table Series G0 () G0 () G () EP0UC Rated current (A)...A...A...A...A conditions the tripping characteristic of the MCB in direct current is % higher than the one in alternating current. Use of special MCB (UC) in DC (acc. to IEC 0898) (UC= Universal Current) For MCB s designed to work in both alternating and direct current, it is necessary to respect the polarity of the terminals since the device is equipped with a permanent magnet. 0 V pole V poles in series V pole V poles in series Icu (ka) Icu (ka) Icu (ka) Icu (ka) () Nominal voltage for G0/G0/G: 8/VDC Maximum voltage for G0/G0/G: 5/VDC Installation of MCB s series EP0 UC in direct current Example of utilisation for maximum voltage between lines according to the number of poles MCB s EP 0 UC P EP 0 UC P EP 0 UC P * Maximum voltage between lines Maximum voltage between lines and earth Power supply at bottom terminals V V V V V V () V V V (poles inversion) V Power supply at top terminals () Negative pole connected to earth * On request Example of utilisation for different voltages between line and earth than between two lines MCB s EP 0 UC P EP 0 UC P * Maximum voltage between lines Maximum voltage between lines and earth V Multipole breaking V Generator with centre point earth connection V Multipole breaking V Generator without earth connection or with one earthed pole V Multipole breaking V Generator without earth connection or with one earthed pole * On request.

30 Influence of ambient air temperature on the rated current he thermal callibration of the MCB s was carried out at ambient temperature of C. Ambient temperatures different from C influence the bimetal and this results in earlier or later thermal tripping. 0,5 A A echnical Data A A Influence of air temperature (IEC/EN 0898) : P (Single pole) : mp (Multipole) pole In Calibrated at C n poles In Calibrated at C

31 Redline Circuit Protection ripping current as a function of the frequency All the MCB s are designed to work at frequencies of 0 Hz, therefore to work at different values, consideration must be given to the variation of the tripping characteristics. he thermal tripping does not change with variation of the frequency but the magnetic tripping values can be up to % higher than the ones at 0 Hz. For DC current magnetic tripping is % higher. ripping current variation 0Hz 0Hz. 0Hz 0Hz. 0Hz Limitation curves Letthrough energy I t he limitation capacity of a MCB in shortcircuit conditions, is its capacity to reduce the value of the letthrough energy that the shortcircuit would be generating. Peak current lp It is the value of the maximum peak of the shortcircuit current limited by the MCB. Power losses he power losses are calculated by measuring the voltage drop between the incoming and the outgoing terminals of the device at rated current. Power losses per pole MCB Series G In (A) 8 Voltage drop (V) Energy loss Pw (W) Resistance Z (mohm) Power losses per pole MCB Series Hti A B Icc peak assumed Icc assumed Icc peak limited Icc limited See page. up to. In (A) Voltage drop (V) Energy loss Pw (W) Resistance Z (mohm) Power losses per pole MCB Series C In (A) Voltage drop (V) Energy loss Pw (W) Resistance Z (mohm)

32 C5C0 Curve P+N / module I t Letthrough energy at V Letthrough energy I t (A s) echnical Data.

33 Redline G5 Curve C P, P+N, P, P, P I t Letthrough energy at /0 V G5 Curve C P I t Letthrough energy at V Circuit Protection Letthrough energy I t (A s) Letthrough energy I t (A s) Ip Limited peak current at /0 V Limited peak current I p (ka) 7 5 C C C C C C C C C C C 0.

34 G5 Curve B P, P+N, P, P, P I t Letthrough energy at /0 V G5 Curve B P I t Letthrough energy at V Letthrough energy I t (A s) Letthrough energy I t (A s) echnical Data Ip Limited peak current at /0 V Limited peak current I p (ka) 7 5 B B B B B B B B B 0.5

35 Redline G0 Curve B P, P+N, P, P, P I t Letthrough energy at /0 V G0 Curve B P I t Letthrough energy at V Circuit Protection Letthrough energy I t (A s) Letthrough energy I t (A s) Ip Limited peak current at /0 V Limited peak current I p (ka) 7 5 B B B B B B B B B 0.

36 G0 Curve C P, P+N, P, P, P I t Letthrough energy at /0 V G0 Curve C P I t Letthrough energy at V Letthrough energy I t (A s) Letthrough energy I t (A s) echnical Data Ip Limited peak current at /0 V Limited peak current I p (ka) 7 5 C C C C C C C C C C C 0.7

37 Redline G0 Curve D P, P+N, P, P, P I t Letthrough energy at /0 V G0 Curve D P I t Letthrough energy at V Circuit Protection Letthrough energy I t (A s) Letthrough energy I t (A s) Ip Limited peak current at /0 V Limited peak current I p (ka) 7 5 D D D D D D D D D D D 0.8

38 G0 Curve B P, P+N, P, P, P I t Letthrough energy at /0 V G0 Curve B P I t Letthrough energy at V Letthrough energy I t (A s) 5 Letthrough energy I t (A s) echnical Data 5 0 Ip Limited peak current at /0 V Limited peak current I p (ka) 7 5 B B B B B B B B B 0.9

39 Redline G0 Curve C P, P+N, P, P+N I t Letthrough energy at /0 V G0 Curve C P I t Letthrough energy at V Circuit Protection Letthrough energy I t (A s) 5 Letthrough energy I t (A s) 5 0 Ip Limited peak current at /0 V Limited peak current I p (ka) C C C C C C C C C C C 0.

40 G0 Curve B P, P+N, P, P, P I t Letthrough energy at /0 V G0 Curve B P I t Letthrough energy at V Letthrough energy I t (A s) Letthrough energy I t (A s) echnical Data Ip Limited peak current at /0 V Limited peak current I p (ka) D D D D D D D D D D D 0.

41 Redline G Curve B P, P, P, P I t Letthrough energy at /0 V G Curve B P I t Letthrough energy at V Circuit Protection Letthrough energy I t (A s) Letthrough energy I t (A s) Ip Limited peak current at /0 V Limited peak current I p (ka) B B B B B B B B B 0.

42 G Curve C P, P, P, P I t Letthrough energy at /0 V G Curve C P I t Letthrough energy at V Letthrough energy I t (A s) Letthrough energy I t (A s) echnical Data Ip Limited peak current at /0 V Limited peak current I p (ka) 8 C C C C C C C C C C C 0.

43 Redline G Curve D P, P, P, P I t Letthrough energy at /0 V G Curve D P I t Letthrough energy at V Circuit Protection Letthrough energy I t (A s) Letthrough energy I t (A s) Ip Limited peak current at /0 V Limited peak current I p (ka) D D D D D D D D D D D 0.

44 ripping curves acc. EN/IEC 0898 he following tables show the average tripping curves of the GE MCB s based on the thermal calibration as well as the magnetic characteristic. Curve B Curve D echnical Data x In x In Curve C x In.5

45 Redline Selective circuit breaker S90 Application Fig. No fault main contact: K closes, K opens (KK closed) Parallel current path Circuit Protection he selective circuit breaker ElfaPlus S90 often serves as gang switches in distribution boards with the highest demand on selectivity and operating convenience. he ElfaPlus S90 are used as higher protection element in a installation with different MCB s. he S90 breaker are equipped additional to the main current path with another two circuits: Parallel current path that contains a resistor R for current limitation. Measuring circuit with magnet impulses to close the main contact Function he selective main circuit breaker ElfaPlus S90 is a miniature circuit breaker employed as superordinate protective element in series with traditional MCB s. he unit, in order to switch selectively has in addition to the main current path (fig. ) another paralelle current path with a currentlimiting resistor R and a measuringcircuit with a solnenoid drive to close the main contact. Manual closing (fig. and fig. ) If the selective circuit breaker is manually switchedon, first of all the contact K closes and the operating current flows via the parallel current path. At the same time contact K and hence the measuring circuit are closed (fig. ). Only then is the main contact K closed and the operating current flows via the main current path (fig. ). As the parallel current path owing to resistor R has a higher resistance than the main current path, no mentionable current continues to flow there. On K closing, K in the measuring circuit is reopened. Main current path Measuring circuit Fault closure lockout (fig. ) If the MCB is closed onto an existing fault, the measuring circuit that measures the voltage between line and neutral at the output of the ElfaPlus S90,prevents the main contact K closing. he breaker can not be closed onto the fault and no high current can flow. After a short time contacts K and K are reopened due to the bimetal trip B and the current limited by resistor R in the parallel current path (maximum 5 times rated current) is interrupted. his fault closure lockout thus protects the installation but also the operating personel. Fig. Existing fault: K does not close. B opens K and k after max. s. Parallel current path Main current path Measuring circuit Fig. Manual closing: K and K close Parallel current path Main current path Measuring circuit Selective fault tripping (fig. and fig. ) If the selective circuit is switchedon (K closed) and a fault occurs downstream of an MCB, the fault current is interrupted either by the MCB alone or with the help of the operating main contact K. Contact K remains closed, and current can still flow via parallel current path, even when the arc at the main contact K is quenched (fig. ). If the downstream MCB has isolated the fault from the installation, in the ElfaPlus S90 the main contact is reclosed (fig. ). Loads lying parallel to the faulted circuit are immediatelly supplied with current, at first via the parallel current path and shortly after again via the main current path..

46 Fault upstream of MCB (fig. and fig. ) If the fault occurs between the ElfaPlus S90 and the downstream MCB (or if some reasons a fault behind a miniature circuit breaker is not cleared by it), after quenching of the arc a current limited by resistor R still flows at the contact point K via the parallel current path (fig. ) untill contact K is also opened due to the bimetal B (fig. ) Opening on overload (fig. 5) If an overload current flows fot too long, the bimetal trip B in the main current path operates and opens contact K and K in the main and parallel current paths. Fig. 5 Overload: B opens and K and K Fig. Fault while unit closed: K opens and K closes Parallel current path Main current path Parallel current path Main current path Measuring circuit echnical Data Measuring circuit ripping curve Curve C according to EN/IEC 0898 Manual opening On manual opening the contacts are opened not only in the main current path but also in the parallel current path (K and K) t(s).7

47 Redline Circuit Protection ext for specifiers MCB Series G0/0 According to EN/IEC 0898 standard For DIN rail mounting according to DIN EN/IEC 0; EN/IEC 0; future EN/IEC 07; IEC 07 (top hat rail 5 mm) Grid distance 5 mm Working ambient temperature from C up to + C Approved by CEBEC, VDE, KEMA, IMQ... pole is a module of 8 mm wide Nominal rated currents are: ////////////// A ripping characteristics: B,C,D,K Number of poles: P, P+N, P, P, P+N, P he shortcircuit breaking capacity is: /,5//kA, energy limiting class erminal capacity from up to 5mm rigid wire or,5 up to mm flexible wire. Screw head suitable for flat or Pozidriv screwdriver Can be connected by means of both pin or fork busbars on bottom terminals he toggle can be sealed in ON or OFF position Rapid closing Both incoming and outgoing terminals have a protection degree of IP and they are sealable Isolator function thanks to the printing Red/Green on the toggle. Maximum voltage between two phases; V~ Maximum voltage for utilisation in DC current: 8 V P and V P wo position rail clip Mechanical shock resistance g (direction x, y, z) minimum 8 shocks 5 ms halfsinusoidal acc. to IEC 0087 Vibrations resistance: g (direction x, y, z) minimum min. according to IEC 008 Extensions can be added on both left or right hand side Auxiliary contact Shunt trip Undervoltage release Motor operator Panel board switch MCB s have a circuit indicator for easy circuit identification Addon RCD can be coupled MCB Series G According to EN/IEC 097. standard For DIN rail mounting according to DIN EN/IEC 0; EN/IEC 0; future EN/IEC 07; IEC 07 (top hat rail 5 mm) Working ambient temperature from C up to + C pole is a module of 8 mm wide Nominal rated currents are: 0,5////////////// A ripping characteristics: B,C Number of poles: P, P, P, P he shortcircuit capacity is: /// ka erminal capacity from up to 5mm rigid wire or,5 up to mm flexible wire Screw head suitable for flat or Pozidriv screwdriver Can be connected by means of both pin or fork busbars on bottom terminals he toggle can be sealed in ON or OFF position Rapid closing Both incoming and outgoing terminals have a protection degree of IP and they are sealable Isolator function thanks to the printing Red/Green on the toggle. Maximum voltage between two phases; V~ Maximum voltage for utilisation in DC current: 8 V P and V P wo position rail clip Mechanical shock resistance g (direction x, y, z) minimum 8 shocks 5 ms halfsinusoidal acc. to IEC 0087 Vibrations resistance: g (direction x, y, z) minimum min. according to IEC 008 Extensions can be added on both left or right hand side Auxiliary contact Shunt trip Undervoltage release Motor operator Panel board switch MCB s have a circuit indicator for easy circuit identification Addon RCD can be coupled.8

48 MCB Series EP0 UC According to EN/IEC 0898 standard For DIN rail mounting according to DIN EN/IEC 0; EN/IEC 0; future EN/IEC 07; IEC 07 (top hat rail 5 mm) Grid distance 5 mm Working ambient temperature from C up to + C pole is a module of 8 mm wide Nominal rated currents are: 0,5////////////// A ripping characteristics: B, C Number of poles: P, P he shortcircuit breaking capacity is: ka, energy limiting class erminal capacity from up to 5mm rigid wire or,5 up to mm flexible wire Screw head suitable for flat or Pozidriv screwdriver Can be connected by means of both pin or fork busbars on top or bottom terminals he toggle can be sealed in ON or OFF position Rapid closing Both incoming and outgoing terminals have a protection degree of IP and they are sealable Isolator function thanks to the printing Red/Green on the toggle. Maximum voltage: P V P V. Poles in series wo position rail clip Mechanical shock resistance g (direction x, y, z) minimum 8 shocks 5 ms halfsinusoidal according to IEC 0087 Vibrations resistance: g (direction x, y, z) minimum min. according to IEC 008 Extensions can be added on both left or right hand side Auxiliary contact Shunt trip Undervoltage release Motor operator Panel board switch MCB s have a circuit indicator for easy circuit identification Addon RCD can be coupled MCB Series Hti According to EN/IEC 097. standard For DIN rail mounting according to DIN EN/IEC 0; EN/IEC 0; future EN/IEC 07; IEC 07 (top hat rail 5 mm) Working ambient temperature from C up to + C pole is a module,5 module (7mm) Nominal rated currents are: /0/A ripping characteristics: B, C, D Number of poles: P, P, P, P he shortcircuit capacity is: ka erminal capacity from,5 up to 70mm he toggle can be sealed in ON or OFF position Both incoming and outgoing terminals have a protection degree of IP and they are sealable Isolator function thanks to the printing red/green on the toggle. It can be used as main switch Maximum voltage between two phases: V~ wo position rail clip Mechanical shock resistance g (direction x, y, z) minimum 8 shocks 5 ms halfsinusoidal according to IEC 0087 Extensions can be added Auxiliary contact Shunt trip Endurance: Mechanical: 00 operations Electrical: 00 operations Addon RCD can be coupled echnical Data.9