Direct current distribution

Transcription

1 Direct current distribution Choosing and implementing protective devices Complementary technical information schneiderelectric.com

2 Choosing and implementing circuit breakers This document illustrates the use of the Acti 9 product range for the protection of direct current distribution applications of voltage less than 500 V. There is also a circuit breaker offer dedicated to photovoltaic applications: C60PVDC (low breaking capacity.5 ka and higher voltage 800 V). Choice Choosing the rating The thermal tripping curve of a circuit breaker is the same in direct current as in alternating current (50/60 Hz). The rule for choosing is therefore the same: to ensure protection against circuit overloads, choose a circuit breaker with a rating (In) less than or equal to the current (Iz) allowed to pass through the cable. Circuits with momentary current direction reversal In the case of circuits with momentary current direction reversal: bbc60hdc circuit breakers cannot be used bbic60 circuit breakers can be use Examples of circuits with momentary current direction reversal bbparalleled energy sources (photovoltaic cells, generators, generating sets, etc.). DB570 bbbatteries with rectifier/charger. DB57 bbmotor protective devices capable of operating as a generator. DB57 Use of the C60PVDC is specifically dedicated to photovoltaic (PV) applications (generally higher voltages with low breaking capacity). Version :.0 0/0/07

3 Choosing and implementing circuit breakers DB s pour I/In =, s pour I/In =, Choosing the curve The magnetic tripping threshold must be: bbhigher than the inrush currents due to loads (motors, capacitors, etc.) bblower than the shortcircuit current at the installation point, which depends on: vvthe shortcircuit power of the source (indicated by the manufacturer), vvthe impedance of the supply line. 0 t(s) 0, 0,0 B C D 5.7 ±0%. ±0% 7 ±0% I / In Example: ic60, B, C, D curves, ratings from 6 A to 6 A. In direct current: bbthe shortcircuit power of the sources is generally low: batteries, photovoltaic panels, generators, electronic converters, etc bbthe loads generate lower inrush currents than in alternating current (e.g. motor startup: to times the rated current) bbthe magnetic threshold of Acti 9 circuit breakers (relative to the rated current) is higher than in alternating current. Circuit breaker ic60 / C0 / NG5 C60HDC Curve Z B C D C Magnetic tripping, 5 In,5 7 In 9 In 0 In 7.0 In threshold > Generally, choose a C60HDC circuit breaker or a Bcurve ic60 circuit breaker. Note: It may be necessary to choose a C curve or a D curve for very high inrush current applications (e.g., electronic equipment with particularly large capacitive filters). Choosing the breaking capacity The choice of circuit breaker with respect to the breaking capacity depends on: bbthe earthing system bbthe network voltage bbthe shortcircuit current at the installation point in question. Note: The breaking capacities are given for a time constant (L/R) equal to 0.05 s.. Reading the tables bbselect the table according to the earthing system. bbselect the circuit breaker corresponding to the network: vvthe circuit breaker(s) to be installed is/are identified based on the rating and shortcircuit current, vvthe type of connection (number of poles, position relative to the load, isolation of polarities) is indicated according to the voltage. Version :.0 0/0/07

4 Choosing and implementing circuit breakers Choosing circuit breakers for distribution with earthed polarity ic60, C0, NG5 offer The following tables show the number of poles connected in series according to the DC network voltage, and the circuit breaking performance of our circuit breaker range. Breaking capacity for a maximum voltage per pole of: 60 V DC for the ic60 offers and 5 V DC for the C0 and NG5 offers Isc (ka) In (A) ic60, C0, NG5...? Product range Maximum rating (A) DB066 u 5 y 5 ( ) Rating > 80 A * only with NG5N P and P. Compact NSX NG5N * y 80 C0H C0N NG5N y 6 NG5L NG5H Breaking capacity (ka) Icu IEC 6097 y 50 y 6 y 5 ic60l y 0 ic60h y 5 ic60n y 0 ic60a DB060 In Un a B A R R: Load The figure shows a source with the negative polarity earthed. Fault condition analysis Fault Fault current (max.) Voltage Poles involved in breaking Breaking characteristics A, B Isc Un a Isc at Un on the poles connected to the positive polarity Isc: presumed shortcircuit current. Un: rated network voltage. > All the circuitbreaker poles must be on the nonearthed polarity. DB060 In Un a b B C A R R: Load The figure shows a source with the negative polarity earthed. Fault condition analysis Fault Fault current (max.) Voltage Poles involved in breaking Breaking characteristics A Isc Un a Isc at Un on the poles connected to the positive polarity B Isc Un a b Isc at Un on all the poles connected in series C b No breaking needed Isc: presumed shortcircuit current. Un: rated network voltage. > All the circuitbreaker poles must be on the nonearthed polarity. One pole on the earthed polarity will allow isolation to be performed. Version :.0 0/0/07

5 Product range Un (V DC) P,, P, P...? Number of poles connected in series Product range DB066 Compact NSX P NG5 P P P C0 P P P ic60 P P P to 60 y 5 y 80 y 50 y 75 y 500 Network voltage (V DC) Isolation Not required DB0598 Number of poles and connection diagram P P P DB0599 DB0590 DB Required DB059 DB059 DB R: Load. Version :.0 0/0/07 5

6 Choosing and implementing circuit breakers ic60, C0, NG5 offer Choosing circuit breakers for distribution with earthed midpoint The following tables show the number of poles connected in series according to the DC network voltage, and the circuit breaking performance of our circuit breaker range. Breaking capacity for a maximum voltage per pole of: 60 V DC for the ic60 offers and 5 V DC for the C0 and NG5 offers Isc (ka) In (A) ic60, C0, NG5...? Product range Maximum rating (A) DB066 u 5 y 5 ( ) Rating > 80 A * only with NG5N P and P. Compact NSX NG5N * y 80 C0H C0N NG5N y 6 NG5L NG5H Breaking capacity (ka) Icu IEC 6097 y 50 y 6 y 5 ic60l y 0 ic60h y 5 ic60n y 0 ic60a Fault condition analysis DB0606 In Un/ Un/ a b B C A R R: Load The figure shows a source with earthed midpoint. Fault Fault current (max.) Voltage Poles involved in breaking Breaking characteristics A Isc Un/ a Isc at Un/ on the poles connected to the positive polarity B Isc Un a b Isc at Un on all the poles connected in series C Isc Un/ b IIsc at Un/ on the poles connected to the negative polarity Isc: presumed shortcircuit current. Un: rated network voltage. > The circuitbreaker poles must be distributed symmetrically over the two polarities. Obviously, this connection provides isolation. 6 Version :.0 0/0/07

7 Product range Un (V DC), P...? Number of poles connected in series Product range DB066 Compact NSX NG5 P C0 P ic60 P to 5 y 50 y 500 Network voltage (V DC) Isolation Required or not DB059 Number of poles and connection diagram P DB R: Load. Version :.0 0/0/07 7

8 Choosing and implementing circuit breakers Choosing circuit breakers for distribution isolated from earth ic60, C0, NG5 offer The following tables show the number of poles connected in series according to the DC network voltage, and the circuit breaking performance of our circuit breaker range. Breaking capacity for a maximum voltage per pole of: 60 V DC for the ic60 offers and 5 V DC for the C0 and NG5 offers Isc (ka) In (A) ic60, C0, NG5...? Product range Maximum rating (A) DB066 u 5 y 5 ( ) Rating > 80 A * only with NG5N P and P. Compact NSX NG5N * y 80 C0H C0N NG5N y 6 NG5L NG5H Breaking capacity (ka) Icu IEC 6097 y 50 y 6 y 5 ic60l y 0 ic60h y 5 ic60n y 0 ic60a DB0607 D In Un a b B C A R R: Load The figure shows a source in IT system with a second fault (D) on the negative polarity. Fault condition analysis Fault Fault current (max.) Voltage Poles involved in breaking Breaking characteristics A Low Low a No breaking needed A and D Id () Un a Id at Un on the poles connected to the positive polarity B Isc Un a b Isc at Un on all the poles connected in series C Low Low b No breaking needed Isc: presumed shortcircuit current. Un: rated network voltage. () Fault current values acceptable according to the installation rules. bb If Isc < 0 ka: fault current y 0.5 Isc. bb If Isc > 0 ka: fault current y 0.5 Isc. > The circuitbreaker poles must be distributed symmetrically over the two polarities. Obviously, this connection provides isolation. 8 Version :.0 0/0/07

9 Product range Un (V DC), P...? Number of poles connected in series Product range DB066 Compact NSX NG5 P C0 P ic60 P to 60 y 5 y 50 Network voltage (V DC) Isolation Required or not DB0596 Number of poles and connection diagram P DB R: Load. Version :.0 0/0/07 9

10 Choosing and implementing circuit breakers C60HDC offer Choosing circuit breakers for distribution with earthed polarity Unlike the preceding offers, the C60HDC offer comprises polarised circuit breakers reserved exclusively for direct current applications. As we saw earlier, it is therefore not compatible in the case of circuits with (even momentary) current direction reversal. The same applies to "mixed" networks operating successively in AC and DC (e.g. safety devices). It is an offer corresponding to the C curve and ranging up to 6 A. Maximum rating (A) DB0988 y 6 P Breaking capacity (ka) Icu IEC 6097 y 0 C60HDC y 5 y 0 DB060 "" polarity earthed In a Un R R: Load B A b C The figure shows a source with the negative polarity earthed. "" polarity earthed Fault condition analysis with "" polarity earthed Fault Fault current (max.) Voltage Poles involved in breaking Breaking characteristics A Isc Un a Isc at Un on the pole connected to the positive polarity B Isc Un a b Isc at Un on the both poles C b No breaking needed Isc: presumed shortcircuit current. Un: rated network voltage. > All the circuitbreaker poles must be on the nonearthed polarity. One pole on the earthed polarity will allow isolation to be performed. DB0609 In a Un R R: Load b B C A The figure shows a source with the positive polarity earthed. 0 Version :.0 0/0/07

11 Breaking capacity (ka) Icu IEC 6097 DB0608 y 0 P y 0 P y 6 P to 0 y 0 y 50 y 0 y 500 Network voltage (V DC) Isolation Number of poles and connection diagram "" polarity earthed P Not required DB0597 DB0597 Required DB0599 Isolation Number of poles and connection diagram "" polarity earthed P Not required DB0597 DB0597 Required DB0599 R: Load. Version :.0 0/0/07

12 Choosing and implementing circuit breakers C60HDC offer Choosing circuit breakers for distribution with earthed midpoint Unlike the preceding offers, the C60HDC offer comprises polarised circuit breakers reserved exclusively for direct current applications. As we saw earlier, it is therefore not compatible in the case of circuits with (even momentary) current direction reversal. The same applies to "mixed" networks operating successively in AC and DC (e.g. safety devices). It is an offer corresponding to the C curve and ranging up to 6 A. Maximum rating (A) DB0989 y 6 Breaking capacity (ka) Icu IEC 6097 y 0 C60HDC y 5 y 0 DB0506 In Un/ Un/ a b The figure shows a source with earthed midpoint. B C A R R: Load Fault condition analysis Fault Fault current (max.) Voltage Poles involved in breaking Breaking characteristics A Isc Un/ a Isc at Un/ on the pole connected to the positive polarity B Isc Un a b Isc at Un on the both poles C Isc Un/ b Isc at Un/ on the pole connected to the negative polarity Isc: presumed shortcircuit current. Un: rated network voltage. > The circuitbreaker poles must be distributed symmetrically over the two polarities. Obviously, this connection provides isolation. Version :.0 0/0/07

13 Breaking capacity (ka) Icu IEC 6097 DB0990 y 0 y 0 y 6 to 50 y 0 y 500 Network voltage (V DC) Isolation Required or not DB0599 Number of poles and connection diagram R: Load. Version :.0 0/0/07

14 Choosing and implementing circuit breakers C60HDC offer Choosing circuit breakers for distribution isolated from earth Unlike the preceding offers, the C60HDC offer comprises polarised circuit breakers reserved exclusively for direct current applications. As we saw earlier, it is therefore not compatible in the case of circuits with (even momentary) current direction reversal. The same applies to "mixed" networks operating successively in AC and DC (e.g. safety devices). It is an offer corresponding to the C curve and ranging up to 6 A. Maximum rating (A) DB0989 y 6 Breaking capacity (ka) Icu IEC 6097 y 0 C60HDC y 5 y 0 DB0607 D In Un a b B C A R R: Load The figure shows a source in IT system with a second fault (D) on the negative polarity. Fault condition analysis Fault Fault current (max.) Voltage Poles involved in breaking Breaking characteristics A Low Low a No breaking needed A and D Id () Un a Id at Un on the pole connected to the positive polarity B Isc Un a b Isc at Un on the both poles C Low Low b No breaking needed Isc: presumed shortcircuit current. Un: rated network voltage. () Fault current values acceptable according to the installation rules. bb If Isc < 0 ka: fault current y 0.5 Isc. bb If Isc > 0 ka: fault current y 0.5 Isc. > The circuitbreaker poles must be distributed symmetrically over the two polarities. Obviously, this connection provides isolation. Version :.0 0/0/07

15 Breaking capacity (ka) Icu IEC 6097 DB099 y 0 y 0 y 6 to 0 y 0 y 50 Network voltage (V DC) Isolation Required or not DB0599 Number of poles and connection diagram R: Load. Version :.0 0/0/07 5

16 Choosing and implementing circuit breakers DB0595 DB06089 IEC standard The multipolar low rating use (< A) is not suitable for very low voltage networks (< V DC) Connection Series connection In the preceding offers we extensively used the principle of series connection of products. Series connection of the poles, by dividing the voltage per pole, optimizes the circuit breaking performance for highvoltage networks. Series connection of the poles of a circuit breaker used in direct current therefore makes it possible to: bbdivide the network voltage by the number of poles bbhave the rated current for each pole bbhave the circuit breaker's breaking capacity for all the poles. Direction of cabling and cable length In the case of series connection, the direction of cabling has a major impact on the product's performance. Usually the first product cabling method. will be used. For special applications where there is only a single possible current direction, the second cabling method is preferable, especially for electrical endurance properties. Subsequently the cable cross section and length combination should be optimized, depending on the loads. Generally, a greater length and cross section improves performance. Rating (In) Cross section (mm²) Min. shunt length (mm) y 6 A y y 5 A Note: This table gives the minimum cable (shunt) lengths optimizing the equipment's performance according to the cable cross sections. Clarification concerning voltage drops Importance of allowing for voltage drops Voltage drops are an issue that must be taken into account especially in direct current distribution due to: bbthe common use of very low voltage (, 8 or sometimes V): vvfor a given resistance and current in a circuit, relative voltage drops increase as the voltage is lowered, vvthe natural voltage drop of batteries in power reserve mode, as they are discharged, vvthe criticality of the associated applications, often requiring a high level of security and continuity of service. Cause of voltage drops Voltage drops are caused by the sum of the resistances in series in the circuit: bbinternal resistance (r) of the source bbresistance of connecting cables bbinternal resistance of control and protection switchgear, often significant for circuit breakers of low rating (a few amperes) powered at very low voltage bbit is generally expressed in mω bbin the absence of data directly from the manufacturer, it can be calculated by dividing the power consumption by the square of the current: r = P/I bbspurious resistance of connections. Voltage drops in the circuit must be less than the rated operating tolerances of the various loads in steadystate conditions and especially at startup (inrush current). 6 Version :.0 0/0/07

17 Choosing and implementing circuit breakers Examples of choices Example In a direct current distribution system, powered by a rectifier/charger of voltage 5 V with earthed "" polarity, which circuit breakers should be installed to protect: bbthe battery outgoing feeder of permissible current Iz = 69 A, operating current Ib = 55 A, and shortcircuit current 0 ka? bba lighting outgoing feeder of permissible current Iz = A, operating current Ib = 8 A, and shortcircuit current 0 ka? If the battery outgoing feeder is with momentary current direction reversal, choose an ic60 circuit breaker: Circuit to be protected Choice of circuit breaker Ib = 55 A, Iz = 69 A Rating In = 6 A No high current peak Curve B Un = 5 V, Isc = 0 ka, "" earthed Breaking capacity ic60n Connection poles in series on "" Isolation required pole on "" > Choose a Bcurve ic60n P 6 A circuit breaker with poles connected to the positive polarity. If the lighting outgoing feeder is without momentary current direction reversal, choose a C60HDC circuit breaker: Circuit to be protected Choice of circuit breaker Ib = 8 A, Iz = A Rating In = 0 A No high current peak Curve C Un = 5 V, Isc = 0 ka, "" earthed Breaking capacity C60HDC Connection pole on "" Isolation not required No pole on "" > Choose a C60HDC P 0 A circuit breaker with pole connected to positive polarity. Example In a direct current distribution system, powered by a rectifier/charger of voltage 5 V, with earthed midpoint, which circuit breakers should be installed to protect: bbthe battery outgoing feeder of permissible current Iz = 69 A, operating current Ib = 55 A, and shortcircuit current 0 ka? bba lighting outgoing feeder of permissible current Iz = A, operating current Ib = 8 A, and shortcircuit current 0 ka? If the battery outgoing feeder is with momentary current direction reversal, choose an ic60 circuit breaker of characteristics in compliance with the installation: Circuit to be protected Choice of circuit breaker Ib = 55 A, Iz = 69 A Rating In = 6 A No high current peak Curve B Un = 5 V, Isc = 0 ka, earthed midpoint Breaking capacity ic60h Connection pole on "" pole on "" Isolation required Provided by both poles > Choose a Bcurve ic60h 6 A circuit breaker, connected symmetrically to the "" and "" polarities. Version :.0 0/0/07 7

18 Choosing and implementing circuit breakers If the lighting outgoing feeder is without momentary current direction reversal, choose a C60HDC circuit breaker: Circuit to be protected Choice of circuit breaker Ib = 8 A, Iz = A Rating In = 0 A Un = 5 V, Isc = 0 ka, earthed midpoint Breaking capacity C60HDC Connection pole on "" pole on "" Isolation not required Provided by both poles > Choose a C60HDC 0 A circuit breaker connected symmetrically to the "" and "" polarities. Example In a direct current distribution system powered by two rectifiers in parallel Un = 50 V, Isc ( sources) = 5 ka, in IT system, which circuit breakers should be installed to protect: bbthe pair of rectifiers of permissible current Iz = 69 A and operating current Ib = 55 A? bba lighting outgoing feeder of permissible current Iz = A and operating current Ib = 8 A? If the pair of rectifiers is with momentary current direction reversal, choose an ic60 circuit breaker: Circuit to be protected Choice of circuit breaker Ib = 55 A, Iz = 69 A Rating In = 6 A No high current peak Curve B or C (the magnetic threshold is far lower than the shortcircuit current) Un = 50 V, Isc = 5 ka, IT system Breaking capacity NG5L Connection poles on "" poles on "" Isolation required Provided by the poles > Choose an NG5L P 6 A circuit breaker connected symmetrically to the "" and "" polarities. The lighting outgoing feeder is without momentary current direction reversal but the shortcircuit current is too great to choose a C60HDC circuit breaker. Circuit to be protected Choice of circuit breaker Ib = 8 A, Iz = A Rating In = 0 A No high current peak Curve B Un = 50 V, Isc = 5 ka, IT system Breaking capacity NG5L Connection poles on "" poles on "" Isolation not required Provided by the poles > Choose a Bcurve NG5L P 0 A circuit breaker connected symmetrically to the two "" and "" polarities. 8 Version :.0 0/0/07

19 Earth leakage protection Residual current devices do not work on a direct current distribution system. Earth leakage protection can be provided by circuit breakers or residual current circuit breakers installed on the upstream AC distribution system. Standard IEC 6079 determines applicable values for the protection of users. Residual current devices DC networks isolated from any AC network Residual current devices will not work with a direct current distribution system powered directly by a battery, a generating set, photovoltaic cells, etc., or a rectifier with galvanic insulation. In this case protection for users is provided by choosing a network voltage that is not dangerous and an appropriate earthing system. Safe direct current network voltage Environment TNS system IT system Earthed polarity Earthed midpoint Dry 00 V 00 V 00 V Wet 50 V 00 V 50 V Immersed 5 V 50 V 5 V DC networks connected to an AC network In the case of a direct current distribution system powered by an AC/DC converter (without galvanic insulation), earth leakage protection can be provided by circuit breakers or residual current circuit breakers installed on the AC network upstream of the converter. Protection against direct contact Earth leakage protection of high sensitivity (I n = 0 ma) is compulsory if certain circuits operating on direct current entail risks of baring of live parts (see installation standards). This protection system should be chosen as follows: bbtype A or si (bipolar), if the converter is powered by a singlephase supply bbtype B, if the converter is powered by a threephase supply. The choice of this protection system does not depend on the earthing system. Protection against indirect contact Protection against indirect Mediumsensitivity earth leakage protection contact IΔn u 00 ma Upstream power supply Threephase Singlephase Characteristics of directcurrent circuits to be protected Upstream earthing system Fire protection Fire protection TT or IT with noninterconnected exposed conductive parts TNS IT Upstream power supply Characteristics of directcurrent circuits to be protected Upstream earthing system Without double insulation Type B Type A With double insulation Type A Mediumsensitivity earth leakage protection IΔn = 00 ma Singlephase or threephase Humid or dusty environments, ancient installations and buildings No influence Type A Version :.0 0/0/07 9

20 Lightning protection DB05957 Lightning current Incoming circuit breaker Surge protective device In fact the operating principle of the surge protective device remains identical in direct current; the surge protective devices capture and conduct to earth the current of electric overvoltages. Particularly if the direct current is implemented by a rectifier without galvanic insulation and if the AC network already contains a surge protective device, there will be no need for a specific protective device. Otherwise, the surge protective device should be adapted "finely" to the network voltage (and the overvoltage resistance of the loads, which is linked to the network voltage). Load DB0580 Type Fine protection very close to the loads Type surge protective device The type surge protective device is recommended in the specific case of servicesector and industrial buildings, protected by a lightning rod or a meshed cage. It protects electrical installations against direct lightning strokes. It can discharge the backcurrent from lightning spreading from the earth conductor to the network conductors. Type surge protective devices are characterized by a 0/50 μs current wave. Type surge protective device The type surge protective device is the main protection system for all lowvoltage electrical installations. Installed in each electrical switchboard, it prevents the spread of overvoltages in the electrical installations and protects the loads. Type surge protective devices are characterized by an 8/0 μs current wave. Type surge protective device These surge protective devices have a low discharge capacity. They must therefore mandatorily be installed as a supplement to type surge protective devices and in the vicinity of sensitive loads. Type surge protective devices are characterized by a combination of voltage waves (./50 μs) and current waves (8/0 μs). DB0589 Type Direct impact on the building structure Type Type Impact near the building, on the LV line at the entry to the installation Generally the direct current switching voltage should be assigned a coefficient of compared with alternating current. Apart from this the principle for choosing devices according to the networks remains the same. Network voltage Comments Offer / 8 V Communication ipri < 00 V Communication iprc 00 to 00 V Type and iprd, ipf 00 to 00 V Type and iprf, PRD 00 to 00 V Type PRD Master, PRF Master 600 or 000 V PV applications iprd DC Coordination with disconnectors A study is underway on the coordination of our surge protective devices on direct current networks; it will enable this document to be supplemented at a later stage. 0 Version :.0 0/0/07

21 Characteristics of the distribution system The installation rules of the IEC 606 standard apply to direct current distribution systems. DB06090 Network voltage V, 8 V, 60 V, 5 V, 50 V, 500 V, 750 V. These voltages often depend on the application or the sources used, for example: bbbatteries on singlephase DC charger: voltage 0 V DC, bbbatteries on threephase DC charger: voltage 0 V DC. Overcurrent protection Shortcircuit current The shortcircuit current depends on the source. For a distribution system powered by a battery, it can be calculated by the formula Isc (in A) = kc with: bbc the battery capacity in Ah, bbk a coefficient close to 0 and in any case always less than 0. IEC 6008 standard. Example A 5 V battery of capacity 0 Ah delivers a shortcircuit current Isc between. ka and. ka. Note: Since the Isc current value is relatively low and the distribution system is not very extensive, the maximum shortcircuit current Isc at any point of the installation is taken as equal to the shortcircuit current Isc of the source (value by excess). Overload protection For a load of operating current Ib and a duct of permissible current Iz, the duct protection by a distribution circuit breaker must have a rating In such that: Ib y In y Iz. Shortcircuit protection The installation standards impose no particular constraint: a magnetic tripping threshold Im such that 5 In y Im y 0 In is generally advisable. Version :.0 0/0/07

22 Appendix Appendix ic60, C0, NG5 offer Choosing circuit breakers for distribution with earthed polarity The following tables show the number of poles connected in series according to the DC network voltage, and the circuit breaking performance of our circuit breaker range. Breaking capacity for a maximum voltage per pole of: 7 V DC for the ic60 offers and V DC for the C0 and NG5 offers Isc (ka) In (A) ic60, C0, NG5...? Product range Maximum rating (A) DB06 y 5 ( ) Rating > 80 A * only with NG5N P and P. NG5N * y 80 C0H C0N NG5N y 6 NG5L NG5H Breaking capacity (ka) Icu IEC 6097 y 6 y 5 y 0 ic60l y 5 ic60h y 0 ic60n Fault condition analysis, see page. Version :.0 0/0/07

23 Product range Un (V DC) P,, P, P...? Number of poles connected in series Product range DB060 NG5 P P P C0 P P P ic60 P P P 60 to 7 y y 6 y 88 y y 576 Network voltage (V DC) Isolation, number of poles and connection diagram, see page 5. Version :.0 0/0/07

24 Appendix Appendix ic60, C0, NG5 offer Choosing circuit breakers for distribution with earthed midpoint The following tables show the number of poles connected in series according to the DC network voltage, and the circuit breaking performance of our circuit breaker range. Breaking capacity for a maximum voltage per pole of: 7 V DC for the ic60 offers and V DC for the C0 and NG5 offers Isc (ka) In (A) ic60, C0, NG5...? Product range Maximum rating (A) DB06 y 5 ( ) Rating > 80 A * only with NG5N P and P. NG5N * y 80 C0H C0N NG5N y 6 NG5L NG5H Breaking capacity (ka) Icu IEC 6097 y 6 y 5 y 0 ic60l y 5 ic60h y 0 ic60n Fault condition analysis, see page 6. Version :.0 0/0/07

25 Product range Un (V DC), P...? Number of poles connected in series Product range DB06 NG5 P C0 P ic60 P 5 to y 88 y 576 Network voltage (V DC) Isolation, number of poles and connection diagram, see page 7. Version :.0 0/0/07 5

26 Appendix Appendix ic60, C0, NG5 offer Choosing circuit breakers for distribution isolated from earth The following tables show the number of poles connected in series according to the DC network voltage, and the circuit breaking performance of our circuit breaker range. Breaking capacity for a maximum voltage per pole of: 7 V DC for the ic60 offers and V DC for the C0 and NG5 offers Isc (ka) In (A) ic60, C0, NG5...? Product range Maximum rating (A) DB0667 y 5 ( ) Rating > 80 A * only with NG5N P and P. NG5N * y 80 C0H C0N NG5N y 6 NG5L NG5H Breaking capacity (ka) Icu IEC 6097 y 6 y 5 y 0 ic60l y 5 ic60h y 0 ic60n Fault condition analysis, see page 8. 6 Version :.0 0/0/07

27 Product range Un (V DC), P...? Number of poles connected in series Product range DB06 NG5 C0 ic60 P 5 to y 88 Network voltage (V DC) Isolation, number of poles and connection diagram, see page 9. Version :.0 0/0/07 7

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29 TEvolutions his page must be removed before publishing.0 0/0/07 New charte Sonovision.6 /0/06 Changed C60HDC pages 0 to 5 Sonovision.5 /05/05 P0 add breaking capacity for P 50VDC JPM. /0/0 Changed Compact NS by Compact NSX and photos Sedoc. 7/06/0 Changed text in tables page and page Sedoc. 5/0/0 Changed diagram "" polarity earthed page and replace I by In, for the others Sedoc. 0//0 New presentation Sedoc.0 9//0 Creation Sedoc Indice Date Modification Name Version :.0 0/0/07 9