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Siemens SITOP PSU8200 Manual Download Page 28

Mounting position, mounting clearances 

 

4.2 Other mounting positions 

 

SITOP PSU8200 1ph 

28

 

Manual, 11.2014, C98130-A7633-A1-3-7629 

 

Figure 4-7 

6EP3333-8SB00-0AY0 mounting position (3) 

 

Figure 4-8 

6EP3333-8SB00-0AY0 mounting position (4) 

 

Figure 4-9 

6EP3333-8SB00-0AY0 mounting position (5) 

Summary of Contents for SITOP PSU8200

Page 1: ... SITOP power supply SITOP PSU8200 1ph Manual SITOP PSU8200 24 V 5 A 6EP3333 8SB00 0AY0 SITOP PSU8200 24 V 10 A 6EP3334 8SB00 0AY0 SITOP PSU8200 24 V 20 A 6EP1336 3BA10 11 2014 C98130 A7633 A1 3 7629 Overview Safety instructions 1 Description device design dimension drawing 2 Mounting removal 3 Mounting position mounting clearances 4 Installation 5 Technical data 6 Safety approvals EMC 7 Ambient co...

Page 2: ...operated only by personnel qualified for the specific task in accordance with the relevant documentation in particular its warning notices and safety instructions Qualified personnel are those who based on their training and experience are capable of identifying risks and avoiding potential hazards when working with these products systems Proper use of Siemens products Note the following WARNING S...

Page 3: ... phase line supply around the world AC and DC input voltages possible only for 6EP1336 3BA10 Output voltage can be adjusted in the range 24 28 8 V Power boost during operation with 300 rated current for 25 ms Extra Power with 1 5x rated current for 5 seconds for switching on loads with a high inrush current Especially low width without requiring any lateral mounting clearances Ambient temperature ...

Page 4: ...wer supplies can be expanded using SITOP supplementary modules redundancy module selectivity module buffer module as well as SITOP DC UPS modules Ordering data The following device versions are available Regulated power supply unit SITOP PSU 8200 1ph Type Order number 120 230 VAC input 24 V 5 A output 6EP3333 8SB00 0AY0 120 230 VAC input 24 V 10 A output 6EP3334 8SB00 0AY0 Input 1 and 2 phase AC o...

Page 5: ... Block diagram 19 2 8 Dimensions and weight 21 3 Mounting removal 23 4 Mounting position mounting clearances 25 4 1 Standard mounting position 25 4 2 Other mounting positions 27 4 2 1 6EP3333 8SB00 0AY0 27 4 2 2 6EP3334 8SB00 0AY0 29 4 2 3 6EP1336 3BA10 31 5 Installation 33 5 1 Line side connection 33 5 2 Output side connection 35 6 Technical data 37 6 1 Input 37 6 2 Output 39 6 3 Efficiency 44 6 ...

Page 6: ...bient conditions 53 9 Applications 55 9 1 Parallel connection to increase power rating 55 9 2 Parallel connection for redundancy 57 9 3 Series connection for increased voltage 58 9 4 Overload protection in the 24 V output circuit 59 9 5 Protection against short time voltage dips 60 9 6 Protecting against longer power failures 61 10 Environment 63 11 Service Support 65 ...

Page 7: ...ical injury as well as extensive property damage Only appropriately qualified personnel may work on or in the vicinity of this equipment Perfect safe and reliable operation of this equipment is dependent on proper transportation storage installation and mounting Before installation or maintenance work can begin the system s main switch must be switched off and measures taken to prevent it being sw...

Page 8: ...Safety instructions SITOP PSU8200 1ph 8 Manual 11 2014 C98130 A7633 A1 3 7629 ...

Page 9: ...utput of the device The output of the device is isolated no load proof and short circuit proof The LED displays indicate the operating state The operating state of the device can be processed via the signaling contact The device can be switched ON OFF remotely using a remote contact Line input DC output Potentiometer 24 28 8 V Pilot lamps 24 V OK OVERLOAD SHUTDOWN Signaling contact remote contact ...

Page 10: ...can be set via a potentiometer is available at the output of the device The output of the device is isolated no load proof and short circuit proof The LED displays indicate the operating state The operating state of the device can be processed via the signaling contact Line input DC output Potentiometer 24 28 8 V Pilot lamps 24 V OK OVERLOAD SHUTDOWN Signaling contact remote contact A B selector s...

Page 11: ...terminals are used to connect to the loads to be supplied see also Section Installation Page 33 Connections and terminal designations for 6EP3333 8SB00 0AY0 and 6EP3334 8SB00 0AY0 Line input L1 N PE One screw terminal each output 2 screw terminals output 2 screw terminals signaling contacts 13 14 One screw terminal each remote contacts 15 16 One screw terminal each 1 Do not subject the end stop to...

Page 12: ...2014 C98130 A7633 A1 3 7629 Connections and terminal designations for the 6EP1336 3BA10 Line input L1 N PE One screw terminal each output 2 screw terminals output 2 screw terminals signaling contacts 13 14 One screw terminal each 1 Do not subject the end stop to higher loads Figure 2 4 Terminal data for 6EP1336 3BA10 ...

Page 13: ...y lines to the connected load Figure 2 5 Potentiometer example 6EP3334 8SB00 0AY0 NOTICE Thermal overload possible When adjusting the output voltage to 24 V the output current must be derated by 4 V or the permissible ambient temperature must be taken into account with 3 C V Note It is only permissible to use an insulated screwdriver when actuating the potentiometer For information on actuating th...

Page 14: ...0 V AC 0 5 A 60 V DC 0 3 A 30 V DC 1 A for 24 V O K Figure 2 6 Operating display and signaling contact for 6EP3333 8SB00 0AY0 and 6EP3334 8SB00 0AY0 Signaling 6EP3333 8SB00 0AY0 24 V 5 A 6EP3334 8SB00 0AY0 24 V 10 A Green LED lit Signaling contact contacts 13 14 closed Normal operation output voltage 20 V 0 5 V LED off Signaling contact contacts 13 14 open quiescent position No supply voltage Yell...

Page 15: ...y contact NO contact contact rating 30 V AC 0 5 A 30 V DC 1 A for 24 V O K Figure 2 7 Operating display and signaling contact for 6EP1336 3BA10 Signaling 6EP1336 3BA10 24 V 20 A LED green 4 1 off Signaling contact 5 contacts 13 14 open quiescent position No supply voltage Green LED 4 1 lit Signaling contact 5 contacts 13 14 closed Normal operation output voltage 20 V 0 5 V Yellow LED 4 2 lit Signa...

Page 16: ...cteristic in the overload range Latching shutdown If the output current rises above the rated value and above the current limit the device reduces the output voltage see e g Figure 6 9 Output characteristic curve 6EP3333 8SB00 0AY0 latching shutdown Page 43 If the output voltage falls below 20 V the device shuts down latching the red LED lights up This limit voltage of 20 V is independent of the s...

Page 17: ...vice design dimension drawing 2 5 Change over switch SITOP PSU8200 1ph Manual 11 2014 C98130 A7633 A1 3 7629 17 Delivery state A OFF B OFF Note Selector switches may only be activated when the device is switched off ...

Page 18: ...ntacts 15 16 Non isolated input for remote ON OFF switching of the power supply Function The device is remotely switched off when contacts 15 16 are short circuited R 8 kΩ If the power supply is shut down and latched in the latching shutdown mode as a result of an overload then it can be restarted using remote OFF followed by remote ON Figure 2 9 Remote contact for 6EP3333 8SB00 0AY0 and 6EP3334 8...

Page 19: ...ription device design dimension drawing 2 7 Block diagram SITOP PSU8200 1ph Manual 11 2014 C98130 A7633 A1 3 7629 19 2 7 Block diagram Figure 2 10 Block diagram for 6EP3333 8SB00 0AY0 and 6EP3334 8SB00 0AY0 ...

Page 20: ...Description device design dimension drawing 2 7 Block diagram SITOP PSU8200 1ph 20 Manual 11 2014 C98130 A7633 A1 3 7629 Figure 2 11 Block diagram for 6EP1336 3BA10 ...

Page 21: ... dimension drawing 2 8 Dimensions and weight SITOP PSU8200 1ph Manual 11 2014 C98130 A7633 A1 3 7629 21 2 8 Dimensions and weight Figure 2 12 Dimension drawing 6EP3333 8SB00 0AY0 Figure 2 13 Dimension drawing 6EP3334 8SB00 0AY0 ...

Page 22: ...200 1ph 22 Manual 11 2014 C98130 A7633 A1 3 7629 Figure 2 14 Dimension drawing for 6EP1336 3BA10 6EP3333 8SB00 0AY0 24 V 5 A 6EP3334 8SB00 0AY0 24 V 10 A 6EP1336 3BA10 24 V 20 A Dimensions W H D in mm 45 125 125 55 125 125 90 125 120 Weight approx 0 8 kg approx 1 0 kg approx 1 2 kg ...

Page 23: ...standard mounting rails according to EN 60715 Mounting To mount the device position it with the mounting rail guide at the upper edge of the standard mounting rail and press down to lock it into place If this is too difficult press slider at the same time as described under Removal Removal To remove pull up the slider using a screwdriver and disengage the device at the bottom edge of the standard ...

Page 24: ...1 2014 C98130 A7633 A1 3 7629 WARNING Use in hazardous zones If the devices are to be used in hazardous zones II 3G Ex nA nC IIC T3 Gc or II 3G Ex nA nC IIC T4 Gc they must be installed in a distribution box with degree of protection IP54 or higher ...

Page 25: ...such a way that the input terminals and the output terminals are at the bottom to ensure correct cooling A clearance of at least 50 mm should be maintained above and below the device maximum depth of the cable duct 50 mm No space is required at the side Output current as a function of the ambient temperature and mounting height Figure 4 1 6EP3333 8SB00 0AY0 standard mounting position Figure 4 2 6E...

Page 26: ...learances 4 1 Standard mounting position SITOP PSU8200 1ph 26 Manual 11 2014 C98130 A7633 A1 3 7629 Figure 4 3 6EP1336 3BA10 standard mounting position Figure 4 4 Mounting height derating For details see Ambient conditions Page 53 ...

Page 27: ...d in accordance with the following diagrams Note In the case of mounting positions that deviate from the standard mounting position reduced mechanical resistance of the devices against vibration and shock must be expected Particularly when installing on a vertically fastened standard mounting rail additional measures may be required e g to prevent the device from slipping on the standard mounting ...

Page 28: ... 4 2 Other mounting positions SITOP PSU8200 1ph 28 Manual 11 2014 C98130 A7633 A1 3 7629 Figure 4 7 6EP3333 8SB00 0AY0 mounting position 3 Figure 4 8 6EP3333 8SB00 0AY0 mounting position 4 Figure 4 9 6EP3333 8SB00 0AY0 mounting position 5 ...

Page 29: ...nting positions SITOP PSU8200 1ph Manual 11 2014 C98130 A7633 A1 3 7629 29 4 2 2 6EP3334 8SB00 0AY0 Figure 4 10 6EP3334 8SB00 0AY0 mounting position 1 Figure 4 11 6EP3334 8SB00 0AY0 mounting position 2 Figure 4 12 6EP3334 8SB00 0AY0 mounting position 3 ...

Page 30: ...tion mounting clearances 4 2 Other mounting positions SITOP PSU8200 1ph 30 Manual 11 2014 C98130 A7633 A1 3 7629 Figure 4 13 6EP3334 8SB00 0AY0 mounting position 4 Figure 4 14 6EP3334 8SB00 0AY0 mounting position 5 ...

Page 31: ... Other mounting positions SITOP PSU8200 1ph Manual 11 2014 C98130 A7633 A1 3 7629 31 4 2 3 6EP1336 3BA10 Figure 4 15 6EP1336 3BA10 mounting position 1 Figure 4 16 6EP1336 3BA10 mounting position 2 Figure 4 17 6EP1336 3BA10 mounting position 3 ...

Page 32: ... position mounting clearances 4 2 Other mounting positions SITOP PSU8200 1ph 32 Manual 11 2014 C98130 A7633 A1 3 7629 Figure 4 18 6EP1336 3BA10 mounting position 4 Figure 4 19 6EP1336 3BA10 mounting position 5 ...

Page 33: ...ury 5 1 Line side connection The SITOP PSU8200 1ph 6EP3333 8SB00 0AY0 and 6EP3334 8SB00 0AY0 power supply is designed for connection to a 1 phase AC line supply with a rated voltage of 120 230 V AC 50 60 Hz Figure 5 1 Line connection for 6EP3333 8SB00 0AY0 and 6EP3334 8SB00 0AY0 SITOP PSU8200 1ph 6EP1336 3BA10 power supplies are designed to be connected to a 1 phase AC line voltage or to 2 line co...

Page 34: ...s the only protective measure This applies for the complete line supply protected by the ground fault circuit interrupter Protection SITOP PSU8200 1ph Line side protection 6EP3333 8SB00 0AY0 24 V 5 A Recommended Miniature circuit breaker IEC 898 characteristic C 6 A 6EP3334 8SB00 0AY0 24 V 10 A Recommended Miniature circuit breaker IEC 898 characteristic C 10 A 6EP1336 3BA10 24 V 20 A Recommended ...

Page 35: ...34 8SB00 0AY0 The output voltage is connected via the and terminals at the output of the power supply see Figure 5 3 Output connection example 6EP3334 8SB00 0AY0 Page 35 Ensure that the output cables are dimensioned correctly for the maximum output current rms value and fused accordingly Note If the safety concept of the plant or system specifies that the DC output circuit should be grounded PELV ...

Page 36: ...Installation 5 2 Output side connection SITOP PSU8200 1ph 36 Manual 11 2014 C98130 A7633 A1 3 7629 ...

Page 37: ... 264 V Automatic current switchover 85 132 170 264 V Automatic current switchover 85 275 V Temperature derating for Ue 100 V for 50 C necessary Voltage range for DC Remark 88 350 V Temperature derating for Ue 100 V for 50 C necessary Wide range input No No Yes Overvoltage strength 2 3 Ue rated 1 3 ms Power failure buffering at Ia rated min at 230 V 35 ms 35 ms 20 ms Rated line frequency 50 60 Hz 5...

Page 38: ...ne feeder cable IEC 898 Recommended Miniature circuit breaker IEC 898 characteristic C 6 A Recommended Miniature circuit breaker IEC 898 characteristic C 10 A Recommended miniature circuit breaker for single phase operation 10 A char acteristic C required for two phase operation Miniature circuit breaker two pole coupled or circuit breaker 8 or 4 A according to UL 489 3RV2711 1HD10 120 V or 3RV271...

Page 39: ...x 480 W Operating display LED green for 24 V O K LED green for 24 V O K LED green for 24 V O K Signaling Relay contact NO contact rating 60 V DC 0 3 A for 24 V O K Relay contact NO contact rating 60 V DC 0 3 A for 24 V O K Relay contact NO contact contact rating 60 V DC 0 3 A 30 V DC 1 A for 24 V O K Response when switching on off Overshoot of Ua approx 3 Overshoot of Ua approx 3 No overshoot of U...

Page 40: ...in 25 ms per 1 min Can be connected in parallel to increase the power rating Remark Yes Switchable characteristic Yes Switchable characteristic Yes Switchable characteristic Number of devices that can be connected in parallel to increase the power rating units 2 2 2 Output characteristic See Figure 6 3 Output char acteristic curve 6EP3333 8SB00 0AY0 stand alone operation Page 41 See Figure 6 4 Out...

Page 41: ...00 0AY0 stand alone operation Figure 6 4 Output characteristic curve 6EP3334 8SB00 0AY0 stand alone operation Figure 6 5 6EP1336 3BA10 single operation output characteristic The device supplies a constant output voltage until the current limit is reached In the event of an overload the output current and the output voltage are reduced ...

Page 42: ...h A on parallel operation The output voltage falls with increasing output current Figure 6 6 Output characteristic curve 6EP3333 8SB00 0AY0 parallel operation Figure 6 7 Output characteristic curve 6EP3334 8SB00 0AY0 parallel operation Figure 6 8 6EP1336 3BA10 parallel operation output characteristic ...

Page 43: ... a minimum of 60 s or remote OFF and ON at the remote contact 6EP1336 3BA10 is reset using power supply OFF for a minimum of 5 s or remote OFF and ON at the remote contact 6EP1336 3BA10 is reset by switching off the power supply for longer than 5 s Figure 6 9 Output characteristic curve 6EP3333 8SB00 0AY0 latching shutdown Figure 6 10 Output characteristic curve 6EP3334 8SB00 0AY0 latching shutdow...

Page 44: ...AY0 24 V 10 A 6EP1336 3BA10 24 V 20 A Efficiency at Ua rated Ia rated approx 93 94 93 Power loss at Ua rated Ia rated approx 9 W 18 W 42 W No load operation power loss approx 1 5 W 1 5 W 10 W Power loss in the latching shut down state 1 2 W 1 2 W 6 5 W Figure 6 12 Power efficiency 6EP3333 8SB00 0AY0 Figure 6 13 Power efficiency 6EP3334 8SB00 0AY0 ...

Page 45: ... V 10 A 6EP1336 3BA10 24 V 20 A Dyn line regulation Ue rated 15 max 0 1 0 1 1 Dyn load regulation Ia 50 100 50 Ua typ 2 4 1 Load step regulation time 50 to 100 typ 250 µs 250 µs 1 ms Load step regulation time 100 to 50 typ 500 μs 500 μs 1 ms Regulation time maximum 1 ms 1 ms 5 ms Dyn load regulation Ia 10 90 10 Ua typ 2 Load step regulation time 10 to 90 typ 1 ms Load step regulation time 90 to 10...

Page 46: ...low LED for overload red LED for latching shutdown 6 6 MTBF 6EP3333 8SB00 0AY0 24 V 5 A 6EP3334 8SB00 0AY0 24 V 10 A 6EP1336 3BA10 24 V 20 A Mean Time Between Failures SN29500 1200000 hours at 40 C rated load 24 hour operation SN29500 620000 hours at 40 C rated load 24 hour operation 6 7 Mechanical system 6EP3333 8SB00 0AY0 24 V 5 A 6EP3334 8SB00 0AY0 24 V 10 A 6EP1336 3BA10 24 V 20 A Connection s...

Page 47: ...n be snapped onto stand ard EN 60715 35x7 5 15 mounting rails Can be snapped onto stand ard EN 60715 35x7 5 15 mounting rails 6 8 Accessories 6EP3333 8SB00 0AY0 24 V 5 A 6EP3334 8SB00 0AY0 24 V 10 A 6EP1336 3BA10 24 V 20 A Electrical accessories Buffer module redundancy module Mechanical accessories Device identification label 20mm 7mm Ti grey 3RT2900 1SB20 6 9 Dimension drawing See Section Dimens...

Page 48: ...Technical data 6 9 Dimension drawing SITOP PSU8200 1ph 48 Manual 11 2014 C98130 A7633 A1 3 7629 ...

Page 49: ...imary secondary galvanic isolation Yes Electrical isolation SELV output voltage Ua according to EN 60950 1 and EN 50178 Protection class Class I Degree of protection EN 60529 IP20 Leakage current typ 1 mA Leakage current max 3 5 mA Test voltage See Table 7 1 Test voltage for 6EP3333 8SB00 0AY0 and 6EP3334 8SB00 0AY0 Page 50 and Table 7 2 Test voltage for 6EP1336 3BA10 Page 51 ...

Page 50: ...erminals signaling contact and PE with one another Test C Connect the output terminals and signaling contact with one another and measure with respect to PE Table 7 1 Test voltage for 6EP3333 8SB00 0AY0 and 6EP3334 8SB00 0AY0 Test time Prim sec A Prim PE B Sec PE C Type test 60 s 4200 VDC 2200 VDC 700 VDC 60 s 3000 VAC 1500 VAC 500 VAC Production test 1 s 4200 VDC 4200 VDC 500 VDC 1 s 3000 VAC 300...

Page 51: ...rrent for AC measurement 100 mA 7 3 Approvals 6EP3333 8SB00 0AY0 24 V 5 A 6EP3334 8SB00 0AY0 24 V 10 A 6EP1336 3BA10 24 V 20 A CE marking Yes 2004 108 EG and 2006 95 EG Yes 2004 108 EG and 2006 95 EG UL cUL CSA approval cULus Listed UL 508 CSA C22 2 No 107 1 File E197259 cULus Listed UL 508 CSA C22 2 No 107 1 File E197259 Explosion protection EPS 12 ATEX 1 640 X IECEx EPS 14 0057X II 3G Ex nA nC I...

Page 52: ...ltages EN 61000 4 5 3 kV symmetrical at the line supply connections 6 kV symmetrical at the line supply connections 500 V symmetrical asymmetrical on DC output cables 3 kV symmetrical at the line supply connections 5 kV asymmetrical at the line supply connections 500 V symmetrical asymmetrical on DC output cables High frequency fields EN 61000 4 6 10 V 0 15 80 MHz 10 V 0 15 80 MHz Magnetic fields ...

Page 53: ... of pollution 2 Mechanical stressing during operation Tested according to EN 60068 2 6 vibration test Fc 7 mm deflection in the range 5 8 4 Hz 2 g acceleration in the range 8 4 150 Hz EN 60068 2 27 shock test Ea Acceleration 150 m s2 test duration 11 ms Damaging gases Tested according to EN 60068 2 42 sulfur dioxide EN 60068 2 43 hydrogen sulfide Atmospheric pressure Operation 1080 795 hPa 1000 20...

Page 54: ......

Page 55: ...ted in parallel must be switched on simultaneously with a common switch in the line feeder cable e g with the main switch available in control cabinets The output voltages measured in no load operation for the power supplies that are not yet connected in parallel should not deviate more than a maximum of 50 mV This usually corresponds to the factory setting If the output voltage is changed you sho...

Page 56: ...han two power supplies When connecting more than two power supplies in parallel additional measures must be taken to prevent high backward feeding currents in the event of a secondary device fault For this purpose a suitable protective circuit e g decoupling diode or DC conform circuit breaker must be installed between each terminal of the power supply and the common connection point ...

Page 57: ...es fails then the other automatically takes over the power supply If one of the power supplies fails then this is signaled using an LED on the redundancy module as well as an isolated relay contact When dimensioning the system it must be ensured that n 1 redundant connected power supplies can handle the total power requirement of the remaining n power supplies Note For a high reliability of the su...

Page 58: ...upply The terminal of the first power supply and the terminal of the second power supply are routed to the load Depending on the grounding point of the secondary output voltages voltages of 48 V 24 V or 48 V can be realized In the case of an asymmetric load distribution it is not possible to guarantee correct functionality WARNING SELV is not guaranteed in the case of a fault When connecting two p...

Page 59: ... output current range for each output from 0 5 3 A and 3 10 A is available for this purpose this monitors the 24 V branches for overload and short circuit Figure 9 4 Electronic protection of 24 V consumers with the SITOP PSE200U selectivity module Page 59 Brief current peaks e g as a result of a high inrush current are permitted and branches with a longer overload are switched into a no current co...

Page 60: ...increase the line buffering time in the device using an additional SITOP PSE201U buffer module The SITOP PSE201U buffer module based on electrolytic capacitors is connected in parallel to the 24 V power supply output Figure 9 5 Buffering brief power failures using the SITOP PSE201U buffer module Page 60 The buffer time is 200 ms at 40 A up to 1 6 s for a load current of 5 A This time can be increa...

Page 61: ...er supply failures up into the minutes range can be buffered using the maintenance free SITOP UPS500 DC UPS modules based on capacitors Figure 9 6 24 V buffering to allow the saving of process data and controlled shutdown of PCs Page 61 Figure 9 6 24 V buffering to allow the saving of process data and controlled shutdown of PCs Using the free of charge SITOP DC UPS software tool DC UPS systems can...

Page 62: ...600 to maintain communication signaling functions sensor measured values and position values For open PC based automation systems configuration and monitoring is realized using the SITOP UPS Manager PC software which is available at no charge This allows PC responses to the operating states of the DC UPS to be freely selected and offers comprehensive diagnostic functions For TIA based automation s...

Page 63: ... Environment 10 The devices are in conformance with RoHS As a rule only non silicon precipitating materials are used Disposal guidelines Packaging and packaging aids can and should always be recycled The product itself may not be disposed of as domestic refuse ...

Page 64: ...Environment SITOP PSU8200 1ph 64 Manual 11 2014 C98130 A7633 A1 3 7629 ...

Page 65: ...lies is available in the Internet at the SITOP homepage SITOP http www siemens de sitop Information material SITOP information can be downloaded from the Internet Information and download center http www siemens de sitop infomaterial CAx data 2D 3D data and circuit diagram macros can be downloaded from the Internet Siemens image database http www siemens de sitop cax Request all CAx data via the C...

Page 66: ... 7629 Contact persons If you have any questions regarding the use of our products then contact the Siemens contact person in your regional Siemens sales office You can find these addresses as follows On the Internet http www siemens de automation partner In Catalog CA 01 ...

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