Frequently Asked Questions — Schneider Electric

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" landing-cards-prop="{"getGk":[{"Title":"What is meant by Symmetrical and Asymmetrical breaking currents?","UrlName":"FAQ000219931","LastModifiedDate":"27/08/2025","products":"SF","score":1.7709790209790208,"firstpublisheddate":"30/09/2021","answer":"

issue:
Customer wants to know the value of the symmetrical and asymmetrical breaking current of the circuit breaker and what do they mean.

Environment:
Circuit Breaker

Resolution:
- Symmetrical breaking current is the RMS value of AC component of short circuit current at the instant of separation of the contacts. It does not take into account the DC offset.
- Asymmetrical breaking current is is the RMS value of the combined sum of the DC and AC components of the short circuit current at the instant of separation of the breaker contacts. This DC offset is of decaying nature which is dictated by the time constant of the system.

$\"image$

As shown in the above picture the DC offset decays in a few cycles and is left only with the symmetrical component. Hence if a breaker has to close before the DC component decays, then the breaker’s breaking capacity is to be calculated for the asymmetrical current at the time of breaking.

"},{"Title":"What is the selection criterion of Circuit Breakers for the Capacitor bank application.","UrlName":"FAQ000193301","LastModifiedDate":"28/02/2026","score":1.0681818181818181,"firstpublisheddate":"23/04/2010","answer":"

The selection should be done after derating the Circuit Breaker taking into consideration voltage variation and capacitors tolerances that could increase nominal current up to 1.5In.

\n\n

The Derating factor of 1.5In

\n\n

Where In = Q/ ( Square root of 3 ) Un

\n\n

Q = Capacitor Power

\n\n

Un = Nominal Voltage

\n\n

Choose the Micrologic with delay time selection, so that the Circuit Breaker does not trip due to initial high inrush current.

\n\n

Also to be taken into account are the parameters like supply frequency, operating voltage & harmonics level of the power system for such application.

\n\n

Refer the attached sheet for further details for selection of Circuit Breaker for Capacitor duty application.

\n\n

Note: Use the phase barrier between the phases in Circuit Breaker to prevent flashover due to heavy inrush current.

"},{"Title":"In a 3 phase system, why does the meter still show voltage reading on one of the phases even after breaking the phase circuit?","UrlName":"FAQ000133551","LastModifiedDate":"10/12/2024","score":1.0227272727272727,"firstpublisheddate":"30/12/2020","answer":"Issue:
Testing phase loss on a meter doesn't result in a null voltage reading.

Environmnet:
EasyLogic Series Power Meters
PowerLogic Series Power Meters

Resolution:
The voltage seen is what we call "phantom voltage", its a known phenomenon with all high impedance power meters. These phantom voltages are normal artifacts of the design and should not pose any safety concerns to the end user.

In some cases it'll probably disappear by power cycling the meter. Most power meters are not designed to monitor phase loss, as it'll always assume the presence of the 3 phases and the neutral, depending on your parameters setup. External devices are used to detect such occurrences, like phase control relays."},{"Title":"Which RL(lead resistance from CT to relay) is to be used in Knee Voltage calculation if Current Transformers (CTs) used in High Impedance Restricted Earth Fault are at different distances from relay?","UrlName":"FAQ000133320","LastModifiedDate":"28/11/2024","products":"Sepam series 80","score":0.5227272727272727,"firstpublisheddate":"30/12/2020","answer":"Issue:
Having two different values for RL ( Lead resistance from the CT to the relay); RL from the phase CT to the relay and RL from the neutral point CT to the relay

Environment:
Protection Function ANSI 64ref
High impedance differential
Sepam 80 Current Transformer requirement

Resolution:
In any application where the high impedance differential is used, all the CTs must have the following:
- the same ratio,
- the same magnetizing curve (same minimum Vk),
- the same maximum Rct (current Transformer secondary winding resistance),
- if the relevant CTs are not at the same distance from the relay, take the maximum RL.

Attached Cahier Technique no.194 for more information about high impedance calculation
"}],"getPv":[{"Title":"Video: How to upload Advantys island configuration(STB NIP ) through TCP/IP ?","UrlName":"FA334303","LastModifiedDate":"22/12/2025","products":"Modicon STB","score":1.0858408873700367,"firstpublisheddate":"20/12/2017","answer":"

Follow these steps to upload Advantys island configuration(STB NIP <example>) through TCP/IP.
1. Open the Advantys software and provide a new workspace & file name.
2. Go to online > Click connection settings.
3. Select connection type as TCP/IP and enter the IP address of Advantys STB NIP <example> module.
4. Then Click connect > Upload button to start uploading the configuration.

"},{"Title":"Video: What is meant by a fish-plate connection and what are its uses?","UrlName":"FA332592","LastModifiedDate":"01/02/2026","score":1.0190274841437632,"firstpublisheddate":"26/11/2017","answer":"This article contains a video"},{"Title":"Video: How to create a simple XML Web Service Interface in EBO server?","UrlName":"FA381928","LastModifiedDate":"19/09/2025","products":"EcoStruxure Building Operation","score":1.0190274841437632,"firstpublisheddate":"09/09/2019","answer":"

Web Services is a way to translate information in XML format so that it can be understood by EcoStruxure BMS servers and displayed in WorkStation. When you create a Web Service interface, you can add XML elements from the server providing the Web Service. The XML elements are then translated into values in an EcoStruxure BMS server.

\n\n

You create a Simple XML Web Service interface in the EcoStruxure Building Operation software so you can consume information from a Simple XML Web Service. The following video shows steps to create the XML web service interface:

\n"},{"Title":"Video: How to Configure Emergency Egress Function in Security Expert.","UrlName":"FA411621","LastModifiedDate":"19/09/2025","products":"Security Expert","score":1.0105708245243128,"firstpublisheddate":"19/08/2020","answer":"Issue:
Need to configure Emergency Egress function in Security Expert.

Product Line:
EcoStruxure Security Expert

Resolution:
Emergency Egress is a built in Programmable Function in EcoStruxure Security Expert. It is typically triggered by the fire alarm system within a building which is connected to the Security Expert system through any programmed input. Once activated, the function will immediately unlock all doors that are defined in the Emergency Egress door group and prevent anything from locking them again. When the fire alarm is reset, the Emergency Egress function secures all doors in the group.
Note: The Emergency Egress function is not intended to replace the emergency door release devices located at individual doors on the egress path, but instead to aid in an expeditious evacuation

The below video shows how to configure Emergency Egress in Securit Expert:

"},{"Title":"How to put MCset cubicle in earthed position?","UrlName":"FA367282","LastModifiedDate":"18/12/2024","products":"MCSet 17.5 kV, MCSet 24 kV","score":1.0105708245243128,"firstpublisheddate":"08/04/2019","answer":""},{"Title":"How to put MCset circuit breaker in test position?","UrlName":"FA367277","LastModifiedDate":"28/11/2024","score":1.0105708245243128,"firstpublisheddate":"08/04/2019","answer":"Watch the video to get the answer to your question:
"},{"Title":"What is the default passport for Easergy Thermal Sensors Connect App?","UrlName":"FAQ000218783","LastModifiedDate":"14/08/2025","products":"TH110","score":1.0084566596194504,"firstpublisheddate":"29/09/2021","answer":"Issue:
The default password for Easergy Thermal Connect Android App is Thermal-1.

Environment/Product line:
Easergy TH110

Resolution:
The default password for Easergy Thermal Connect Android App is Thermal-1.
Below video will be helpful if you want to install the Easergy Thermal Sensors Connect App.
https://www.youtube.com/watch?v=4wZoQLxQnNk
"},{"Title":"Video: How to extract Micom(P40 Relays) system file(.studioarch) from Easergy studio?","UrlName":"FAQ000224096","LastModifiedDate":"08/08/2025","products":"MiCOM P44x, MiCOM P54x, MiCOM P64x, MiCOM P34x, MiCOM P14x, MiCOM P24x","score":1.0084566596194504,"firstpublisheddate":"09/11/2021","answer":"

Title/Issue:
How to extract Micom(P40 Relays) system File(.studioarch) from Easergy studio

Product line:
Micom P40 relays

Resolution :
Please watch the below video to extract the studioarch file:

Kindly ensure to download the Easergy Studio software:https://www.se.com/in/en/download/document/Easergy_Studio_Installer/

& add the require data model after install the Easergy Studio software: https://www.se.com/eg/en/faqs/FA221295/

"},{"Title":"Video :How to compare the different SEPAM files in SFT2841?","UrlName":"FA400517","LastModifiedDate":"23/05/2025","products":"Sepam series 40, Sepam series 60, Sepam series 80, Sepam series 20","score":1.0084566596194504,"firstpublisheddate":"15/12/2019","answer":"

Issue :
Compare the different SEPAM files in SFT2841

Product Line:
Sepam relays

Resolution:
Below video helpful to compare the different SEPAM files with help of SFT2841 software

\n\n

Please download the SFT2841 software in our below SE website:
https://www.se.com/ae/en/download/document/Setup_Software_SFT2841/

"}],"getPa":[{"Title":"Please advice if RCCB 30mA sensitivity is enough for human safety or not?","UrlName":"FA328983","LastModifiedDate":"25/07/2022","products":"Vigi, DPN vigi, RCCB","score":1.004166382077727,"firstpublisheddate":"22/10/2017","answer":"Regarding the residual current devices ,are used mainly for human protection against direct and indirect contact,and they are defined by their sensitivity and interference immunity (type AC,A,SI and B).Please refer to catalog pages attached for the selection of the suitable type and some characteristics of these devices. "},{"Title":"What is the purpose of Line/Motor Choke ?","UrlName":"FA174401","LastModifiedDate":"20/03/2025","products":"MRCA/MRWA Mount","score":1.0039614780411175,"firstpublisheddate":"13/09/2013","answer":" \n

Reduction of overvoltages at motor terminals.
Reduction of current harmonics.
Extra Motor and Drive Protection by blocking Higher AC frequencies and Surge Currents.
Increasing the Lifetime of the Motor and Drive.
Extend Shielded/unshielded Cable length.
Filter interference caused by opening of a contactor placed between the filter and the motor.
Reduce the motor earth leakage current.
Motor Temperature Reduction.
Motor Noise Reduction.
Extra Short-Circuit Protection for Variable Speed Drive (VSD) Transistors to extend semiconductor life.

"},{"Title":"What is Meant by Rated Conventional thermal current of a Contactor ?","UrlName":"FA230658","LastModifiedDate":"20/03/2025","products":"Citect SCADA","score":1.0021792088724437,"firstpublisheddate":"21/12/2014","answer":"The conventional free air thermal current is the maximum value of test current to be used for temperature-rise tests of unenclosed equipment in free air. The value of the conventional free air thermal current shall be at least equal to the maximum value of the rated operational current of the unenclosed equipment in eight-hour duty. Free air is understood to be air under normal indoor conditions reasonably free from draughts and external radiation.
"},{"Title":"What are the definitions for \"Residual Earth Fault protection\" and \"Source Ground Return\" ?","UrlName":"FA284740","LastModifiedDate":"20/03/2025","products":"Ground Fault Protection Products, Vigirex","score":1.0019807390205586,"firstpublisheddate":"29/06/2016","answer":"please find below the definitions for "Residual Earth Fault protection" and "Source Ground Return"

1- Residual Earth Fault protection: The function determines the zero-phase sequence current, i.e. the vector sum of the phase and neutral currents

2-Source Ground Return :Using a special external sensor, this function directly
measures the fault current returning to the transformer via the
earth cable and It detects faults both upstream and downstream of the circuit
breaker.

Please note that it is recommended for Source Ground Return to consider:
1- The maximum distance between the sensor and the circuit breaker is ten meters
2- Use a 4P circuit breaker in order to isolate the neutral when the breaker is open and in order also to avoid the effect of the third harmonic which is flowing mainly on the neutral bar, and which could provoke unexpected tripping.

Kindly find attached guide for Ground fault protection, where you can find the following:

- page 18: for installation precautions.
- pages 34 to 36 :how to make choice concerning the GFP (Ground Fault protection) based on the installation conditions.
- page 37 to 51 wiring and Schneider offer according to GFP."},{"Title":"How to extract the MCL file and convert into CID/ICD file from Easergy Micom Px4x relays?","UrlName":"FA349625","LastModifiedDate":"06/05/2025","products":"MiCOM P14x, MiCOM P24x, MiCOM P34x, MiCOM P44x, MiCOM P54x, MiCOM P547, MiCOM P64x, MiCOM P740, MiCOM P746","score":1.0019124376750221,"firstpublisheddate":"30/05/2018","answer":"

Description:

Extract the MCL file and convert into CID/ICD file from Easergy Micom Px4x relays

Product family:

Easergy Micom Px4x relays

Resolution

Please find attached the procedure to extract MCL file & and convert into CID/IID file .

"},{"Title":"We are getting “NIC not fitted” in the Micom P642 events What is the meaning of this alarm?","UrlName":"FA377750","LastModifiedDate":"20/06/2025","products":"MiCOM P64x","score":1.0017075336384127,"firstpublisheddate":"02/07/2019","answer":"

Issue/description:

Meaning of getting “NIC not fitted” in the Easergy Micom P642 events

Product family:

Easergy Micom P642

Resolution:

This alarm means that Network Interface Card not fitted/failed. Please check the Network Interface Card & contact our local customer care with the below details for further investigation:

1) Micom system file i.e. .studioarch file included .Set .PSL ,log files(events, Disturbance records & fault records) &
Can you please arrange MCL file of unhealthy & healthy relay and complete network architecture directly extracted from the affected relays( (not in PDF format)

Thanks to share the below details also:
2) Hope your team checked the Ethernet board response through DOS command.
NIC No response is major alarm and it means Ethernet card is not responding.
Can you check and send some picture or video for both the port 1 & Port 2 during testing with rear ports.
3) Can you explain the problem in details ie. when/what condition this issue has appeared
4) Could you provide some data during fault (which relays, relays events) and network traces for deep investigation .

Above details are mandatory to investigate preliminary level further .

Describe in detail:
• Nature of the problem
• Approximate date/time when issue appeared
• Approximate date/time when troubleshooting and data collecting was done
• Tests already executed with the results
• Confirmation if captured frames are time synchronised with tested system
• List of devices with their IP addresses involved in the troubleshooting
• List of the files attached to help in the further investigation.
• Any observations which can help

Local customer care support's contact can find with the below SE link:
https://www.se.com/eg/en/work/support/customer-care/contact-schneider-electric.jsp

"},{"Title":"The Power/Heat Loss of iC60N MCBs & Vigi iC60 RCDs with catalogue pages.","UrlName":"FA233317","LastModifiedDate":"20/03/2025","products":"Spacial 3D","score":1.0017075336384127,"firstpublisheddate":"20/12/2014","answer":"Data required in the attached document .
"},{"Title":"Can we install Earth Fault protection for a Three pole ACB with micrologic 6 or 7 trip unit without external Neutral CT?","UrlName":"FA371215","LastModifiedDate":"20/03/2025","products":"IEC Rated Masterpact Circuit Breakers, Masterpact NW Remote Racking Device, Masterpact NW and NT Circuit Breakers with Arc Flash Protection","score":1.0015709309473397,"firstpublisheddate":"13/03/2019","answer":"There are two types of ground-fault protection:
1- Residual:
The function determines the zero-phase sequence current, i.e. the vector sum of the phase and neutral currents
2- Source Ground Return:
Using a special external sensor, this function directly measures the fault current returning to the transformer via the earth cable.

In case of 3 pole breaker (4-wire system), for ground-fault protection, it is mandatory to install an external CT for calculating the current to ground, thanks to a vectorial sum of phases and neutral currents. While for the 4 pole CB, it is not mandatory to install an external CT.
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