Question 1

What is the difference between SD and SDE for Compact NSX?

Accepted Answer

SD (trip indication) and SDE (fault-trip indication) are the indication contacts for compact NSX, but the function for trip are different.SD (trip indication) indicates that the circuit breaker has tripped due to: an overloada short-circuitan earth fault (Vigi) or a ground fault (Micrologic 6)operation of a voltage releaseoperation of the "push to trip" buttondisconnection when the device is ON. The SD contact returns to de-energised state when the circuit breaker is reset. SDE (fault-trip indication) indicates that the circuit breaker has tripped due to: an overloada short-circuitan earth fault (Vigi) or a ground fault (Micrologic 6). ComPacT NSX100/160/250 circuit breakers and switch-disconnectors ComPacT NSX400/630 circuit breakers and switch-disconnectors

Question 2

What is the Tightening Torque on the Compact NSX for Lugs or Bars?

Accepted Answer

Tightening Torque on the Compact NSX for Lugs or Bars has a separated Tightening Torque for NSX100, NSX160/250 and NSX400/630.Please find the table below for Tightening Torque on the Compact NSX .

Question 3

Register list for Powerlogics PM2000 series

Accepted Answer

Please find the Register list for PM2000 series as attachment below.PM2000 Series Register List

Question 4

Tripping curves - Acti 9 breakers

Accepted Answer

The following curves show the total fault current breaking time, depending on its amperage. For example: based on the curve on page 3, an iC60 circuit breaker of curve C, 20 A rating, will interrupt a current of 100 A (5 times the rated current In) in:- 0.45 seconds at least- 6 seconds at most.The circuit breakers’ tripping curves consist of two parts:- tripping of overload protection (thermal tripping device): the higher the current, theshorter the tripping time- tripping of short-circuit protection (magnetic tripping device): if the current exceeds the threshold of this protection device, the breaking time is less than 10 milliseconds. For short-circuit currents exceeding 20 times the rated current, the time-current curves do not give a sufficiently precise representation. The breaking of high short circuit currents is characterized by the current limiting curves, in peak current and inenergy. The total breaking time can be estimated at 5 times the value of the ratio (I2t)/(Î)2. Verification of the discrimination between two circuit breakersBy superimposing the curve of a circuit breaker on that of the circuit breaker installed upstream, one can check whether this combination will be discriminating in cases of overload (discrimination for all current values, up to the magnetic threshold of the upstream circuit breaker). This verification is useful when one of the two circuit breakers has adjustable thresholds; for fixed-threshold devices, this information is provided directly by the discrimination tables.To check discrimination on short circuits, the energy characteristics of the two devices must be compared.Verification of the discrimination between two circuit breakersBy superimposing the curve of a circuit breaker on that of the circuit breaker installed upstream, one can check whether this combination will be discriminating in cases of overload (discrimination for all current values, up to the magnetic threshold of the upstream circuit breaker). This verification is useful when one of the two circuit breakers has adjustable thresholds; for fixed-threshold devices, this information is provided directly by the discrimination tables.To check discrimination on short circuits, the energy characteristics of the two devices must be compared.

Question 5

Motor Mechanism (MCH) Instruction Manual sheets (Compact NSX 100-630)

Accepted Answer

You could find instruction sheets for Motor Mechanism (MCH) for Compact NSX 100-630 as attachments.

Question 6

What is the default password of Schneider UPS Monitoring Software?

Accepted Answer

Schneider UPS Monitoring Software used to monitor the Easy UPS SRV status and configure Shutdown settings, events, connected operating systems. When you install for the first time. you have to fill the default password and change later. (Default User Name is administrator) Default password: administrator Refer FAQ : คู่มือการใช้งาน UPS Monitoring softwarehttps://www.se.com/th/th/faqs/FA400013/

Question 7

What are Thermal-magnetic or electronic trip unit?

Accepted Answer

Thermal-magnetic trip units protect against overcurrents and short-circuits using tried and true techniques. But today, installation optimisation and energy efficiency have become decisive factors and electronic trip units offering more advanced protection functions combined with measurements are better suited to these needs. When there is an overload, the increased current flow heats the bimetal and causes it to bend. As the bimetal bends, it touches and rotates the trip bar causing the circuit breaker to tripMicrologic electronic trip units combine reflex tripping and intelligent operation. Thanks to digital electronics, trip units have become faster as well as more accurateand reliable. Wide setting ranges make installation upgrades easier. Designed with processing capabilities, Micrologic trip units can provide measurement informationand device operating assistance. With this information, users can avoid or deal more effectively with disturbances and can play a more active role in system operation.They can manage the installation, anticipate on events and plan any necessary servicing.

Question 8

What does IEC 60947 Standards for low-voltage switchgear and controlgear mean?

Accepted Answer

IEC 60947-2 has been around a while. Originally called IEC 947-2, it got its current name way back in 1997. So, you may wonder, why talk about it now?Let’s say a timely reminder is about due.Substandard circuit breakers galoreElectrical distribution has become an ever more important part of our daily lives. More and more people worldwide are enjoying comfortable, device-driven lifestyles, while business and industry in developed and developing economies are dependent on ICT and always available power.And if electrical distribution pervades every aspect of work, play, and travel, so, too, do circuit breakers. But not all circuit breakers qualitatively comply with IEC 60947. And in fact, today’s deregulated, fast-changing global market is flooded with billions that don’t. That spells trouble for end-users – both domestic and industrial.Circuit breakers the basic building block of electrical safetyCertified, conformity-assessed, standard-compliant devices last decades. circuit breakers in switchboards operate for 10 to 15 years at a time, for example. Low-price, substandard – rather, standardless! – circuit breakers may work for a while. But not much longer. When – rather than if – they fail, the cost may be high. Money, time and – above all – lives may be lost.Lest we forget: the circuit breaker affords essential protection against short-circuits and overcurrent. They prevent fire.In fact, I like to call circuit breakers the basic building block of electrical protection. Of course, some countries also require other kinds of mandatory safety devices. Devices that prevent and protect against earth leakage, electrocution, and the damage caused by surges.The humble circuit breakerCompounding the problem of the market flooded with substandard circuit breakers is one of ignorance of, and even disregard for, the humble circuit breaker.End users may be forgiven for not caring too much about the technical niceties of circuit breakers. I admit, it’s not their concern even though it might eventually become their problem. Design engineers and general contractors, however, should have in-depth knowledge of circuit breakers and standard IEC 60947 2, which governs their specifications.And if the tech specs are clear and standards-based, then end-users, too, will benefit. They’ll know what their circuit breaker is supposed to do and what it does do.Circuit breaker casings tell you what they doClearly, then, it is critical to select the right circuit breaker. The right choice is a reliable one that should be fit not just for general purpose, but should also meet the specifications for the application in hand. Modular Circuit Breakers marking examples basing on requirements in IEC/EN 60947-2 IEC 60947 2 requires circuit breakers to have information printed on the outside. The more there is, the better the device, and the more you will know about what it does. It is information like: • Rated current (should always show, even when the circuit breaker is installed) • Manufacturer’s trademark • Compliance with standard IEC/EN 60947-2 • Selectivity category • Rated voltage • Rated impulse withstand voltage • Rated short circuit making capacity • Rated short-circuit breaking capacity • Reference temperature (if different from 30°C) • Pollution degree • Rated insulation voltage • Suitability for isolation (should show even when circuit breaker is installed) • Clearly marked on and off positions (should show even when circuit breaker is installed)

Question 9

What is the selection criterion of Circuit Breakers for the Capacitor bank application.

Accepted 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. The Derating factor of 1.5In Where In = Q/ ( Square root of 3 ) Un Q = Capacitor Power Un = Nominal Voltage Choose the Micrologic with delay time selection, so that the Circuit Breaker does not trip due to initial high inrush current. Also to be taken into account are the parameters like supply frequency, operating voltage & harmonics level of the power system for such application. Refer the attached sheet for further details for selection of Circuit Breaker for Capacitor duty application. Note: Use the phase barrier between the phases in Circuit Breaker to prevent flashover due to heavy inrush current.

Question 10

Why is Neutral and Earth (Ground) Connection forbidden Downstream from Main Panel?

Accepted Answer

The question is often asked what is the maximum voltage permitted between the Neutral and Earth (Ground) conductor and if the Neutral and Earth can be bridged to achieve a zero value.This can be a difficult topic, in fact in many cases it can be dangerous. As you will see from the attached document, there are many reasons why it is not allowed.

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