Question 1

What is the meaning of I2t ON (Max resettable time) and I2t OFF (Max break time) of Shot-time protection of Micrologic 2.0A/E, 5.0A/E, 6.0A/E and 7.0A

Accepted Answer

Short-time protection - The short-time protection function protects the distribution system against impedant short-circuits.- The short-time tripping delay can be used to ensure discrimination with a downstream circuit breaker.- This function carries out true rms measurements.- The I2t ON and I2t OFF options enhance discrimination with downstream protection devices.- Use of I2t curves with short-time protection: - I2t OFF selected: the protection function implements a constant time curve; - I2t ON selected: the protection function implements an I2t inverse-time curve up to 10 Ir. Above 10 Ir, the time curve is constant.- Zone selective interlocking (ZSI).The short-time and ground-fault protection functions enable time discriminationby delaying the upstream devices to provide the downstream devices the time required to clear the fault. Zone selective interlocking can be used to obtain total discrimination between circuit breakers using external wiring.Max resettable and max break times are the times linked to instantaneous protection.> Max resettable time is the time the breaker could withstand a fault before giving a tripping order.It means Max resettable time is the time during which a FAULT can appear, before the trip of the Circuit Breaker. > Max break time is the maximum time for the Circuit breaker and the Micrologic to eliminate the fault.It means Max break time it is the tripping time max including the global tripping chain of the circuit breaker.

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 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 8

ขนาดของตู้ และ ช่องเดินสายไฟ ของ ตู้ Square D Classic+ Consumer Unit

Accepted Answer

ตู้สแควร์ดีคอนซูมเมอร์ (Square D Consumer Unit : Classic) ตู้สแควร์ดี รุ่นคลาสสิค พลัส ตู้สำหรับอุปกรณ์ควบคุมไฟฟ้า 1 เฟส 2 สาย 240 โวลต์ พร้อมกราวด์บาร์ (GND)ตู้สแควร์ดี รุ่นคลาสสิค พลัส ดีไซน์ยอดเยี่ยม ทนทาน แข็งแกร่ง ปลอดภัยด้วยการออกแบบ และทดสอบตามมาตรฐาน IEC 61439-1,IEC 61439-3 และ มอก. 1436-2540 เหมาะสำหรับการติดตั้งสำหรับบ้านพักอาศัย ห้องชุด หรืออาคารพาณิชย์ ทุกรูปแบบ ทนกระแสลัดวงจร ได้ถึง 10 kA รองรับทุกการใช้งานแบบปลั๊กออน (Plug-on)1.แบบ ตู้สแควร์ดีคอนซูมเมอร์ Single Bus2.แบบ ตู้สแควร์ดีคอนซูมเมอร์ Split Bus 3.ขนาดของตู้ และ ช่องเดินสายไฟ ตู้สแควร์ดีคอนซูมเมอร์ 1.แบบ ตู้สแควร์ดีคอนซูมเมอร์ Single Bus • ขนาดบัสบาร์ 100 A• จำนวนวงจรย่อยของตู้คอนซูมเมอร์จะมีให้เลือกใช้ตั้งแต่ 4, 6, 10, 14, 18 วงจรย่อย2.แบบ ตู้สแควร์ดีคอนซูมเมอร์ Split Bus• คอนซูมเมอร์แบบแยกกลุ่ม กันดูด (Split Bus) มาพร้อม กับเมนเบรกเกอร์กันดูดปกป้อง 30 mA วงจรที่มีความเสี่ยงจากไฟดูด ไฟไม่ดับทั้งบ้าน• ขนาดบัสบาร์ 100 A• จำนวนวงจรย่อยของตู้คอนซูมเมอร์จะมีให้เลือกใช้ตั้งแต่ 4+4, 8+4, 8+8 วงจรย่อย 3.ขนาดของตู้ และ ช่องเดินสายไฟ ตู้สแควร์ดีคอนซูมเมอร์ สามารถต่อสายไฟเข้าด้านหลังตู้ได้ โดยสามารถเจาะรูเพื่อทำการเข้าสายได้จากตำแหน่งดังภาพ

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.

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