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What does Internal Arc Classification A-F, A-FL and A-FLR mean?

Internal Arc Classification IAC A-F, A-FL and A-FLR are defined in IEC 62217-200 and help to define internal arc performance of medium voltage or high voltage switchgear. The following definitions...

What is the difference between Class 0.5 and Class 0.5s for Current...

For Current Transformers: Class 0.5s is more accurate when you got low values of current. For class 0.5s and with a current between 1-5% In, you got on class 0.5s a 0.75% error. For class 0.5 and...

What is the maximum earth loop Impedance Zs value for the circuit breakers...

The maximum earth loop Impedance figures can be found on the attached pdf files. 16A to 250A The standard MCCB's used for ratings of 16A to 250A with part numbers beginning with...

What are the coil voltage codes used for contactors and relays?

Schneider Electric Industrial Control (Previously Telemecanique) voltage codes are a 2 character code added to the end of a part number. The first character indicates the voltage, the second...

How do I update my Smart-UPS firmware using the web interface of my...

Issue: Because the Firmware Upgrade Wizard is the most universal and preferred method of updating, we recommend using the APC Firmware Upgrade Wizard whenever possible. The APC Firmware Upgrade...

What is the definition of the dials/ selector switches of the Micrologic...

Standard IEC 60947-2 defines the names of the selector switches. The meanings of the screen-printed items on the selector switches of the trip units are: Ir: adjustment of the long time (or thermal)...

Which is the software to program the Modicon M241?

The software to program the Modicon M241 is EcoStruxure Machine Expert (former SoMachine). In order to install this software you need to download "Schneider Electric Software Installer"...

Why is the kW (Active Power) showing a negative reading on the Powerlogic...

A negative kW reading is usually due to one of 2 things The Current transformers (CT's) have been fitted onto the cable or busbar the wrong way round. The P1 side of the CT should be towards the...

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Apa alternatif replacement battery UPS SURT15KRMXLI jika APCRBC140 tidak...

Apa alternatif replacement battery UPS SURT15KRMXLI jika APCRBC140 tidak ready stock? ======================================================================= Untuk alternatifnya bisa menggunakan...

What is Power Factor Correction (PFC) - Does it help conserve energy?

Issue: What is Power Factor Correction (PFC) - Does it help conserve energy? Answer: Power Factor Correction (PFC) doesn't directly reduce the overall electric consumption of a device or system,...

What is an Electrical "Ground Loop" - How does it affect my equipment?

Issue: What is an electrical "ground loop" and how does it affect my equipment? Environment: Ground loops can occur in any situation where multiple electrical devices are interconnected,...

How to identify the M172 that I am using in the program?

In order to identify in our code which M172 model we are using we need to use the two (2) internal variables located in "Operators and blocks". The variables are Par_POLI (Polycarbonate...

Which is the software to program the Modicon M171O (Optimized)?

The software to program the Modicon M171O (optimized) is EcoStruxure Machine Expert HVAC. The software can be downloaded from our website:...

Voltage, Current and Resistance Explained

Issue: How do I remember the relationship of voltage, current and resistance in an electrical system? Environment: N/A Solution: Voltage (unit of measurement - volt) is like the water pressure in the...

What is the difference between PNP and NPN when describing 3 wire...

Most industrial proximity sensors (inductive, capacitive, ultrasonic and photo electric) are solid state. The term solid state refers to the type of components used within the sensor. Solid state...

What are the differences between 220VAC, 230VAC and 240VAC Mains Supplies...

For many years, mainland Western Europe has used a mains electricity supply rated at nominally 220VAC 50Hz while the UK used 240VAC 50Hz. In 1994, the European Union state members decided to proceed...

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