Posts Tagged ‘low voltage’

Low Voltage AC drives – their characteristics & their applications

August 25th, 2014 | Make a comment | Posted in Electrical distribution
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Hello, it’s Steven Mill! What do you know about LV AC drives? Let me tell a few words about it…

What are AC Drives?

There are adjustable speed drives that control the speed of DC and AC motors. The speed of an AC motor is determined mostly by two factors i.e. the frequency applied and the number of poles. So the formula goes as:

Low Voltage AC drives 1


  • N = RPM
  • F = frequency
  • P = no. of poles


Low Voltage Circuit Breakers

January 13th, 2014 | 1 Comment | Posted in Electrical distribution
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Check the fifth part of Nasir’s tutorial on Circuit Breakers:

One of the major classifications of circuit breakers is based on the voltage levels they operate on. On this basis we classify the circuit breakers into two main types, which are:

  1. High Voltage Circuit Breakers
  2. Low Voltage Circuit Breakers

Voltage Threshold

In this article I am going to discuss the Low Voltage circuit breakers. So the first question which arises is that why are the low voltage circuit breakers known so? This is because they operate on low voltages, and the threshold voltage for their classification is 1000 volts.

The circuit breakers which operate on voltages less than 1000 volts are known as low voltage circuit breakers. On the other hand, high voltage circuit breakers are completely opposite to them which will be discussed further in the next articles.

Low voltage circuit breakers are shown in the figure below:

Low Voltage Circuit Breakers 1


Buck Boost Transformer

May 10th, 2013 | 3 Comments | Posted in Electrical distribution
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Buck Boost Transformer 1

Buck Boost Transformer comes under the class of transformers whose main function is to alter the amount of voltage being received by various alternating current appliances and devices as per their requirement. The uninterruptible power supply (UPS) technology, being widely used mostly in the computer industry, and the technology used in the tanning beds are based on the buck booster transformer technology.

If a device or piece of equipment receives the amount of voltage greater or less than its requirement then there are chances that it may get damaged, overheat, show poor performance and last but not the least loose its functioning much before time. So to avoid all these things from happening to our device it is advisable to use the buck-boost transformer tech.

Voltage circuits requiring low power voltage such as control, lighting circuits or applications running on 12, 16, 24, 32 or 48V are also liable to be powered through buck boost transformer. The transformer’s capacity is mentioned on the nameplate in the form of kVA rating.


IEC 61439 : frequently asked questions (part 4)

November 25th, 2009 | Make a comment | Posted in Panel Building
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link to IEC web site
Answer to a question asked by Joy in another post, which I copied here :

“Does the new standard , require the panel builder to supply only ,the same branded circuit breakers ,which were used on the type tested assembly in their client panels ?

Is so , doesn’t it limit the available options for the panel builder as he will be restricted with only one brand of circuit breakers for all his future projects?” (more…)

New IEC 61439: what impacts for you today?

October 26th, 2009 | Make a comment | Posted in Panel Building
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The articles I already wrote about the new IEC61439-2 standard for LV switchboards are among the most visited parts of my blog. But I still wonder what are the practical impacts of this new standard for you, in your country, and today? (more…)

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