How to connect the voltage control relay RKN 3-15-15 in a three-phase circuit?

  • Mar 03, 2021
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This is exactly what the title of the question from the reader Anatoly sounded like.

I continue to publish the questions that readers asked me. For new dear readers who came to my channel for the first time, I would like to inform you that this is already 25 such publication. You can familiarize yourself with some other questions and answers to them by clicking on the links at the bottom of this article.

The text of the question from Anatoly itself was quite simple and sounded like this:

Good day! Please tell me how to connect the voltage control relay RKN 3-15-15 to a three-phase circuit?

I gave the following answer to this question:

Hello, when connecting any relay, you must use the passport data of the device or the manufacturer's instructions. To connect the voltage monitoring relay RKN 3-15-15 in a three-phase circuit, the following diagram is used.

Phase conductors of the corresponding phases are connected to the terminals of the voltage monitoring relay L1, L2, L3. A neutral conductor must be connected to the N terminal according to the requirements of the device passport.

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When voltage is applied to the input terminals, the relay checks its compliance with the monitored parameters:

  • The presence of voltage in all three phase conductors;
  • The voltage value is within the specified limits;
  • The phase sequence is as specified;
  • There is no breakage or "sticking" of phase conductors;
  • There is no break in the neutral conductor.

If the voltage parameters meet the above criteria, the RKN 3-15-15 relay will transfer contacts 11-14 and 21-24 to the on position. A starter or contactor is connected to the terminals of these clamps for switching a three-phase load. In this example, switching is made from terminals 11 - 14, and terminals 21 - 24 are used to supply the signaling circuits. But this pinout is not critical; if you wish, you can swap them or use only one pair.

In the event of a malfunction, depending on its nature, the voltage monitoring relay will either turn on the corresponding indicator or open the contacts of terminals 11 - 14.

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P.S. Link to some past parts - Part 24, Part 23, Part 22, Part 21, Part 20.