Today I had the arrival of last and significant piece of my puzzle.
I am impressed of what Chinese industry deliver for 1/3 of the price of what you get from International brands them also using China as manufacturing base.
The product LW28-20/3 ( GB14048.5 ) this is 7.5KW 15A AC-23 = inductive loads
Comes with certification.
I am going to use it about switching between two connectivity modes of VARIAC Transformer.
Mode 1: 0 ~ 230V = LINE connection
Mode 2: 0 ~270V = BOOST connection
These international brands are usually demands some quality production standards when they are choosing China for production (e.g. Apple , Sony Philips etc) Conversely purely Chinese brands doesnt follow these standards, thats why the lower cost and many times low reliability.
I am very close to support the contrary in 2017, China does not need paying for re-branded goods when their own production this is certified and tested according to domestic and international quality standards.
Additionally I will say that such specific products they do not aim consumers households, in such items for industrial use any product selection this is made from electrician engineers.
Regarding longevity (life cycle) not all electrical circuits are made for frequent manual control.
Specific product (switch ) this comes with supplied documentation this predicting life cycle at full power load and frequency of daily use.
In the end of the day, I did my selection by shopping for the appropriate item this able to handle one specific application, by me taking the time to select the appropriate item.
They are others (electrician installers) shopping industrial parts and be careless, and live by the hope that what ever they will order, this will be able to sustain crazy overloads and unlimited misuse.
Now because distance this is long ( China to Greece ) all that I am possibly missing this is product warranty in the event that this part suffering from production error issue.
I did my own inspection by measuring contacts resistance and I did not find any fault. WEB site http://www.glele.com/Product_show.aspx?cateID=1&id=168Product PDF in English http://www.glele.com/common/godownloads.ashx?id=168 Panel mount switch technical parameters ( AC-23 AC-22 AC-3) IEC 60947-3http://www.ittsb.eu/forum/index.php?topic=1252.0