+ Post New Thread
Results 1 to 9 of 9
  1. #1
    Advanced Member level 2
    Points: 3,290, Level: 13
    Achievements:
    Created Album pictures

    Join Date
    Dec 2013
    Location
    Sweden
    Posts
    558
    Helped
    8 / 8
    Points
    3,290
    Level
    13

    Bought a 230V@10A Variac for 90USD, was this cheap or expensive?

    Hello.

    I recently won an online auction for a variac rated:

    Primary: 230V
    Secondary: 3 - 250V
    Current: 10A
    Frequency: 50 - 60Hz
    Weight: 15,3kg
    Dimensions: 33*23*18 cm

    I don't know and can't really tell how good of a deal I made and I would be very happy with your opinion.
    Directly after the auction I started to think that maybe I have missed something because I got it for 766SEK(89.08USD/66.26GBP/75.19EUR) which I feel is almost weird, isn't that a very good deal?



    There are more pictures but I did't want to bother with them, I simply looking for you opinion regarding if you would regard this as a good deal or not.

    Regards

    •   Alt24th September 2017, 23:10

      advertising

        
       

  2. #2
    Super Moderator
    Points: 48,654, Level: 53
    Awards:
    Most Frequent Poster

    Join Date
    Apr 2014
    Posts
    9,971
    Helped
    2387 / 2387
    Points
    48,654
    Level
    53

    Re: Bought a 230V@10A Variac for 90USD, was this cheap or expensive?

    Hi,

    Does it have isolated output?

    Klaus



  3. #3
    Advanced Member level 2
    Points: 3,290, Level: 13
    Achievements:
    Created Album pictures

    Join Date
    Dec 2013
    Location
    Sweden
    Posts
    558
    Helped
    8 / 8
    Points
    3,290
    Level
    13

    Re: Bought a 230V@10A Variac for 90USD, was this cheap or expensive?

    I'm don't think so, I don't know if it refers to anything else but I know that this is in Swedish a "sparkopplad" transformer which appears to be translated simply as an auto-transformer.

    I didn't know that there where isolated variac's, I assume that you refer to whether or not it have an 230V - 230V isolation transformer already included in it?
    I have always thought that there where two separate things, an auto-transformer and a isolation-transformer and I have never even questioned whether both these may be found in one package.

    I don't think so but I will ask the seller, I will include the other two pictures as well because it includes the spec. plate. Will probably not get an answer today though as its past midnight here.



    - - - Updated - - -

    I can't load the PDF but I believe that this is a variety of the products shown on this page which doesn't indicate anything about any isolation.

    - - - Updated - - -

    The last row of the table on that page says "can also be supplied in a enclosure adhering to IP-23" which probably is what I am dealing with.

    - - - Updated - - -

    So to conclude, it most probably does not have isolated outputs.

    - - - Updated - - -

    Aha wait, I feel both rash and thick. But maybe the isolation you where asking about would be inherent in the transformer, a 230V primary and a separate secondary which is the output autotransformer...



    •   Alt25th September 2017, 00:02

      advertising

        
       

  4. #4
    Advanced Member level 5
    Points: 12,170, Level: 26

    Join Date
    Nov 2012
    Posts
    2,270
    Helped
    521 / 521
    Points
    12,170
    Level
    26

    Re: Bought a 230V@10A Variac for 90USD, was this cheap or expensive?

    I too have never seen a variac with a built-in autotransformer.

    But I believe that transformers made in Sweden are of very high quality. I have a couple of 230V-120V 100W transformers (toroid wound) that are still good. Of course this is a personal opinion.

    Do you know whether the rating of 10A is valid for 250V (high end or low end or middle end)- if the total output is 2500W, then it is an excellent buy. Even for a Chinese.

    Why two terminals marked "+" and "-"? Very interesting!



    •   Alt25th September 2017, 02:31

      advertising

        
       

  5. #5
    Super Moderator
    Points: 45,875, Level: 52

    Join Date
    Apr 2011
    Location
    Minneapolis, Minnesota, USA
    Posts
    11,446
    Helped
    2250 / 2250
    Points
    45,875
    Level
    52

    Re: Bought a 230V@10A Variac for 90USD, was this cheap or expensive?

    I purchased a used variac through Ebay 15 years ago, about $10. 1.75 A max. No enclosure, no calibrated dial, no power cord. It has 3 terminals so it's an autoformer.

    It was a bargain for the occasional needs I have. At all times I need to be careful about drawing more current than it's rated for.

    Lately I discovered it has an interesting characteristic: variable inductor for use with low frequencies.



  6. #6
    Super Moderator
    Points: 48,654, Level: 53
    Awards:
    Most Frequent Poster

    Join Date
    Apr 2014
    Posts
    9,971
    Helped
    2387 / 2387
    Points
    48,654
    Level
    53

    Re: Bought a 230V@10A Variac for 90USD, was this cheap or expensive?

    Hi,

    Non isolating variacs are often used for fan control ... many years ago.
    Isolating variacs are often used in laboratories.

    An ohmmeter connected to one input and one output should show if it is isolating or not.

    Do you know whether the rating of 10A is valid for 250V (high end or low end or middle end)- if the total output is 2500W, then it is an excellent buy. Even for a Chinese.
    10A should be the rated output current. Independent of voltage setting.
    2500VA is at 250V output voltage only.

    Klaus



  7. #7
    Advanced Member level 5
    Points: 12,170, Level: 26

    Join Date
    Nov 2012
    Posts
    2,270
    Helped
    521 / 521
    Points
    12,170
    Level
    26

    Re: Bought a 230V@10A Variac for 90USD, was this cheap or expensive?

    Quote Originally Posted by c_mitra View Post
    I too have never seen a variac with a built-in autotransformer.
    Sorry. I meant isolation transformer.



    •   Alt25th September 2017, 06:32

      advertising

        
       

  8. #8
    Advanced Member level 5
    Points: 12,538, Level: 26
    schmitt trigger's Avatar
    Join Date
    Apr 2013
    Location
    C4E4DEEEDCE6ECD2
    Posts
    2,118
    Helped
    690 / 690
    Points
    12,538
    Level
    26

    Re: Bought a 230V@10A Variac for 90USD, was this cheap or expensive?

    Variacs of that capacity are expensive.

    And although yours is used, it appears to be in excellent condition,

    I would say it was a good buy.
    My batteries are recharged by "Helpful Post" ratings.
    If you feel that I've helped you, please indicate it as a Helpful Post



  9. #9
    Super Moderator
    Points: 27,385, Level: 40
    ads-ee's Avatar
    Join Date
    Sep 2013
    Location
    USA
    Posts
    6,237
    Helped
    1524 / 1524
    Points
    27,385
    Level
    40

    Re: Bought a 230V@10A Variac for 90USD, was this cheap or expensive?

    Quote Originally Posted by schmitt trigger View Post
    Variacs of that capacity are expensive.
    I would say it was a good buy.
    A quick check seems to confirm this. Based on the prices from a few sites a new 2500va varaic is more than double what you paid for yours and they typically aren't even in a housing like yours.



--[[ ]]--