SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934

                                AULT INCORPORATED
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                      Common Stock, no par value per share
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

- --------------------------------------------------------------------------------
                                    051503100
- --------------------------------------------------------------------------------
                                 (CUSIP Number)
                                                      with a copy to:
Colin W. Dunn, Vice President and Treasurer           Peter H. Ehrenberg, Esq.
Bel Fuse Inc.                                         Lowenstein Sandler PC
198 Van Vorst Street                                  65 Livingston Avenue
Jersey City, New Jersey 07302                         Roseland, New Jersey 07068
(201) 432-0463                                        (973) 597-2350

- --------------------------------------------------------------------------------
                 (Name, Address and Telephone Number of Persons
                Authorized to Receive Notices and Communications)

                                September 2, 1999
- --------------------------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)


If the filing person has previously  filed a statement on Schedule l3G to report
the  acquisition  which is the subject of this  Schedule 13D, and is filing this
schedule  because of  Sections 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check
the following box. [ ]

Note:  Schedules  filed in paper format shall include a signed original and five
copies  of  the  schedule, including all exhibits. See Section 240.13d-7(b)  for
other parties to whom copies are to be sent.

*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for  any  subsequent   amendment   containing   information  which  would  alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).






1) Names of Reporting Persons/I.R.S. Identification Nos. of Above Persons
   (entities only):

                            Bel Fuse Inc. 22-1463699
________________________________________________________________________________

2)  Check the Appropriate Box if a Member of a Group (See Instructions):

     (a) [  ]                                            (b) [  ]
________________________________________________________________________________

3)  SEC Use Only
________________________________________________________________________________

4)  Source of Funds (See Instructions):  WC
________________________________________________________________________________

5)  Check  if Disclosure of Legal Proceedings is Required Pursuant to Items 2(d)
    or 2(e): [   ]
________________________________________________________________________________

6)   Citizenship or Place of Organization:           New Jersey
________________________________________________________________________________
     Number of                               7) Sole Voting Power:       249,900
                                             -----------------------------------
     Shares Beneficially                     8) Shared Voting Power:           0
                                             -----------------------------------
     Owned by
     Each Reporting                          9) Sole Dispositive Power:  249,900
                                             -----------------------------------
     Person With:                           10) Shared Dispositive Power:      0
                                            ------------------------------------
________________________________________________________________________________
11)  Aggregate Amount Beneficially Owned by Each Reporting Person:       249,900
________________________________________________________________________________
12)  Check if the Aggregate Amount in Row (11) Excludes Certain Shares:  [  ]
________________________________________________________________________________
13)  Percent of Class Represented by Amount in Row (11):            5.7%
________________________________________________________________________________
14)  Type of Reporting Person (See Instructions):       CO
________________________________________________________________________________






Item 1.   Security and Issuer.

          This  statement on Schedule 13D (the  "Schedule  13D")  relates to the
shares of Common Stock, no par value (the "Common Stock"),  of Ault Incorporated
(the "Company") whose principal  executive offices are located at 7105 Northland
Terrace, Minneapolis, Minnesota 55428-1028.

Item 2.   Identity and Background.

          Bel Fuse Inc. ("Bel Fuse") is a corporation  organized  under the laws
of the State of New Jersey.  Bel Fuse is engaged in the design,  manufacture and
sale of products used in networking, telecommunication,  automotive and consumer
electronic  applications.  Bel Fuse maintains its principal executive offices at
198 Van Vorst Street,  Jersey City, New Jersey 07302. Attached is an appendix to
Item 2 setting forth the name, present principal  occupation or employment,  the
current business address and citizenship of each director and executive  officer
of Bel Fuse.

          Neither  Bel  Fuse  nor,  to the  best  of its  knowledge,  any of its
directors  or  executive  officers  has  ever  been  convicted  in any  criminal
proceeding,  nor has been a party to any  civil  proceeding  commenced  before a
judicial or administrative  body of competent  jurisdiction as a result of which
such entity or person was or is now subject to a judgment, decree or final order
enjoining future violations of, or prohibiting or mandating  activities  subject
to,  federal or state  securities  laws or finding any violation with respect to
such laws.

Item 3.   Source and Amount of Funds or Other Consideration.

          In a series of transactions  from August 17, 1999 through September 2,
1999, Bel Fuse,  through its  wholly-owned  subsidiary,  Bel Ventures Inc. ("Bel
Ventures"),  acquired  an  aggregate  of 249,900  shares of Common  Stock of the
Company  through   open-market   purchases.   Bel  Fuse  paid  an  aggregate  of
approximately $1,353,396 (which amount includes the cost of commissions) for the
shares  of  Common  Stock  of the  Company  out of the  working  capital  of Bel
Ventures. The respective dates of acquisition of the shares of Common Stock, the
amount of shares of Common  Stock  purchased in each such  acquisition,  and the
purchase  price per share with  respect to each such  acquisition  are set forth
below:

Date of Acquisition           Number of Shares Purchased         Price Per Share

August 17, 1999                      101,000                           $5.125

August 18, 1999                       40,500                           $5.50

August 19, 1999                        9,500                           $5.50

August 20, 1999                       11,500                           $5.50

August 31, 1999                       54,500                           $5.625

September 2, 1999                     32,900                           $5.50


Item 4.   Purpose of Transaction.

          Bel Fuse acquired the Common Stock for investment purposes, and except
as described  below, Bel Fuse has no present plans or intentions which relate to
or would result in any of the transactions required to be described in Item 4 of
Schedule 13D.

          Bel Fuse  intends to closely  evaluate the  performance  of the Common
Stock,  including,  but not limited to, the continued analysis and assessment of
the  Company's  business,  assets,  operations,   financial  condition,  capital
structure,  management  and prospects.  Depending  upon the Company's  financial
condition,  results of operations,  future prospects and other factors which Bel
Fuse deems relevant, Bel Fuse may, and hereby reserves the right to, (i) acquire
additional  shares of Common  Stock of the  Company  or sell the shares Bel Fuse
owns, (ii) communicate with other shareholders of the Company or persons who may
desire to become  shareholders  of the Company  regarding the replacement of the
Company's executive officers,  members of the Board of Directors of the Company,
and/or other  matters  regarding  the  management  and operation of the Company,
(iii)  seek  the  removal  of one or more  members  of the  Company's  Board  of
Directors  and/or  executive  officers,  (iv)  seek to  amend  the  Articles  of
Incorporation  or By-laws of the  Company to  increase  the size of the Board of
Directors,  elect  one or  more  designees  to  fill  any  resulting  vacancies,
facilitate the removal of one or more directors and/or executive officers of the
Company, and/or for any other purpose, (v) solicit proxies, to be used at either
the Company's  regular  annual meeting or at a special  meeting,  or consents in
lieu of any such meeting,  for the purposes described in (iii) and/or (iv) above
or for the  election  of one or more  nominees  of Bel Fuse  and/or  such  other
shareholders  to the Board of Directors  of the Company,  (vi) seek to cause the
Company to merge with or into,  consolidate with,  transfer all or substantially
all of its assets to, or otherwise engage in any business  combination with, one
or more other parties  (whether or not affiliated  with or otherwise  related to
Bel Fuse), or (vii) take such other action as Bel Fuse may determine.

Item 5.   Interest in Securities of the Issuer.

          Based upon  information  set forth in the  Company's  Annual Report on
Form 10-K for the fiscal year ended May 30, 1999, there were 4,383,787 shares of
Common Stock  issued and  outstanding  as of August 4, 1999.  As of September 2,
1999,  Bel Fuse  beneficially  owned an  aggregate  of 249,900  shares of Common
Stock, or 5.7% of the issued and outstanding shares of Common Stock.

          Bel Fuse has the sole power to vote or to direct the vote and the sole
power to dispose or to direct the  disposition  of all 249,900  shares of Common
Stock beneficially owned by it.

          Except as described in Item 3 of this  Schedule  13D,  during the past
sixty  days,  there  were no  transactions  in the  shares of Common  Stock,  or
securities  convertible  into or exchangeable for shares of Common Stock, by Bel
Fuse or any person or entity  controlled by Bel Fuse or any person or entity for
which Bel Fuse possesses voting control over the securities thereof.

          No other  person is known by Bel Fuse to have the right to  receive or
the power to direct the receipt of dividends from, or the proceeds from the sale
of, the Common Stock beneficially owned by Bel Fuse.

Item 6.   Contracts, Arrangements, Understandings or Relationships With  Respect
          to Securities of  the Issuer.

          No contracts,  arrangements,  understandings or similar  relationships
exist with  respect to the  securities  of the Company  between Bel Fuse and any
person or entity.


Item 7.   Material to be Filed as Exhibits.

          None






                                    Signature

                  After  reasonable  inquiry and to the best of my knowledge and
belief,  I certify  that the  information  set forth in this  statement is true,
complete and correct.

                                         September 11, 1999

                                         BEL FUSE INC.




                                         Name:    /s/Colin W. Dunn
                                                  ______________________________
                                                  Colin W. Dunn
                                         Title:   Vice President and Treasurer


Attention:  Intentional  misstatements  or omissions of fact constitute  Federal
            criminal  violations (See 18 U.S.C. 1001).







                               APPENDIX TO ITEM 2
Name and Residence or Business Principal Employment and Address* Position with Bel Fuse Inc. Principal Business of Employer Elliot Bernstein** Executive Officer and Director Chairman of the Board and Chief Executive Officer of Bel Fuse Inc. Daniel Bernstein** Executive Officer and Director President of Bel Fuse Inc. Howard B. Bernstein*** Director Retired Colin W. Dunn** Executive Officer Vice President and Treasurer of Bel Fuse Inc. Arnold Sutta** Executive Officer Vice President of Sales of Bel Fuse Inc. Peter Christoffer** Executive Officer Vice President of Research and Development of Bel Fuse Inc. Joseph Meccariello** Executive Officer Vice President of Manufacturing of Bel Fuse Inc. John F. Tweedy**** Director Director of Public Relations of Globespan Semiconductor Inc. Robert H. Simandl***** Executive Officer and Director Secretary of Bel Fuse Inc. Peter Gilbert****** Director President and Chief Executive Officer of The Gilbert Manufacturing Company John S. Johnson******* Director Independent Consultant for various companies, including Bel Fuse Inc.
* All of the directors and executive officers of Bel Fuse Inc. are citizens of the United States, except for Colin W. Dunn who is an Australian citizen. ** Business address is Bel Fuse Inc., 198 Van Vorst Street, Jersey City, New Jersey 07032. *** Residence is 21 Big Beech Lane, Colts Neck, New Jersey 07722. **** Business address is Globespan Semiconductor Inc., 100 Schulz Drive, Red Bank, New Jersey 07701. ***** Business address is 24 North 3rd Avenue, Highland Park, New Jersey 08904. ****** Business address is Gilbert Manufacturing Co., 1107 Broadway, Suite 1310, New York, New York 10010. ******* Residence is P.O. Box 1164, Queeche, Vermont 05059.