Bel Fuse Inc. Watch

from SC 13D/A 2 pages Power-One Recently Announced Its Financial Results for the Fiscal Quarter Ended March 31, 2009, and Entered Into an Agreement With Silver Lake Sumeru (“Silver Lake”), Pursuant to Which Silver Lake Will Make a $60 Million Investment in the Company, Consisting of $23.6 Million of Convertible Preferred Stock, $36.4 Million Senior Convertible Notes, and 8.7 Million Warrants for Power-One Common Stock

from SC 13D/A 1 page Underwriting agreement

from SC 13D/A 1 page Joint Filing Agreement

from SC 13D/A 2 pages We Appreciate the Time That Mr. Jay Walters, Chairman of the Board, and Mr. Richard J. Thompson, Chief Executive Officer, Took to Speak With Me on March 25, 2008. Bel Fuse Inc., Together With Our Wholly-Owned Subsidiary, Bel Ventures Inc., Is One of the Largest Stockholders of Power-One, Inc. ("Power-One" or the "Company") Owning [4,370,052] Shares of the Company's Common Stock, or Approximately [5.0]% of the Outstanding Shares. We Have Invested in Power-One Because We Believe That There Is Substantial Unrecognized Value in the Company. Based Upon Our Discussion With Messrs. Walters and Thompson and Our In-Depth Review of Publicly Available Information, However, We Have Strong Doubts About the Company's Ability to Remain Financially Viable. Simply Put, It Is Our Belief That if Power-One Continues to Perform as It Did in the Most Recently Completed Fiscal Quarter, for Example, With Cash and Cash Equivalents Decreasing $7.6 Million Since December 31, 2007, the Company Will Quickly Become Unable to Meet Its Capital Requirements

from SC 13G/A 1 page March 10, 2008 · Power-One and Bel Focus on Product Families That Are the Same or Closely Related, and Our Technologies, Products, and Know-How Strongly Complement Each Other. · There Are Significant Opportunities for the Realization of Synergies Resulting From the Combination of Our Businesses. · Combining Our Operations on a Global Basis Would Result in the Broadest Range of Products in the Industry

from SC 13D 1 page Joint Filing Agreement

from SC 13D/A 1 page Schedule II Information With Respect to Transactions Effected During the Past Sixty Days or Since the Most Recent Filing on Schedule 13d (1) Shares Purchased Average Date Sold(-) Price(2) Common Stock-Bel Fuse Inc. Gamco Asset Management Inc. 1/30/08 5,000 31.5100 1/29/08 5,000 31.8354 1/25/08 5,000 31.0760 1/24/08 4,900 31.5000 1/23/08 100 31.0500 1/08/08 1,900 33.1800 1/07/08 200 33.1800 1/04/08 2,900 33.3055 1/02/08 1,300 34.0000 Tenton Advisors, Inc. 1/29/08 1,300 31.6000 Gabelli Funds, LLC. Gabelli Small Cap Growth Fund 1/30/08 19,200 31.7370 1/29/08 800 31.7300 1/08/08 5,000 32.8800 (1) Unless Otherwise Indicated, All Transactions Were Effected on the NASDAQ Global Market. (2) Price Excludes Commission

from SC 13D/A 3 pages Schedule II Information With Respect to Transactions Effected During the Past Sixty Days or Since the Most Recent Filing on Schedule 13d (1) Shares Purchased Average Date Sold(-) Price(2) Common Stock-Bel Fuse Inc. Gamco Investors, Inc. 12/14/07 5,000 34.4760 11/28/07 500 34.9336 11/27/07 800 33.8164 11/20/07 500 34.0000 11/01/07 3,600 34.4395 10/31/07 900 34.6159 Gabelli Funds, LLC. Gabelli Small Cap Growth Fund 11/01/07 3,700 34.4395 10/31/07 800 34.6159 Gabelli Equity Trust 12/04/07 1,400 33.7785 12/03/07 1,300 33.8500 11/27/07 2,600 33.5576 11/26/07 400 33.7950 11/19/07 2,300 33.8022 11/16/07 4,100 33.7629 11/05/07 700 33.7600 (1) Unless Otherwise Indicated, All Transactions Were Effected on the NASDAQ Stock Market. (2) Price Excludes Commission

from SC 13D/A 3 pages Schedule II Information With Respect to Transactions Effected During the Past Sixty Days or Since the Most Recent Filing on Schedule 13d (1) Shares Purchased Average Date Sold(-) Price(2) Common Stock-Bel Fuse Inc. Gamco Asset Management Inc. 10/30/07 5,500 34.6705 10/25/07 100 34.6800 10/24/07 100 34.6800 10/19/07 10,300 35.0361 10/18/07 1,800 35.0784 10/17/07 1,900 35.0224 Gabelli Funds, LLC. Gabelli Small Cap Growth Fund 10/30/07 5,500 34.6705 10/17/07 1,000 35.3500 10/16/07 1,300 35.3500 (1) Unless Otherwise Indicated, All Transactions Were Effected on the NASDAQ Stock Market. (2) Price Excludes Commission

from SC 13D/A 3 pages Schedule II Information With Respect to Transactions Effected During the Past Sixty Days or Since the Most Recent Filing on Schedule 13d (1) Shares Purchased Average Date Sold(-) Price(2) Common Stock-Bel Fuse Inc. Gamco Asset Management Inc. 10/12/07 9,600 36.6599 10/11/07 1,400 36.6600 10/10/07 100 37.1500 10/09/07 2,500 37.1500 10/08/07 300 37.1500 10/05/07 1,000 37.1500 10/04/07 4,100 37.1500 10/02/07 1,000 38.0490 9/28/07 2,400 36.9800 9/27/07 700 36.9800 9/26/07 2,000 36.9800 9/25/07 4,400 36.9800 9/24/07 10,500 37.1436 9/17/07 5,000 34.9000 9/11/07 22,000- 34.5000 9/11/07 1,200 35.0000 9/07/07 3,800 34.0500 (1) Unless Otherwise Indicated, All Transactions Were Effected on the NASDAQ Stock Market. (2) Price Excludes Commission

from SC 13D/A 3 pages Schedule II Information With Respect to Transactions Effected During the Past Sixty Days or Since the Most Recent Filing on Schedule 13d (1) Shares Purchased Average Date Sold(-) Price(2) Common Stock-Bel Fuse Inc. Gamco Asset Management Inc. 9/04/07 4,000 34.8800 8/31/07 2,000 35.2783 8/27/07 1,000 36.0793 8/27/07 1,300 36.0769 8/24/07 1,000 36.0940 8/24/07 700 36.1000 8/23/07 1,500 35.9287 8/22/07 3,000 35.9294 8/21/07 100 36.0500 8/20/07 1,800 36.2989 8/20/07 900- 36.2989 8/15/07 500 34.5400 Gabelli Advisers, Inc. 8/10/07 300- 38.4400 8/09/07 1,300- 36.6254 8/08/07 2,800 32.9518 Gabelli Funds, LLC. Gabelli Small Cap Growth Fund 8/31/07 2,000 35.2783 8/28/07 2,700 34.6996 8/17/07 200 36.1000 8/14/07 2,800 34.2400 the Gabelli Global Deal Fund 8/08/07 5,000 33.6930 (1) Unless Otherwise Indicated, All Transactions Were Effected on the NASDAQ Stock Market. (2) Price Excludes Commission

from SC 13D/A 3 pages Schedule II Information With Respect to Transactions Effected During the Past Sixty Days or Since the Most Recent Filing on Schedule 13d (1) Shares Purchased Average Date Sold(-) Price(2) Common Stock-Bel Fuse Inc. Gamco Asset Management Inc. 7/24/2007 1,700 36.18 7/20/2007 200 36.20 7/10/2007 4,400 36.22 7/9/2007 3,000 36.54 7/6/2007 1,500 37.08 7/6/2007 7,000 36.76 7/5/2007 5,600 37.00 6/26/2007 500 36.44 Gabelli Funds, LLC. Gabelli Small Cap Growth Fund 7/24/2007 2,900 36.13 7/20/2007 2,100 36.23 6/29/2007 700 37.00 6/27/2007 300 36.10 6/26/2007 1,000 36.25 6/25/2007 2,300 36.14 the Gabelli Global Deal Fund 7/25/2007 600 36.00 7/24/2007 4,300 36.13 7/23/2007 100 36.15 (1) Unless Otherwise Indicated, All Transactions Were Effected on the NASDAQ Stock Market. (2) Price Excludes Commission

from SC 13G/A 1 page Exhibit 1 Joint Filing Agreement in Accordance With Rule 13d-1 (F) Under the Securities Exchange Act of 1934, as Amended, the Undersigned Hereby Agree to the Joint Filing With All Other Reporting Entities (As Such Term Is Defined in the Schedule 13g) on Behalf of Each of Them of a Statement on Schedule 13g (Including Amendments Thereto) With Respect to the Class B Common Stock, $.10 Par Value Per Share, of Bel Fuse Inc., and That This Agreement Be Included as an Exhibit to Such Joint Filing. This Agreement May Be Executed in Any Number of Counterparts All of Which Taken Together Shall Constitute One and the Same Instrument. in Witness Whereof, the Undersigned Hereby Execute This Agreement This 10th Day of July, 2002. Eqsf Advisers, Inc. By:/S/ Martin J. Whitman Martin J. Whitman Chairman and Chief Executive Officer M.J. Whitman Advisers, Inc. By:/S/ Martin J. Whitman Martin J. Whitman Chairman and Chief Investment Officer /S/ Martin J. Whitman Martin J. Whitman

from SC 13G/A 1 page Exhibit 1 Joint Filing Agreement in Accordance With Rule 13d-1 (F) Under the Securities Exchange Act of 1934, as Amended, the Undersigned Hereby Agree to the Joint Filing With All Other Reporting Entities (As Such Term Is Defined in the Schedule 13g) on Behalf of Each of Them of a Statement on Schedule 13g (Including Amendments Thereto) With Respect to the Class B Common Stock, $.10 Par Value Per Share, of Bel Fuse Inc., and That This Agreement Be Included as an Exhibit to Such Joint Filing. This Agreement May Be Executed in Any Number of Counterparts All of Which Taken Together Shall Constitute One and the Same Instrument. in Witness Whereof, the Undersigned Hereby Execute This Agreement This 14th Day of January, 2002. Eqsf Advisers, Inc. By:/S/ Martin J. Whitman Martin J. Whitman Chairman and Chief Executive Officer M.J. Whitman Advisers, Inc. By:/S/ Martin J. Whitman Martin J. Whitman Chairman and Chief Investment Officer /S/ Martin J. Whitman Martin J. Whitman

from SC 13G/A 1 page Exhibit 1 Joint Filing Agreement in Accordance With Rule 13d-1 (F) Under the Securities Exchange Act of 1934, as Amended, the Undersigned Hereby Agree to the Joint Filing With All Other Reporting Entities (As Such Term Is Defined in the Schedule 13g) on Behalf of Each of Them of a Statement on Schedule 13g (Including Amendments Thereto) With Respect to the Class Bcommon Stock, $.10 Par Value Per Share, of Bel Fuse Inc., and That This Agreement Be Included as an Exhibit to Such Joint Filing. This Agreement May Be Executed in Any Number of Counterparts All of Which Taken Together Shall Constitute One and the Same Instrument. in Witness Whereof, the Undersigned Hereby Execute This Agreement This 9th Day of October, 2001. Eqsf Advisers, Inc. By:/S/ Martin J. Whitman Martin J. Whitman Chairman, President and Chief Executive Officer M.J. Whitman Advisers, Inc. By:/S/ Martin J. Whitman Martin J. Whitman Chairman and Chief Executive Officer /S/ Martin J. Whitman Martin J. Whitman

from SC 13G/A 1 page Exhibit 1 Joint Filing Agreement in Accordance With Rule 13d-1 (F) Under the Securities Exchange Act of 1934, as Amended, the Undersigned Hereby Agree to the Joint Filing With All Other Reporting Entities (As Such Term Is Defined in the Schedule 13g) on Behalf of Each of Them of a Statement on Schedule 13g (Including Amendments Thereto) With Respect to the Class B Stock, $.10 Par Value Per Share, of Bel Fuse, and That This Agreement Be Included as an Exhibit to Such Joint Filing. This Agreement May Be Executed in Any Number of Counterparts All of Which Taken Together Shall Constitute One and the Same Instrument. in Witness Whereof, the Undersigned Hereby Execute This Agreement This 10th Day of May, 2001. Eqsf Advisers, Inc. By:/S/ Martin J. Whitman Martin J. Whitman Chairman, President and Chief Executive Officer M.J. Whitman Advisers, Inc. By:/S/ Martin J. Whitman Martin J. Whitman Chairman and Chief Executive Officer /S/ Martin J. Whitman Martin J. Whitman

from SC 13G 1 page Exhibit 1 Joint Filing Agreement in Accordance With Rule 13d-1 (F) Under the Securities Exchange Act of 1934, as Amended, the Undersigned Hereby Agree to the Joint Filing With All Other Reporting Entities (As Such Term Is Defined in the Schedule 13g) on Behalf of Each of Them of a Statement on Schedule 13g (Including Amendments Thereto) With Respect to the Class B Stock, $.10 Par Value Per Share, of Bel Fuse, and That This Agreement Be Included as an Exhibit to Such Joint Filing. This Agreement May Be Executed in Any Number of Counterparts All of Which Taken Together Shall Constitute One and the Same Instrument. in Witness Whereof, the Undersigned Hereby Execute This Agreement This 10th Day of May, 2001. Eqsf Advisers, Inc. By:/S/ Martin J. Whitman Martin J. Whitman Chairman, President and Chief Executive Officer M.J. Whitman Advisers, Inc. By:/S/ Martin J. Whitman Martin J. Whitman Chairman and Chief Executive Officer /S/ Martin J. Whitman Martin J. Whitman