EXHIBIT 99.1 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the annual report of Bel Fuse Inc. (the "Company") on Form 10-K for the year ended December 31, 2002 filed with the Securities and Exchange Commission (the "Report"), I, Daniel Bernstein, President and Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that: (1) The Report fully complies with the requirements of Section 13(a) of the Securities Exchange Act of 1934;and (2) The information contained in the Report fairly presents, in all material respects, the consolidated financial condition of the Company as of the dates presented and consolidated result of operations of the Company for the periods presented. (3) A signed original of this written statement required by Section 906 has been provided to Bel Fuse Inc. and will be retained by Bel Fuse Inc. and furnished to the Securities and Exchange Commission or its staff upon request. Dated: March 21, 2003 By: /s/ Daniel Bernstein ----------------------------- Daniel Bernstein, President and Chief Executive Officer This certification has been furnished solely pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.