JERSEY CITY, N.J. -- April 29, 2009 -- Bel Fuse Inc. (NASDAQ:BELFA) (NASDAQ:BELFB) announced today that it has sent a letter to the Board of Directors of Power-One, Inc. (NASDAQ:PWER) questioning the advisability of acquiring more debt pursuant to its recently announced agreement with Silver Lake Sumeru, which potentially dilutes current shareholders by more than 75%. Bel Fuse also expressed its alarm over Power-One's continued refusal to consider strategic alternatives, including the divestiture of one or more of its business units, even though Power-One's stock continues to perform abysmally.

"The Silver Lake transaction illustrates Power-One's insistence on sticking with what we believe has proven and continues to be a losing strategy: the incurrence of expensive debt and the refusal by the Company to divest of one or more of its business units in order to reduce debt. Moreover, the Silver Lake transaction will result in substantial dilution to the Company and will, in our view, adversely impact the Company's stock price, to the detriment of all of its stockholders," said Daniel Bernstein, Bel's CEO and President.

About Bel

Bel (www.belfuse.com) and its subsidiaries are primarily engaged in the design, manufacture and sale of products used in networking, telecommunications, high speed data transmission and consumer electronics. Products include magnetics (discrete components, power transformers and MagJack®s), modules (DC-DC converters, integrated analog front end modules and custom designs), circuit protection (miniature, micro and surface mount fuses) and interconnect devices (passive jacks, plugs and cable assemblies). Bel operates facilities around the world.

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#4653

Bel Fuse Inc.

206 Van Vorst Street

Jersey City, NJ 07302

www.belfuse.com

tel 201.432.0463

fax 201.432.9542

Investor Contact:

Neil Berkman Associates

(310) 277-5162

info@berkmanassociates.com

Company Contact:

Daniel Bernstein

President

ir@BelFuse.com