This part is a kind of semiconductor called KBPC5004.

Function of this product has (KBPC5000 - KBPC5010) SILICON BRIDGE RECTIFIERS.

Manufacturers : EIC

Image and pinout :

Some of the text within the PDF file :

KBPC5000 - KBPC5010 PRV : 50 - 1000 Volts Io : 50 Amperes FEATURES : * * * * * * * High case dielectric strength High surge current capability High reliability High efficiency Low reverse current Low forward voltage drop Pb / RoHS Free SILICON BRIDGE RECTIFIERS BR50-M 0.728(18.50) 0.688(17.40) 0.570(14.50) 0.530(13.40) 0.685(16.7 1.130(28.70) 1.120(28.40) 0) 0.658(16.70) 0 618(15 70) 0.032(0.81) 0.028(0.71) 0.210(5.30 ) 0.252(6.40 ) φ0.100(2.50 ) 0.905(23.0) 0.826(21.0) MECHANICAL DATA : * * * * * Case : Metal Case Epoxy : UL94V-O rate flame retardant Terminals : plated .25" (6.35 mm). Faston Polarity : Polarity symbols marked on case Mounting position : Bolt down on heat-sink with silicone thermal compound between bridge and mounting surface for maximum heat tr [ ... ]

KBPC5004 PDF Datasheet Download