This part is a kind of semiconductor called A50P80-4.

Function of this product has SEMICONDUCTOR PROTECTION FUSES.

Manufacturers : Ferraz

Image and pinout :

Some of the text within the PDF file :

AMP-TRAP®–Form 101 A50P SEMICONDUCTOR PROTECTION FUSES A50P Amp-trap® Form 101 Semiconductor Protection fuses were developed for DC drives, uninterruptable power supplies and similar applications requiring better protection (lower l2t) and superior reliability. The A50P is typically used for replacement. Features / Benefits ® Low l2t minimizes damage to protected components on short circuit ® Controlled arc voltage reduces stress to circuit components during fuse clearing ® Choice of mounting types helps in equipment design Ratings ® AC: 10-1200A 500VAC, 100kA I.R. ® DC: 35-1000A 450VDC, 79kA I.R. L/R = 10ms Approvals ® UL Recognized Component ® AC: UL Guide No. JFHR2 (10-800A) ® DC: UL Guide No. JFHR2 (35-800A) HIGHLIGHTS: Very Fast Acting ® Current L [ ... ]

A50P80-4 PDF Datasheet Download