This part is a kind of semiconductor called AM100.

Function of this product has 1.0 AMPERE SILICON MINIATURE SINGLE- PHASE BRIDGES(VOLTAGE - 50 to 1000 Volts CURRENT - 1.0 Amperes).

Manufacturers : Pan Jit International Inc.

Image and pinout :

Some of the text within the PDF file :

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AM100 PDF Datasheet Download