This part is a kind of semiconductor called 1.5KE440A.

Function of this product has 1500 Watt Transient Voltage Suppressors 6.8 to 400 Volts.

Manufacturers : Micro Commercial Components

Image and pinout :

Some of the text within the PDF file :

MCC Features

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Maximum Ratings 8
8 [ ... ]

1.5KE440A PDF Datasheet Download