This part is a kind of semiconductor called GV2P16.

Function of this product has Manual Starter and Protector.

Manufacturers : Steven Engineering

Image and pinout :

Some of the text within the PDF file :

Starters www.schneider-electric.us TeSys® GV2 and GV3 Manual Starter and Protector Refer to Catalog 2520CT0001 The GV family of products are 3-pole, horsepower rated, UL 508 listed, manual starters. They include a manual disconnect, class 10 ambient-compensated thermal overload relay, and an instantaneous magnetic trip mechanism in one compact unit. Any GV manual starter can be used alone for local manual control of a motor with individual full-load currents up to 220 amps. The GV family of products may also be used in group motor installations in accordance with National Electric Code article 430-53. Group motor installations give you greater panel density for smaller size and require fewer parts and less wiring necessary for installation when compared to convention [ ... ]

GV2P16 PDF Datasheet Download