This part is a kind of semiconductor called 3TH3031-0A.

Function of this product has Control Relays.

Manufacturers : Siemens

Image and pinout :

Some of the text within the PDF file :

Control Relays 3TH3 Snap-On Contacts Type Ordering Information ᮣ Selection ᮣ Determine the number of contacts, AC or DC, then select Catalog Number. Complete Catalog Number by adding Coil suffix from table below e.g.: 3TH30 2 2 0 A K6 ᮣ ᮣ ᮣ Accessories, Varistors, RC Elements and Suppressors listed in table below. Select Auxiliary Contacts if required from table below. Replacement Parts see page 882. 3TH3040-0AK6 3TX4010-2A Relay Type 2 NO 2 NC Screw Terminal AC Coil Voltage 120V AC Relays with Screw Terminal for DIN Rail and Screw Mounting Contact Type Number of Contacts Catalog Number (Coil Suffix required from table below) Auxiliary Contacts (Top Mount) Contact Type Price $ Number of Contacts Early Make Late Break Catalog No Code NO NC 3TH3 Relays for AC Operat [ ... ]

3TH3031-0A PDF Datasheet Download