This part is a kind of semiconductor called 3TH4004-0A.

Function of this product has Control Relays.

Manufacturers : Siemens

Image and pinout :

Some of the text within the PDF file :

Control Relays 3TH4 Fixed 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. Replacement Parts see page 882. 3TH40 Relay Type 2 NO 2 NC Terminals AC Coil Voltage 120V AC 2 2 0 A K6 3TH4040-OAK6 3TH4022-OBB4 Relays With Screw Terminals for DIN Rail and Screw Mounting AC Operation Contact Type No of Contacts Code Early Make Late Break Catalog No (Coil Suffix required from table below) Price $ No of Contacts Code DC Operation Contact Type Early Make Late Break Catalog No (Coil Suffix required from table below) Price $ NO NC NO NC NO NC NO NC Relay With 4 Fixed Contacts Relay With 4 Fixed Contacts 4 40E 4 — — — 3TH4040-0A�� [ ... ]

3TH4004-0A PDF Datasheet Download