This part is a kind of semiconductor called 3TK2907.

Function of this product has Contactor Safety Combination.

Manufacturers : Siemens

Image and pinout :

Some of the text within the PDF file :

Contactor Safety Combination Instructions 3TK2803, 3TK2804 3TK2907, 3TK29.3 DIN EN 60439 Part 1/ VDE 0660 Part 500 (04.94) Order No.: 3ZX1012-0TK20-1AA2 English WARNING: HAZARDOUS VOLTAGE CAN CAUSE ELECTRICAL SHOCK AND BURNS. www.cDoImSCONNECT POWER BEFORE PROCEEDING WITH ANY WORK ON THIS EQUIPMENT. Operation permissible in switchgear cabinet with degree of protection IP 54 only! Application The contactor safety combinations can be used in EMERGENCY-OFF circuits and for monitoring protective devices (e.g. protective screens). Functions and connections The internal control circuit of the contactor safety combination is designed according to DIN EN 60204, Part 1 (VDE 0113, Part 1), para. 9.4.2.2, so that in the case of a fault in one of the contactor relays the function of t [ ... ]

3TK2907 PDF Datasheet Download