This part is a kind of semiconductor called 3TK28xx.

Function of this product has (3TK28xx / 3TK29xx) Contactor Safety Combination.

Manufacturers : Siemens

Image and pinout :

Some of the text within the PDF file :

Contactor Safety Combination Instructions WARNING: HAZARDOUS VOLTAGE CAN CAUSE ELECTRICAL SHOCK AND BURNS. DISCONNECT POWER BEFORE PROCEEDING WITH ANY WORK ON THIS EQUIPMENT. Operation permissible in switchgear cabinet with degree of protection IP 54 only! 3TK2803, 3TK2804 3TK2907, 3TK29.3 DIN EN 60439 Part 1/ VDE 0660 Part 500 (04.94) Order No.: 3ZX1012-0TK20-1AA2 English Technische Daten Permissible ambient temperature TU: - Operation -25 to +55 °C - Storage -55 to +80 °C for 3TK 29.3 -25 to +80 °C Degree of protection IP 20 Insulation coordination to DIN VDE 0110 Part 1 and Part 2 (01.89): Clearances in air and creepage paths: 4 kV/3 (Control circuit: 1.5 kV/3) Rated insulations voltage (for control circuit Rated impulse withstand voltage (for control circuit U [ ... ]

3TK28xx PDF Datasheet Download