This part is a kind of semiconductor called RY12W-K.

Function of this product has MINIATURE RELAY.

Manufacturers : Fujitsu

Image and pinout :

Some of the text within the PDF file :

MINIATURE RELAY 2 POLES1 to 2 A (FOR SIGNAL SWITCHING) RY SERIES s FEATURES q Ultra high sensitivity q UL, CSA recognized q Conforms to FCC rules and regulations Part 68 Surge strength 1,500 V q High dielectric strength type available (RY-WF type) q Contact arrangement MBB type available (RY-D type) q High reliability-bifurcated contacts q Wide operating range q DIL pitch terminals q Plastic sealed type s ORDERING INFORMATION [Example] RY – 12 WF – K (a) ( * ) (b) (c) (d) (a) Series Name RY : RY Series (b) Nominal Voltage Refer to the COIL DATA CHART (c) Coil and Contact Function W : High sensitive type WZ : Nominal 0.5 W type WF : High dielectric strength type WFZ : 2 A type D : 2 FORM D (2 MBB type) (d) Enclosure K : Plastic sealed type Note: Actual marking omits t [ ... ]

RY12W-K PDF Datasheet Download