This part is a kind of semiconductor called S4VB20.

Function of this product has Bridge Diode(200V 4A).

Manufacturers : Shindengen Electric Mfg.Co.Ltd

Image and pinout :

Some of the text within the PDF file :

SHINDENGEN Bridge Diode Square In-line Package S4VB20 200V 4A OUTLINE DIMENSIONS Case : S4VB Unit : mm RATINGS ●　Absolute Maximum Ratings Item Symbol Conditions Tstg Storage Temperature Tj Operating Junction Temperature Maximum Reverse Voltage VRM IO 50Hz sine wave, R-load, Ta=40℃ With heatsink θfa=10℃/W Average Rectified Forward Current 50Hz sine wave, R-load, Ta=40℃ Peak Surge Forward Current Current Squared Time Mounting Torque Without heatsink IFSM 50Hz sine wave, Non-repetitive 1cycle peak value, Tj=25℃ I2t 1ms≦t＜10ms　Ｔc=25℃ TOR （Recommended torque : 0.5N･m） Ratings Unit -40～150 ℃ 150 ℃ 200 V 4 A 2.6 80 A 32 A2ｓ 0.8 N･m Ratings Unit Max.1.05 V Max.10 μA Max.4.5 ℃/W ●　Electrical Characteristics (Tl=25℃) Item Symbol Conditions VF IF= [ ... ]

S4VB20 PDF Datasheet Download