This part is a kind of semiconductor called BT134-600B.

Function of this product has Triacs.

Manufacturers : Inchange Semiconductor

Image and pinout :

Some of the text within the PDF file :

Triacs BT134-600B INCHANGE ‹ Features ·With TO-126P package ·PIN DESCRIPTION 1 .main terminal 1 2 .main terminal 2 3. gate tab. main terminal 2 ·For use in applications requiring high bidirectional transient and blocking voltage capability and high thermal cycling performance. Typical applications include motor control, industrial and domestic lighting,heating and static switching. ‹ QUICK REFERENCE DATA SYMBOL PARAMETER VDRM Repetitive peak off-state voltage VRRM Repetitive peak off-state voltage IT(AV) Average on-state current ITSM Non-repetitive peak on-state current PGM Peak gate power PG(AV) Average gate power Tstg Storage temperature Tj Operating junction temperature VALUE 600 600 2 20 5 0.5 -45～150 110 UNIT V V A A W W ℃ ℃ TO-126P ‹ ELECTRICAL CHARACTERI [ ... ]

BT134-600B PDF Datasheet Download