This part is a kind of semiconductor called S6015L.

Function of this product has SCRS.

Manufacturers : Littelfuse

Image and pinout :

Some of the text within the PDF file :

Part: S6015L Series: Teccor® SCR Devices Technology: SCRs PARAMETERS Package Type Mount Method Critical Rate-of-rise of On-state Current Critical rate-of-rise of applied forward voltage Peak off-state forward and reverse current Peak off-state forward and reverse current Peak off-state forward and reverse current Peak Gate Current Average on-state current RMS Surge (Non-repetitive) On-state Fusing Current Average Gate Power Dissipation Peak Gate Power Dissipation Package Size/Form Factor Gate-controlled Turn-on time Circuit commutated turn-off time Peak Reverse Gate Voltage Gate Trigger Voltage Gate Trigger Voltage Peak on-state Gate Trigger Voltage Gate Trigger Voltage Maximum on-state current Pkg Type Mount di/dt (A/µs) dv/dt @ 100°C V/µs Radial Leaded Through hole 125 425 I D [ ... ]

S6015L PDF Datasheet Download