This part is a kind of semiconductor called 50N30.

Function of this product has N-Channel Power MOSFET.

Manufacturers : nELL

Image and pinout :

Some of the text within the PDF file :

SEMICONDUCTOR 50N30 Series N-Channel Power MOSFET 50A, 300Volts RoHS RoHS Nell High Power Products DESCRIPTION The Nell 50N30 is a three-terminal silicon device with current conduction capability of 50A, fast switching speed, low on-state resistance, breakdown voltage rating of 300V, and max. threshold voltage of 6.5 volts. They are designed for use in applications such as switched mode power supplies, DC to DC converters, PWM motor controls, bridge circuits, battery chargers, DC choppers, temperature and lighting controls and general purpose switching applications. G D S TO-247AB (50N30C) D (Drain) FEATURES RDS(ON) = 0.080Ω @ VGS = 10V Ultra low gate charge(65nC typical) Low reverse transfer capacitance (C RSS = 60pF typical) Fast switching capability 100% avalanche energy spe [ ... ]

50N30 PDF Datasheet Download