It is a high-power amplifier pair of To-3P package NPN(NJW0281G) and PNP(NJW0302G), their parameters are respectively :Vceo, Vcbo, Vcex 250v,Vebo 5v,Ic 15A,Ib 1.5A,Pd 150w. 2sc5200 is NPN230 volts 15 amps 150 watts, 2sa1943 is PNP-230 volts 15 amps 150 watts can be substituted.