Greetings Ricardo, you just have to write the data and write datasheet..asi you will have access to the semiconductor technical data.In this case it is a diode bridge.monophasic 280vca.25 ampers, 4 pins ,, you can use google or yahho. The leg that comes in a different position is the positive DC output, opposite the corner is the negative of the DC output, remember that it will become CD when you install a capacitor of adequate capacity In the diode bridge body, the connections or inputs of the voltage outputs are printed, remember that the current capacity will also depend on the transformer luck