The connector system ECO-TRONIC offers a wide range of solutions for connecting to standard RAST 2.5 - 2.5 mm spacing - with IDC technology, commonly known in Italy with the terms "insulation displacement" or " insulation displacement "for section conductors between 0.22 and 0.35 sq mm and maximum diameter of the insulating equal to 1.6 mm. Here we present the free connector. The series ECO-TRONIC is suitable to be connected directly on the printed circuit board or by means of a pan: we speak in this case, more or less improperly, the Execution Execution direct or indirect. Some families are suitable to be linked exclusively on the printed circuit, such as the series 7238 and 7242, other, more flexible, but with minor retention forces on the printed circuit, are suitable for both types of connection, direct and indirect. The series MS 7320 is suitable for the construction of joints or steering wheels for connections from panel. The series 7237 is suited for solutions in the bus, otherwise known on the market with the name Daisy Chain. For System Technology or hooking mean a system active or passive restraint of the connector on the printed circuit board (but also on the pan) allowing to increase the extraction force of the connector from the printed circuit or by the same vessel.