Reactive power compensator

The compensator (1) has an assembly (24) of capacitors (C1-C3), and two electromechanical contacts (CT1, CT2) connected to the assembly. Each contactor comprises an upstream power terminal (18) and a downstream power terminal (20). Electric current is circulated between upstream and downstream power terminals in closed position of the contactors. A control algorithm allows closure of a respective electromechanical contactor for zero voltages (U AC, U BD) between the terminals, and allows opening of the contactor for minimum power value of the capacitors to which the contactor is connected.