Capacitor Contactor CJ19-9512, 50 kVAr, 1NO+2NC, 220V

CJ19 contactors are used in reactive power compensation systems. They serve to switch phase capacitors. Their application is justified because when capacitors are switched on, the resistance is minimal. This causes a surge in current and the contacts are practically in a short-circuit state. However, capacitor contactors prevent this. Their design involves a stepped switching process. First, auxiliary contacts are closed to connect resistors that limit the current in the capacitor circuit. Only after the current drops to a safe level are the main contacts closed.