Low voltage composite switch is a product used for switching capacitors in low-voltage reactive power compensation devices. Its basic working principle is to combine thyristors withMagnetic holding relayParallel connection, controlled by an internal microcontroller, with a thyristor responsible for zero crossing switching at the moment of input and output, and then operated by a magnetic holding relay. againThe closing switch has the advantages of zero crossing switching without inrush current, as well as the low power consumption of AC contactors during operation