The present invention relates to a contactor, a connector and a contactor component. According to the first aspect of the invention, a contactor relates to a switch mechanism, an iron core, an iron core position sensing circuit and a control circuit. The control circuit can measure the position of the iron core by measuring the variation in inductance by using the property that the coil can produce different inductances when the iron core is in different positions in the coil. According to the second aspect of the invention, a connector and contactor component are provided, wherein a control circuit is arranged on a connector, the control circuit comprises a PWM power-saving circuit. The PWM power-saving circuit is integrated on the connector, so that the average driving current of the contactor is reduced and meanwhile, the size of the contactor is reduced.