Abstract: A multiplex connector, which includes a first circuit for providing a reference voltage to a photoelectric comparator by means of a photoelectric operation so as to further control a charge/recharge-timer circuit; a second circuit comprising a pyroelectric infrared detector which is triggered by means of a change in ambient temperature for providing a signal through an amplifier circuit and a window-limited comparator to the charge/recharge-timer circuit for closing or opening a driving circuit to further control the load. Through full-wave rectification and current amplification, an electronic switching circuit is also provided to control the power supply to the load which is connected thereto in series.