Multiway switch series fault detection circuitry

The utility model discloses a multiway switch series fault detection circuitry, its characterized in that: detection circuitry include that the switching element that high voltage power supply inserted a plurality of series connection inserts the load, voltage sample treatment circuit carries on sending entry control the unit with the judged result after the comparison is carried out with the benchmark value to the voltage sample to one of them cluster switch device. Since the above structure is adopted, the utility model discloses a protection is realized to the voltage of a set of switching element of taking a sample alone, has solved that the multiunit is taken a sample simultaneously, the loaded down with trivial details scheduling problem of multichannel high voltage isolation, trouble centralized processing, has simplified sample protect function, has also improved fault detection's accuracy and reliability greatly, optimizes the circuit performance of series switch subassembly.