DEVICE FOR DISCONNECTING AC SUPPLY VOLTAGE FROM LOAD IN CASE IT RISES ABOVE PERMISSIBLE VALUE Russian patent published in 2001 - IPC

FIELD: overvoltage protective gear for loads such as electronic devices. SUBSTANCE: device functions to continuously monitor ac supply voltage level and to disconnect load from supply mains within maximum one half-cycle of ac supply voltage in case it rises above permissible value. Using transistor switch in device enables voltage disconnection from load within a few microseconds. As soon as supply voltage decreases to rated value, device automatically turns on the load. Device provides for isolation of power and control circuits. Voltage regulator diode is used as threshold element,. EFFECT: enlarged functional capabilities. 4 cl, 2 dwg