PROTECTIVE DISCONNECTING DEVICE FOR GROUNDED- NEUTRAL MAINS (ALTERNATIVES) Russian patent published in 2001 - IPC

FIELD: electrical engineering; selective electric-shock, overcurrent, and ground-fault protective gear. SUBSTANCE: novelty in device designed for protecting personnel against electric shock in case of their contact with current carrying parts or non-current-carrying ones energized due to insulation fault, and also for overcurrent protection of electrical equipment due to shingle-phase shorts through grounded-neutral members of metal structures is reduced number of active components in amplifier circuit with frequency response shaping function transferred to passive components (resistors, capacitors) and that negative bias across gate electrode of thyristor is used. EFFECT: reduced power requirement, enhanced reliability and service life. 3 cl, 3 dwg