FIELD: electrical engineering.
SUBSTANCE: invention relates to electric switch mechanisms. Three-wire device for controlling electric switch mechanism comprises connected to source of alternating three-phase voltage (1) switching and control unit (2), three-wire line (8), phase-sensitive unit (9), electric motor (16) and automatic circuit breaker (17). Phase-sensitive unit (9) comprises resistors (14) and (15), capacitors (12) and (13), relays (10) and (11) and their contacts (10.1), (10.2), (11.1), (11.2). Outputs of phase-sensitive unit (9) are connected to electric motor (16) and auto-switch (17) of electric switch mechanism.
EFFECT: technical result is improved reliability of electric switch mechanism.
1 cl, 1 dwg
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