FIELD: electrical engineering; asymmetric-running protection of three-phase loads.
SUBSTANCE: proposed protective gear has electromagnetic starter one of whose coil leads is connected to neutral conductor of supply mains and other one, to supply mains phase lead through STOP button and triac; gate electrode of triac is connected through current-limiting resistor and diode to center tap of capacitor and resistor series-connected to inductance coil and connected to other phase leads of supply mains. START button is connected in parallel with triac cathode and anode.
EFFECT: enhanced electric safety in handling of protective gear; simplified design.
1 cl, 1 dwg
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