FIELD: electrical engineering. SUBSTANCE: protective gear has magnetic starter with thermal relay inserted in its control circuit, START and STOP buttons, auxiliary contacts, and coil; novelty is that two rectified line voltages are applied to its control circuit and that coil is shorted out by diode; stator winding neutral is grounded through high-value resistor, capacitor, and neon lamp. EFFECT: reduced trouble probability for electric motors. 3 dwg
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