| 摘要 |
The device is intended to protect the induction electrically driven motor against abnormal working modes and has an improved quick action. It consists of three current transformers /10, 11, 12/, with primary /7, 8 9/ and secondary /13, 14, 15/ windings, connected in parallel , and to a resistor /16/ and a coil /17/. A reed switch /18/ is fixed in the coil /17/, to control an input switch /1/ and an operational amplifier /4/, which can shut down the unit /5/ in case of the abnormal working mode of the motor.
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