When the three-phase AC asynchronous motor is working, its current exceeds the rated value, we call it overcurrent; If the time is too long, it will cause the motor to overheat and damage, so we need to take necessary protective measures. Here is a simple understanding with Senli Motor Xiaobian!

       Generally, overcurrent is caused by too much load or incorrect start.Three-phase asynchronous motorWhen the overcurrent is generated, the current can still flow through the normal path, but its value is smaller than the short-circuit current value. In order to avoid affecting the normal operation of the asynchronous motor, the value should be slightly larger than the normal starting current when we set the overcurrent protection.

       The overcurrent protection we use is generally an overcurrent relay, which can protect the device from instantaneous action.

       Expand knowledge: the operating current exceeds the rated value and the winding overheats called overload; There are many reasons for overload, such as sudden increase of load, reduction of power supply voltage, motor bearing wear and so on. Overload protection should use thermal relays or motor protectors as protective elements.

       In general, in the same circuit, the overload protection action current value is smaller than the overcurrent, and both of these are smaller than the short circuit protection action current value.

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