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The lifting hook motor protection device is mainly thermal relay, but the thermal relay has low sensitivity, large error, poor stability and unreliable protection.
The fact is that even though many devices have thermal relays, there is still widespread damage to normal production.
The lifting hook has less heat capacity and less load capacity;
Again because of the increase in the degree of production automation requirements often run in the frequent starting and braking, and reversing and variable load and so on a variety of ways, puts forward higher requirements on motor protection device.
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