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Three-phase motors use relays to prevent phase-to-phase commutation circuits
Source: InternetPublisher:通通 Updated: 2014/09/14
As shown in the figure, an intermediate relay K is used and its coil is connected to the main line. If the main contact sticks to the main line and is charged, or the arc is not extinguished, K will pull in, causing the normally closed contact K to disconnect the STF and STR circuits, so the motor cannot be started whether the forward or reverse button is pressed.
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