Reverse power relay a reverse power relay is a relay with a wattmeter movement that senses the direction of power flow.
逆功率继电器逆功率继电器是指带瓦特计的继电器，用来感知电流的方向。
Reverse power relay a reverse power relay is a relay with a wattmeter movement that senses the direction of power flow.
逆功率继电器逆功率继电器是指带瓦特计的继电器，用来感知电流的方向。
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