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The Relay is the most common used module in actually application such as home automation, and sometimes you need to control large current such as the air conditioning/water heater. That is what this Large Current Relay Module can be helpful. This Large Current Relay Module is a high quality Single Pole Double Throw Relay(SPST). When the relay not triggered, the 2 outputs is disconnected; when the relay is triggered (Logic Low), the 2 outputs are connected, the max current can be up to 3A@240VAC or 3A@30VDC, which would be enough for most of the home appliances.