An electromagnetic relay module is an electronic control device that has a control system (also known as an input circuit) and a controlled system (also known as an output circuit), typically used in automatic control circuits
What is the relay output?
The relay outputs are located on the terminals marked with the schematic mark of the switch, they are used to switch two-state devices and can switch AC or DC voltage. The COM terminal is typically common, the voltage is then at the NO or NC terminal, depending on the relay state.
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