Electromagnetic relay is a kind of relay widely used. According to different power supply, electromagnetic relay can be divided into AC relay and DC relay. It can also be divided into current relay and voltage relay according to different connection methods of coil and power supply. The coil of the current relay is connected in series with the power supply circuit, with the current as the input; The coil of the voltage relay is in parallel with the power supply, and takes voltage as the input.
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