The electromagnetic relay is essentially a switching device that can control the alternating current, that is, a device that effectively controls the alternating signal. It is a very important electrical component, usually composed of one or more small iron cores and rotating parts that are excited by external signals and transmitted to the device.
When these signals are transmitted to the device, it causes the iron core to create an effective attraction in the device to control the switch.
At this time, when the external signal is disconnected, the iron core will also be released and the switch will be closed. Therefore, it can effectively output low energy, low power, low voltage, low frequency or specific frequency signal output as a large amount of energy, large power consumption, large voltage, large frequency or specific frequency signal to make the device work.