Relay is a kind of electronic control device, through which low-voltage controller can be used to control high-voltage electrical appliances. It has a control loop (output)<br>The high voltage control system can be separated from the low voltage control system. Depending on the type of input signal,<br>Relay can be divided into current relay, voltage relay, temperature relay, pressure relay and time relay<br>. It can also be divided into electromagnetic relay, electronic relay, electrical relay, inductive relay, optical relay, thermal relay, etc<br>
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