Relay is a kind of electronic control devices, through the relay can use low voltage controller to control high voltage electrical appliances, it has control loop (output)<br>It can separate the high voltage controlled system from the low voltage controlled system. According to the class of the input signal<br>The 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, electric relay, inductive relay, optical relay, thermal relay, etc.<br>
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