The device is attached to the outside of the telephone , and only the contact point of the contact spring of the pressure spring of the telephone is connected with the contact of the relays J2-2 and J2-3. It can intercom within 2 meters without having to pick up the headset and can hear the call. When no one answers, the wait state is automatically restored.
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Household Appliances Control Relay
Household Control Relay is used for household appliances on the relay, is a common device in the automatic control system, generally used to connect and disconnect the circuit, is an important part of the automatic control and remote control circuit.
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