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Question:

What is the meaning of the small current of the relay to control the high current?

What is the meaning of the small current of the relay to control the high current?

Answer:

The relay is composed of the core of the coil with the solenoid, the coil connected to the control circuit, when the coil connected to a smaller current, the electromagnetic core will have a strong suction force, to the main contact connected, the main contact Contact large pressure, the main contact will be able to connect a larger current load power. So small current can control the high current.
May 9, 2017
The relay coil turns a small current through the contacts to control the large current.
May 9, 2017
This is a general argument that the intermediate relay can use its own coil to maintain a small current pull or release, to control the main circuit in the larger current ~
May 9, 2017

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