Relay Power Saver Circuit Diagram

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Usually, relays operate at current level where it may originate the mechanical metal contactors apparent movement. After contacts has been accomplished, the current level has to be kept the conductor plates stay attached is actually smaller than the current to initiate it. This power saver circuit seems to have opposite mechanism of spike suppressor. This circuit provide surge current to initiate mechanical movement, but after that, this circuit accelerator the current to save the power, allow lower current level just to keep the contacts stay attached. Here is the circuit diagram :

relay power savers circuit