Chandelier brightness controller circuit 2

(2) Chandelier brightness controller circuit 2
    The circuit is shown in Figure 2-76. It is based on Figure 2-75 and adds some components to control the lighting
chandelier with 5 bulbs .
    When the power switch is closed for the first time, the relay KAi is closed, and the lamps ELi and ELz are lit; when SA is disconnected, KA]
is released, ELi and ELz are extinguished, KAz is closed, ELa~ELs are lit, and then (after Is ), then close SA,
then EL3~ELs are still on; disconnect SA again, and then close SA after a few seconds, then the lamps ELi-ELs are all on.