U2 Component Overview

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please explain what U2 does.
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is the relay suited for switching 400V
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2
LED3
LED2
LED8
R1
Resistance
120 Ω
LED7
R7
Resistance
120 Ω
R2
Resistance
120 Ω
LED1
LED5
R8
Resistance
120 Ω
LED4
R3
Resistance
120 Ω
LED9
R5
Resistance
120 Ω
R9
Resistance
120 Ω
R6
Resistance
120 Ω
R4
Resistance
120 Ω
LED6
J8
J3
J4
J5
J7
J6
J2
J9
C1
Capacitance
Capacitance
RLY8
RLY5
RLY3
RLY1
RLY2
RLY4
RLY6
RLY7
J1
U2
U1
U3

ESP32 8 Relay Board