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
J8
LED2
LED8
C1
Capacitance
Capacitance
LED7
J3
J4
J7
LED1
LED5
LED4
LED9
J2
J9
LED6
R1
Resistance
120 Ω
R7
Resistance
120 Ω
RLY8
R2
Resistance
120 Ω
R8
Resistance
120 Ω
R3
Resistance
120 Ω
RLY5
R5
Resistance
120 Ω
RLY3
R9
Resistance
120 Ω
RLY1
RLY2
RLY4
R6
Resistance
120 Ω
RLY6
R4
Resistance
120 Ω
RLY7
J1
U2
U1
U3

ESP32 8 Relay Board