This device in your photos is a Single-Phase Motor Control Box.
Single-Phase Motor Control Box
What It Is
A motor control box is used to start, control, and protect a single-phase electric motor.
It is commonly used for water pumps and small electric motors.
What Is Inside
Inside the control box there are usually:
Capacitor – helps the motor start and run smoothly
Thermal protector (overload protector) – protects the motor from overheating
Terminal connections – for wiring power and the motor
Power Range
From the label on the box, it can work with motors like:
0.33 HP
0.5 HP
0.75 HP
1 HP
1.5 HP
Up to about 4 HP (depending on capacitor size)
Where It Is Used
Borehole pumps
Water booster pumps
Surface water pumps
Small agricultural motors
Main Functions
Helps the motor start
Protects the motor from overload
Improves motor performance