Using a 380V contactor, an intermediate relay and an electric contact pressure gauge to control the automatic water supply of 3-way water pump It's better to have a physical wiring diagram Depending on the pressure, the coil voltage of contactor is 380V, and that of intermediate relay is 380V

Contactor coil voltage, intermediate relay coil voltage, the condition is not enough!
What you said is that the monitoring pressure of the pressure gauge is used to automatically drive the intermediate relay, and then the intermediate relay is used to drive the contactor,

What's the difference between 380 V / 220 V and 220 V / 380 V
I hope to be more detailed

380V / 220V is a power transformer that reduces 380V voltage to 220V!
220 V / 380 V is a power transformer that increases the voltage from 220 V to 380 V!
Under the premise of power and wire diameter, this kind of transformer can be used in both positive and negative ways!

What is the difference between 380V and 220V line voltage

You talk about this line voltage of 220 V is obtained by transformer transformation, and the secondary side of the transformer is ungrounded. It is generally used in three-phase ungrounded system with ground insulation

In an electric oven powered by a home circuit, the heater consists of four alloy wires with a resistance of 44 ohm
【1】 What's the power of this electric oven?
【2】 How much heat does this electric oven produce in 10 minutes?
【3】 How many kilowatts of electricity does this electric oven consume when it works for 2 hours?

P=UI=220V/44Ω*220V*4=4400W
Q=I2RT=(220V/44Ω)2*44Ω*4*10min*60=2640000J
W = Pt = 4400w * 2H * 60 * 60 = 31680000 = 8.8 degrees

Using a 380V contactor, an intermediate relay and an electric contact pressure gauge to control the automatic water supply of 3-way water pump It's better to have a physical wiring diagram Depending on the pressure, the coil voltage of contactor is 380V, and that of intermediate relay is 380V