How big is the air switch for a 22 kW motor?

Switches are generally used to limit the amount of current. Because the current is the most sensitive to the line resistance. Generally, the rated current of the switch is configured according to 20% of the flow rate.

You choose according to the rated current multiple, ordinary three-phase 22kw motor, the rated current is about 45A, then you choose 63-120A. If the reload is started and the startup time is very long, you can increase it a little.

Since there are two standards for power supply, one is household power supply 220V, commonly known as two-phase electricity, and the other is industrial power 380V, commonly known as three-phase electricity. So the current of the 22kw motor working at these two voltages is 22kw 220v = 1000a 22kw 380v = 58a.

Therefore, at 220V working voltage, a motor with a power of 22kW needs to be equipped with a 120A switch. The motor with a power of 22kW at 380V operating voltage. Only a 70A switch is required.

There are about 3 types of 20kw appliances:

1. Motor: The current of the three-phase motor is estimated to be 2A kW, and the current of 20kW is 40A, and the air switch of 50A or 63A can be selected.

2. Electric heating appliances (such as drying ovens), the actual electricity consumption of these electrical appliances is 220V, 20K 220 90A, if the three-phase average, each phase current is 30A, but the actual is not necessarily average, can not choose 32A, you can choose 50A, 63A, 80A is safer.

3. The total power of various household appliances. In modern families, air conditioners, freezers, TVs, rice cookers, vacuum cleaners are everything, if they run together, they need a current of 90A, but in fact they do not run at the same time, generally take 50%-60%, that is, 45-54A, so that 63A 1P or 2P air switch can be used as the main switch, and it also needs to be divided into several branch air switches, such as air conditioning switches (alone), lighting switches, power switches (with leakage protection), etc.

The current of the 22 kilowatt motor is about 44 amps, and the 60A one will have high sensitivity and is easy to trip by mistake, so it is better to use the 100A one.

If it is using 220V50Hz AC power, the kilowatt motor should be equipped with a 10A air switch.

If it is using 380V50Hz AC, the kilowatt motor should be equipped with a 4A air switch.

The calculation is as follows:

1. Single-phase 220V

kW = 2200 watts.

p=uii=2200÷220=10a

2. Three-phase 380V

p=i=2200÷（

According to the power and voltage, the current is calculated, and then the air switch is selected.

The air switch is a protection circuit, if the current exceeds the maximum allowable current, it will automatically jump the hidden switch, so that people can check the cause of such a large current in the circuit, eliminate circuit faults, and protect the power supply equipment of the power grid.

Summary. How big should the kilowatt motor be equipped with an air switch, hello, if it is with 220V50Hz AC, the kilowatt motor should be equipped with an air switch of C16A. If it is using 380V50Hz alternating current, the kilowatt motor should be equipped with an air switch of C6A.

How big should the kilowatt motor be equipped with an air switch, kiss hello, if it is with 220V50Hz AC power, the source tells that the kilowatt motor should be equipped with a C16A air switch. If the fruit is used with 380V50Hz alternating current, the kilowatt motor should be equipped with a C6A air switch.

Hello dear, the kilowatt needs 10A air opening If it is with 220V50Hz AC, the kilowatt motor should be equipped with a 10A air switch. If you are using 380V50Hz AC power, the kilowatt electric engine should be equipped with a 4A air switch.

Hello dear, 1, KW water pump to determine how big the air is used for the punch shirt motor, which needs to be analyzed separately according to the different voltage levels of the balance. 2. If the KW pump motor is 220 volt voltage level, then the working current of the KW pump motor is about 10 amps, considering the increase factor of starting current, use 16-20 amps of air switch to dig the cavity.

Hello dear, the calculation method is as follows: 1. Single-hall stupid phase 220V: kW = 2200 watts P = UII = 2200 220 = 10A2, three-phase 380VP = According to the power and voltage, calculate the current, and then select the air switch.

The air switch is a protection circuit, if the current exceeds the maximum allowable current, it will automatically trip, so that people can check the cause of such a large current in the circuit, eliminate the circuit and pretend to be an early companion, and protect the power supply equipment of the power grid.

A 55 kW motor requires a 200 or 300 amp air switch.

The total current of the 55 kW motor is: 55000 380=. The multiplier switching current is. Take 2 times the switching current as. The above is the calculation process.

Selection conditions and requirements: The air switch of the motor should usually be selected more than 1-2 times the switching current. If you don't use the switch often, you can take the 200A air switch. If you use the switch frequently, you can take the 300A air switch.

55 kilowatt motor, usually have to be matched with the motor starter, it is not allowed to start the motor directly with an air switch, because when the motor starts, the starting current is usually more than 3-5 times the total current of the motor, and the greater the power, the higher the induction voltage, therefore, greater than the pure 10 kilowatt power of the motor, for the sake of safety, it is not allowed to use the air switch to start directly.

Expansion: Therefore, the air switch of the high-power motor is generally used for maintenance and power-off, not for starting, so it is not necessary to take the switching current with too large magnification to save operating costs. ‍

Summary. Hello dear. Motor current calculation:

P= 3 U i Cos i=P ( 3 U Cos )= The choice of air opening of the motor is generally selected according to the times of the rated current, and the current of the times is 15A, and the three-phase air opening of the motor with 20A is suitable.

Hello dear. Calculation of the current of the closed search liquid motor: p= 3 u i cos i=p ( 3 u cos )= The choice of the motor air opening is generally the choice of the leakage field according to the times of the rated current, the current of the car is 15A, and the three-phase air opening of the motor with 20A is suitable.

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The 22kw motor is open from 63 to 120 air.

22kw motor quota fixed source noise current 63A air open. Calculate the rated crude current of 22kw three-phase AC motor is about. The air switch selection should be the rated current of the motor times, then )a.

Therefore, it is possible to choose an air switch with model number DZ and a rated current of 63A. (Air switches with a rated current of 80A are also selected.)

Calculation of motor power consumption.

Three-phase motor power consumption = three-phase motor power x running time. Three-phase motor power: X-line grinding voltage, X-line current, x power factor. (Line voltage--- voltage between three phases, line current--- current per phase, power factor --- about general).

Single-phase motor power consumption = single-phase motor power x running time.

DC motor power consumption = DC motor power x running time. DC motor power = voltage x current. <>

How big air switch do I need to buy for a 20 kilowatt electrical appliance?

20 kilowatts can be opened with an air of 50A or 63A. Generally, household appliances will not run at the same time, generally take 50%-60%, that is, 45-54A, so that 63A 1P or 2P air switch can be used as the main switch, and it also needs to be divided into several branch air switches, such as air conditioning switches (alone), lighting switches, power switches (with leakage protection), etc.

Summary. The rated current of the 132kw motor, from 2 poles to 10 poles, is about 238A 275A. Therefore, you can choose a molded case circuit breaker with a rated current of 400A and a rated current of 315A.

An air switch, also known as an air circuit breaker, is a type of circuit breaker. It is a switch that automatically disconnects whenever the current in the circuit exceeds the rated current. The air switch is a very important electrical appliance in the low-voltage distribution network and the power drive system, which integrates control and a variety of protection functions.

In addition to completing the contact and breaking circuits, it can also protect the circuit or electrical equipment from short circuits, serious overloads and undervoltages, and can also be used to start the motor infrequently.

The rated current of the 132kw motor, from 2 poles to 10 poles, is about 238A 275A. Therefore, you can choose a molded case circuit breaker with a rated current of 400A and a rated current of 315A. An air switch, also known as an air circuit breaker, is a type of circuit breaker.

It is a switch that automatically disconnects whenever the current in the circuit exceeds the rated current. Air switch is a very important electrical appliance in low-voltage distribution network and power traction system, which integrates control and a variety of protection functions in one of them. In addition to completing contact and breaking circuits, it can also protect circuits or electrical equipment from short circuits, serious overloads and undervoltages, and can also be used to start motors infrequently.

I used a universal circuit breaker 400a and it jumped when it started.

Normal load will not trip, overload will, and overload is only one of the reasons for tripping, and there are 3 reasons for tripping according to different circuit breakers. There are two kinds of circuit breakers, ordinary circuit breakers and leakage circuit breakers. Ordinary circuit breakers only trip when the circuit is overloaded or short-circuited, while leakage circuit breakers have more leakage trip functions than ordinary circuit breakers.

Take my leakage circuit breaker as an exampleYesterday it rained heavily in Guangzhou, and as a result, the outdoor monitoring leakage tripped. As you can see from the picture, there is a black protrusion on the bottom right, which is the reset button. Generally speaking, the tripping protruding reset button is caused by a short circuit, and the trip caused by overload will not protrude.

The tripping caused by overload and short circuit is very easy to distinguish, just turn off all the electrical appliances connected to the slag circuit breaker and then close, if not repeated tripping is caused by overload, otherwise it is purely caused by short circuit.

The starting current reaches 1337A, which exceeds the rated current.

Exceeded.