How to choose the circuit breaker of the water pump and how to choose the circuit breaker?

If it is a single-phase motor, the rated current.

for 75a; Three-phase motor.

Approximately 30a; Contactors.

It should be used to times the rated current, and the circuit breaker is selected for motor protection, with circuit breaker: RMM1-100 33002 50A or motor comprehensive protector, ** is not expensive.

Circuit breaker (English name: circuit-breaker, circuit breaker) refers to a switchgear that can close, carry and break the current under normal circuit conditions, and can close, carry and break the current under abnormal circuit conditions within a specified time. Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their scope of use, and the division of high and low voltage boundaries is relatively blurred, and generally more than 3kV is called high-voltage electrical appliances.

Circuit breakers can be used to distribute electrical energy and start asynchronous motors infrequently.

It protects power lines and motors, and automatically cuts off circuits when they have serious overloads, short circuits, undervoltages, etc., and its functions are equivalent to fuses.

type switch and underheating relay.

and so on. In addition, it is generally not necessary to change the parts after the fault current is switched off. At present, it has been widely used.

In the generation, transmission and use of electricity, power distribution is an extremely important link. The power distribution system includes transformers and various high and low voltage electrical equipment, and the low voltage circuit breaker is a kind of electrical appliances that are widely used.

Whether to choose Schneider's circuit breaker, I don't know how much current to choose to drive the 11kw pump, and whether there are other loads.

The 11kw water pump should be driven by a three-phase motor, the three-phase 380v working current is 2A, and the rated current of 11kw is estimated to be 22-23A

Therefore, the circuit breaker should be selected between 33---55A The circuit breaker specifications are generally 5A, 10A, 15A, [16A], 20A, 25A, 32A, 40A, 63A, 100A, etc., so choose 40A circuit breaker.

37kw, 22kw choose 100a choose 10a

If you tell you a way, you can choose it yourself, mainly depending on his rated current.

The most general calculation is that a kw = = 2 currents (380v3 phases) 11kw = = 22 currents, and then magnify times that is, the current of the circuit breaker is selected to 25-30a. If it is started directly, magnify to a double. No problem!!

In addition, the 37kw 64 current short-circuit can be selected from 80-100A. Similarly, unification below 4kw can be used with 10a15a.

11 kilowatt motor can choose 25A, not more than 32A

The circuit breaker of 6A is sufficient, and it is best to choose leakage protection.

6a's yes. 16 or 20 circuit breakers are fine.

This configuration is sufficient, but you often start and stop, in a high-current working state, obviously it is not enough, the circuit breaker you can match 225S-125A, the contactor is changed to CJ20-125A, in addition to the wiring screws, must be tightened. There is also a micro-capacitor solution that can be applied to the contact.

The screws of the pile head are not tightened at the beginning, the pump is tight at the beginning for a long time, and the wire will cause the screws to become loose after heating, it is recommended that you make a wire nose at the end of the wire and then install it to the empty opening, so that the screws will not be loose, try to solve this problem.

Choose D series 80-100A to open empty. Choose 25 square copper wire.

The wire is not compressed, and it is possible that the wire diameter is thin.

The rated current of the motor is used to determine the setting value of the long-delay action current of the circuit breaker.

The return time of the setting value of the 6 times long delay action current of the circuit breaker is greater than the actual starting time of the motor.

The setting value of the instantaneous action current of the circuit breaker shall be 8 15 times the rated current of the tripper for the cage motor and 3 6 times the rated current of the tripper for the winding motor.

In the home power supply, the circuit breaker is usually used as a main power protection switch or branch line protection switch. In the event of a short circuit or overload in the line or household appliances, the circuit breaker can automatically trip and cut off the power supply, thus effectively protecting these devices from damage and minimizing the accident.

In the family, a single pole is generally used for branch protection, and a two-pole circuit breaker is used for total power protection. It is very important to choose the rated capacity current of the circuit breaker in the family, because if the rated current of the circuit breaker is too large, when the line or household appliances are short-circuited or overloaded, the circuit breaker can not automatically trip and cut off the power supply.

The 14kW circuit breaker can be selected with 40A D-type micro-break and 23-32A thermal relay. 9KW optional 25A D-type micro-break, 16-24A thermal relay. 5KW optional 16A D-type micro-break, 9-13A thermal relay.

If the molded case circuit breaker is selected, the current can be selected the same, and the single magnetic trip.

The motor power multiplied by 2 is equal to the current, the circuit breaker is taken as 2 times the current, and the contactor is taken as the specification that includes the number of currents. If it is exactly the same as the size of the contactor, the larger size should be used. In the case of thermal relays, the current is located in the middle of the upper and lower limits of the thermal relay.

Guaranteed adjustable. Yes, it also depends on whether you start frequently.

It is mainly to be used with your contactor and motor power, your thermal relay current can be about 30A, Schneider contactors are also divided into N type and C type, such as LC1 series, there are N types below 40A, and N types are also called economical.

If the 15kw motor is a single-phase rated current of 75A and a three-phase, it is about 30A, and the contactor should use a circuit breaker with a multiple of the rated current. **It's not expensive, in fact, I personally think that the use of domestic upstream brands is also cost-effective, and it is very important to consider using imported places.

Support the answer of 1 3 floors, but I still recommend that it is better to start with a star triangle. FYI.

15kw three-phase asynchronous motor, rated current of about 30A, 1, circuit breaker: mainly used for short-circuit protection, with load opening and closing, can choose 40A or 60A, what model is used, depending on the price and quality, *** take the low value, the second take the high value, 2, thermal relay: mainly used for overload protection, can be selected 20A 40A, adjust to slightly less than the rated current, 3, motor comprehensive protector: mainly used for overload, phase loss protection, can be selected 10 60kw The integrated protector does not require a separate thermal relay.

One. Considering that you are powered by a three-phase power supply, the total incoming line current is i=20, and the total switch is 100A.

Two. Of course, if the load of the three floors is the same, the capacity of the circuit breaker is only 100 3 = 33A, and the circuit breaker of 50A is enough.

Three. The selection of the above two-sided three-tool switch is relatively conservative, generally, it is enough to take the multiple to 2 times of its calculated value.

Four. The main switch of the original line 200A and its sub-switches are a bit too conservative, and there is really no need to get too large.

The ** of NM1 products is the latest product in China, the quality is good, 100 is the molded case frame grade, the rated current is 100A type, that is to say, 100 40A, 80A and 100 63A The molded case grade is 100A, 63A is the rated working current. The circuit breaker is selected according to the power of the load and the starting current. The rated current of the pump and fan is about 40A, and the starting current is generally 3-7 times of the rated current, so the selection is generally a larger specification, that is, 63A, so that the circuit breaker will not cause excessive temperature and overcurrent, and prolong the service life.

Don't worry too much about the starting current, the starting current is instantaneous, and the circuit breaker has the ability to withstand instantaneous overcurrent. I hope you are satisfied with this answer.

Count according to p=ui.

20000w=220v*xa

x about 100a

Choose one greater than 100a.

1. You don't know all, don't mess with others, okay? Do you know how many amperage meters are rated for in rural areas? I even said 16???

There is also a comrade who suggested using 32a? What's more bullish is 40a?? If you all use these, then your meter is really tiring.

It's overloaded every day. The electricity meters in the countryside are all 10a!! Remember!!

In order to protect the meter, it is recommended to use 10A, and I use 10A, which is so easy to use. The load is too large to trip immediately, which protects both the meter and the line! If you don't understand, you have to ask, don't pretend to understand! ~~

It is recommended to use 32A for the total air switch in the household, and then install a single-pole air switch in a separate circuit, 3A for the general line and 16A for the air conditioner.

The main switch is 40A, and the shunt is 5-16A

More than 20A is recommended to use a 32A circuit breaker.