The choice of circuit breaker Voltage: 380V Current: 200A How to choose a circuit breaker Give the s

At present, the joint venture circuit breakers on the market (ABB, Schneider, Siemens, etc.) are rated at 690V, and even the economical ones have 440VAC, so the voltage is not a problem. The current needs to be amplified a little to use. One is to take into account the load, such as the motor with a relatively large starting current, so the rated current of the switch is selected to be larger, which can avoid the starting current.

In addition, if it is used in plateaus or other harsh environments, it is necessary to consider the problem of degrading, for example, in some cases, the 250A switch can only carry a 200A load. Therefore, it is recommended that you choose a 250A switch. Of course, it depends on your load and chooses the most suitable one according to the trip curve of the switch.

Summary. Hello, for your inquiry;

The electrical appliances in the unit building are single-phase 220V, the sum of the rated power is 280KW, and the electric current should be more than 1200 amperes The rated working current is 200A, but the general use of 100 to 150A is generally short-circuit and circuit breaking, and there are few overload breaks, if it is a small amount of overload, the circuit breaker with poor quality may not be broken to 250A.

What is the rated working current of the three-phase 380V 200A circuit breaker.

Hello, for your inquiry; The electrical appliances used in the unit building are all single-phase 220V, the sum of the rated power is 280kw, and the electric current should be more than 1200 amperes The rated working current is 200A, but the general use of 100 to 150A is generally short-circuit and circuit breaking, and there are few overload and circuit breaking, if it is a small amount or burn overload, the circuit breaker with poor quality may not be broken to 250A.

That's how it should be. That's all I have for this question, I hope it will be helpful to you

Summary. The 10kv vacuum circuit breaker models are divided into 10kv indoor vacuum circuit breaker and 10kv outdoor vacuum circuit breaker, the model is:

10KV Indoor Vacuum Circuit Breaker: VS1-12 Vacuum Circuit Breaker, ZN63-12 Vacuum Circuit Breaker, ZN28-12 Vacuum Circuit Breaker, ZN73-12 Permanent Magnet Vacuum Circuit Breaker, ZN23-12 Vacuum Circuit Breaker, ZN12-12 Vacuum Circuit Breaker.

10KV outdoor vacuum circuit breaker: ZW8-12 vacuum circuit breaker, ZW32-12 vacuum circuit breaker, ZW6-12 vacuum circuit breaker, ZW20-12 vacuum circuit breaker.

When the rated current is greater than 2000A, what models can be selected for 10kV circuit breaker? Urgently, thank you!!

The transformer has a rated current of only 115A

Circuit breaker model.

Therefore, a 400A vacuum circuit breaker is the only option.

Isn't the rated voltage of the circuit breaker greater than the maximum continuous operating current?

The rated voltage should also be greater than 10kV

You are looking for more than 10kv!

10kV vacuum circuit breaker models are divided into 10kV indoor vacuum circuit breaker and Qizi 10kv outdoor vacuum circuit breaker, the model is: 10kV indoor vacuum circuit breaker: VS1-12 vacuum virtual seepage circuit breaker, ZN63-12 vacuum circuit breaker, ZN28-12 vacuum circuit breaker, ZN73-12 permanent magnet vacuum circuit breaker, ZN23-12 vacuum circuit breaker, ZN12-12 vacuum circuit breaker 10kV outdoor vacuum circuit breaker:

ZW8-12 Vacuum Circuit Breaker, ZW32-12 Vacuum Circuit Breaker, ZW6-12 Vacuum Circuit Breaker, ZW20-12 Vacuum Circuit Breaker.

Current i = 200A. The current of the circuit breaker = should be 300A. The model is: molded case circuit breaker NF400-CW 300A.

Circuit breaker: A 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.

The circuit breaker can be used to distribute electric energy, start the asynchronous motor infrequently, protect the power supply line and the motor, and automatically cut off the circuit when they have serious overload or short circuit and undervoltage and other faults, and its function is equivalent to the combination of fuse switch and over/underheat relay. 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.

The circuit breaker needs to be 250A, and the opening is larger than the actual one, so the expansion should be considered.

The rated working current is 200A, but generally use 100 to 150A, generally short-circuit breaking, rarely overload breaking, if it is a small amount of overload, the quality of the circuit breaker may not be broken to 250A.

The situation you said is that the single-phase current, the three-phase current is not 1200A, it should be 280 * 1000 380, and the power you said should be the maximum power, the actual power is mainly measured by the ammeter, because the electrical appliances cannot all be fully loaded all the time, your unit 280kw rated power 425A current, the actual power with 200A switch is generally feasible, because the actual power is definitely less than 200A per phase

Of course, you can say that you are single-phase electrical equipment, your air opening is three-phase, each phase can pass 200A current, three-phase can pass 600A, then the two can pass 1200A, and your equipment rated power is 280kw, the actual operating power is less than this.

Of course, the rated working current is 200A, but it can only be said that it is usually controlled within 180A.