The difference between miniature circuit breaker and molded case circuit breaker

Miniature circuit breakers and molded case circuit breakers.

All belong to circuit breakers, and the working principle is the same. The difference is that:

1.The miniature circuit breaker is installed on rails.

Installation, the molded case circuit breaker is screw mounted;

2.The maximum current level of the miniature circuit breaker is within 63A, and the current level of the molded case circuit breaker is up to 2000A.

Miniature circuit breaker: Electrical parameters.

a.Comply with electrical standards: EN0898 (IEC898), GB10963;

b.Rated voltage.

ue)：230/400v;50/60hz;

c.Rated short-circuit breaking capacity ICU: 10KA IEC898 (1 63A);

d.DC short-circuit breaking capacity: maximum 48V (S-5SJ4......, 10kA) unipole max. 250V (S-5SJ4-DC, 6kA) monopole.

e.Trip characteristics: B, C, D characteristic curves.

f.Fuses that can be edged up to the max.

100a gl(>10ka)

g.Selectivity level: 3

h.Operating ambient temperature: -5 to +40

i.Enclosure rating: IP40 (after installation).

j.Lifespan: electrical, no less than 8,000 times of on/off action Mechanical, not less than 20,000 times of on/off action.

The plastic case includes the small one, which generally refers to the household 2-phase or 3-phase small current circuit breaker.

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Miniature circuit breakers include DZ47 and CDB series, with rated current A;

The molded case circuit breaker has CDM series, which are rated greater than 63A, which is suitable for high-current equipment.

1. Differences in meaning.

The plastic case circuit breaker can be used to turn on and off the load circuit, and can also be used to control the plastic case type motor that starts infrequently.

Ordinary 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.

2. The difference in function.

Plastic enclosure circuit breakers are generally used for power distribution and can also be used to protect electric motors. Under normal circumstances, the circuit breaker can be used for infrequent conversion of the line and infrequent starting of the motor.

The function of the ordinary circuit breaker is to cut off and turn on the load circuit, as well as cut off the fault circuit, prevent the expansion of the accident, and ensure safe operation. The high-voltage circuit breaker should break the arc of 1500V and the current is 1500-2000A, which can be stretched to 2m and continue to burn without extinguishing.

3. Differences in use.

Plastic enclosure circuit breakers are used to distribute electrical energy in the distribution network and to protect lines and power supply equipment from overload, short circuit and undervoltage. Circuit breaker for protection motor, used in the power distribution network for starting and breaking of squirrel cage motors and as overload, short circuit and undervoltage protection of rat motors. Undervoltage protection also requires the addition of a shunt tripper.

The purpose of ordinary circuit breaker is to distribute electric energy, start asynchronous motors infrequently, protect power lines and motors, and automatically cut off circuits when they occur serious overload or short circuit and undervoltage and other faults, and its function is equivalent to the combination of fuse switches and over/underheat relays.

Since both belong to circuit breakers, and molded case circuit breakers are mostly used for small-capacity on-off and on-off, what are the differences between molded case circuit breakers and miniature circuit breakers? We must understand the difference between the two and make the right choice when buying. Next, I will give you a brief explanation, I hope it will be helpful to you.

Let's talk about the basic similarities first, because both are circuit breakers, both need to comply with some basic product standards, and have the same working principle. Let's talk about the differences between the two, in general, there are the following points:

1.The electrical parameters are different.

2.The mechanical parameters are different.

3.The working environment is different.

In addition, from the perspective of purchasing, let's talk about a few differences between the two.

Current level: The current level of molded case circuit breaker is up to 2000A. The maximum current level of the miniature circuit breaker is within 125A. Due to the gap between the two in terms of capacity, in specific work, the effective area of the molded case circuit breaker is also greater than that of the miniature circuit breaker, and the connected wire is also relatively thick, which can reach more than 35 square meters, while the miniature circuit breaker is only suitable for connecting wires below 10 square meters.

Therefore, generally for indoor conditions, it is more suitable to choose a molded case circuit breaker for larger rooms.

Installation method The molded case circuit breaker is mainly screw mounted, which is easy to compress, good contact and stable operation. The miniature circuit breaker is mainly installed through the guide rail, and sometimes the contact is poor due to insufficient torque. Due to the different installation methods of the two, the installation of molded case circuit breakers is more stable and less difficult than that of miniature circuit breakers.

Operation & Life.

Operationally. The molded case circuit breaker adopts two sets of devices to protect the over-current and short circuit respectively, and the over-current protection action value can be manually adjusted, which is convenient and fast. The miniature circuit breaker shares a set of devices for overcurrent and short circuit, and the current is not adjustable, resulting in many times the problem cannot be solved.

The molded case circuit breaker has a large interphase distance, and has an arc extinguishing cover, strong arc extinguishing ability, can withstand greater short-circuit current, and is not easy to cause interphase short circuit, so the service life is also better than that of the miniature circuit breaker.

Flexibility of use.

In this regard, the molded case circuit breaker is more prominent, and it is better than the miniature circuit breaker in terms of flexibility in setting. The over-current and short-circuit protection devices of the molded case circuit breaker are independent, and the action value of the over-current protection can be flexibly adjusted during use. The over-current protection and short-circuit protection of the miniature circuit breaker are unified devices, and there are certain deficiencies in the adjustment flexibility.

According to the above situation, it seems that the miniature circuit breaker is at a disadvantage, but in fact, for some times, it is still necessary to choose the miniature circuit breaker. For example, when it is necessary to improve the safety of the line, because the miniature circuit breaker has high action sensitivity and fast breaking action, it is more conducive to the protection of the line and electrical appliances.

My conclusion: The above introduces the difference between molded case circuit breaker and miniature circuit breaker, so we can see that both have their own advantages and suitable places, the key is to fully understand the difference between molded case circuit breaker and micro circuit breaker, and choose according to your own needs. What, decoration with your own money ?!

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For the safety of electricity, many people will install circuit breakers in their lives. What is the difference between these two types of circuit breakers?

1. From the appearance, the size of the two is not the same. The volume of the frame circuit breaker is a little larger, while the volume of the molded case circuit breaker will be relatively smaller.

2. The frame circuit breaker has many functions such as measurement, assistance and protection, which is relatively sensitive, and can judge the circuit situation in time and start the circuit breaker to protect the circuit. The molded case circuit breaker has several different circuit breaking methods, and different protection types can be selected according to the actual situation, and the selectivity is relatively high.

3. The rated current of the frame short-circuit is 400A 6300A, when it exceeds this range, there will be a broken circuit, which is generally used in some network work. The rated current of the molded case circuit breaker is 10A 800A, as long as it is used frequently in the work of some electrical appliances.

2. Precautions for the use of frame circuit breakers and molded case circuit breakers.

1. When installing frame circuit breakers and molded case circuit breakers, be careful not to install them in places with relatively high temperatures. Prolonged high temperatures can cause them to mistakenly think that the heat generated by the current is caused by the current, so that the judgment error will lead to the breaking of the circuit.

2. The frame and plastic shell circuit breaker should not be installed in a place with high humidity, if this place is relatively humid, it will affect its normal use.

3. Pay attention to the scope of use of these two circuit breakers, and install appropriate circuit breakers for different circuits. If they exceed their range, they will not play a corresponding role, and it is easy to burn out the circuit breaker.

Article summary: The difference between frame circuit breaker and molded case circuit breaker is that the frame circuit breaker is larger than the molded case circuit breaker, the frame circuit breaker is more sensitive, and the molded case circuit breaker chooses more circuit breaking methods. In addition, the scope of use of the two is also different.