The meaning of miniature circuit breaker model and the difference between D type and C type

Model meaning of miniature circuit breaker

I believe that many people will be distressed when selecting the circuit breaker, because there are too many letters and numbers in the model, it is really unclear what exactly represents which parameters. Next, I will mainly talk about how to judge the meaning of the miniature circuit breaker model, so that you can quickly grasp the approximate parameters of different types of circuit breakers. Examples are as follows.

◆Miniature circuit breaker DZ47-63-C16 model

1. Generally, the first letter represents the manufacturer's product series code, such as DZ here;

2. The number 47 at the back also belongs to the product design serial number. The selection of a suitable and reasonable miniature circuit breaker usually starts from the first space of the model;

3. 63 in the above model means that the device can reach a maximum current of 63A;

4. The letter C represents the characteristics of the tripping curve, this type is suitable for lighting power distribution or motor power distribution places;

5.The number 16 means that when the rated voltage can reach 400V, if the current in the circuit reaches or exceeds 16A, the miniature circuit breaker of this type will automatically trip. Common rated currents are 16A, 25A, 32A, 40A, C50A, 63A, etc.

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Note: Some models are also marked with the number of poles such as 1P, 2P, 3P, 4P, etc., and other letters are added to the product design serial number to indicate the short-circuit breaking capacity, such as iC65N and iC65H in the Schneider iC 65 series Similarly, where N is up to 6kA and H up to 10kA. Finally, some manufacturers' miniature circuit breaker model codes are divided into internal (used when ordering) and external (marked by the circuit breaker shell). The above is just a brief introduction to the meaning of the external model. For more parameters, it is recommended to check the corresponding manufacturer's product Information such as manual samples will be more detailed and clear.

The common parameter terminology printed on the shell of the miniature circuit breaker:

◆A: Rated voltage;

◆P: number of poles;

◆Ue: rated voltage;

◆Ui: Rated insulation voltage (V);

◆Umax: Maximum working voltage (V);

◆Umin: Minimum working voltage (V);

◆Hz: rated operating frequency;

◆Uimp: rated impulse withstand voltage (kV);

◆Icn: Rated short-circuit capacity (kA);

◆Icu: rated ultimate short-circuit breaking capacity (kA);

◆Ics: rated operating short-circuit breaking capacity (A);

◆Trip characteristics: B, C, D, MA.

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The difference between D type and C type miniature circuit breaker

According to the requirements of Chinese national standards, the trip current of a qualified type D circuit breaker should be about 10 to 14 times the rated current, while the trip current of the C type circuit breaker is about 5 to 10 times the rated current. . It mainly depends on whether the circuit design current and the actual rated current of the switch are suitable. If it is reasonable, type C is usually suitable for lighting circuits, and type D is suitable for industrial fields.

The difference between D type and C type in Schneider miniature circuit breaker iC65 series

In fact, the straightforward point of the trip curve is to look at the time used for tripping, and the iC65 series has three instantaneous magnetic tripping action curve characteristics, including B, C, and D, as in specific situations.

◆Type B=(3-5)In, the formula indicates: the tripping action is performed when the instantaneous current is 3 to 5 times the rated value, and it is applied to pure resistance load scenarios such as electric rice cookers.

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◆Type C=(5-10)In, generally suitable for micro-inductance load scenes such as fluorescent lamps and street lamps.

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◆Type D=(10-14)In, suitable for inductive load scenarios such as pumps.

Transmitter|Encoder|Soft starter|Power supply|VFD|Light curtain|Servo products|Human-machine interface|Solenoid valve|Cylinder|Actuator|Flow meter|Transformer|Thyristor|Sensor|Deceleration drive gearbox reducer|Linear guide|Circuit breaker|Refrigeration compressorAll industrial products of okplazas are purchased from the original factory or formal channels of agents to ensure the original authenticity, which perfectly solves the problem of industrial product sample procurement and small-batch procurement for the majority of engineers and purchasing personnel.

The above is the meaning of the miniature circuit breaker model and the difference between Type D and Type C. I hope to help you. You can log in to the okplazas.com motor store to view the product information of circuit breakers. Welcome to email: [email protected] for consultation, and you can also contact WeChat customer service +86-13689242098 online for product consultation!