CHINT Защита двигателя JD-8-2A-30A

JD-8-2A-30A is a comprehensive motor protector of the CHINT brand, mainly used for protecting three-phase AC asynchronous motors against faults such as overload, phase loss, and overcurrent. The following is a detailed analysis based on the existing information:

1. Основные функции и технические параметры
2. Функции защиты

Защита от перегрузки: Monitor the motor current through the inverse time-delay characteristic (4-60 секунды). When the current exceeds the set value, the circuit will be automatically cut off.

Phase Loss Protection: Detect the imbalance of three-phase current. When any phase is missing, the protection will be triggered within 2 секунды.

Overcurrent Protection: Support rapid response to short-circuit faults (<0.2 секунды).

Other Functions: Some models support undervoltage, overvoltage, and leakage protection (specific models need to be confirmed).

2. Electrical Parameters

Номинальное напряжение: AC220V/380V (±15%).

Current Range: According to the search results, the JD-8 series includes specifications such as 0.5A～5A, 2A～20A, and 20A～80A. А “30А” mentioned by the user may belong to the range of 20A～80A, but it should be noted that there may be differences in the model naming rules (такой как “JD-8 20A～80A”).

Контактная емкость: AC220V/5A, AC380V/3A, and the electrical life is >1 million times.

3. Installation and Dimensions

Способ установки: Standard 35mm guide rail or fixed with screws.

Overall Dimensions: Approximately 143mm×66mm×157mm, and the split display distance is ≤5 meters.

1. Model and Application Scenarios
2. Анализ модели

JD-8: Код серии, representing the CHINT comprehensive motor protector.

2A-30A: It may refer to the setting current range (such as 2A～30A), but it should be noted that the official CHINT models are usually named in the form of “JD-8 0.5A～5A”. If the model provided by the user is accurate, it may be a customized version or a model for a specific market.

2. Applicable Motors

Power Range: According to the current range, the 2A～30A model is suitable for three-phase motors with a power of approximately 1～15kW (the specific current-power correspondence table needs to be referred to).

Application Scenarios: Widely used in industrial equipment (such as pumps, fans, compressors), agricultural machinery, and household electrical appliances to prevent the motor from being damaged due to faults such as overload and phase loss.

III. Сертификация и соответствие

1. Внутренняя сертификация: Passed the CCC certification (China Compulsory Product Certification), meeting the domestic electrical safety standards.
2. International Certification

Сертификация UL: The existing search results do not clearly mention that the JD-8 series has passed the UL certification. If it needs to be used in the US market, it is recommended to contact CHINT to confirm whether there is a UL-certified version or an alternative model.

Other Certifications: Some models may comply with the CE certification (EU), and specific models need to be queried.

1. Installation and Wiring
2. Способ подключения

Main Circuit: The three-phase power line is directly connected to the L1, L2, and L3 terminals of the protector, and the motor line is connected to the T1, T2, and T3 terminals.

Control Circuit: The auxiliary contacts (normally open/normally closed) are used to connect the contactor coil or the alarm device.

Current Transformer Configuration: For large-current models (such as 20A～80A), it is necessary to use with a current transformer (such as RT36-00/160).

2. Меры предосторожности при установке

– Avoid using it in an environment with high temperature (>40℃), humidity, or strong electromagnetic interference.

– Regularly check whether the wiring terminals are loose to ensure good contact.

1. Покупка и альтернативные решения
2. Каналы закупок

In the United States: According to the current search results, for local suppliers in the US of China Electric, it is recommended to query the international distributors through the official CHINT website www.transformerandswitchgear.com or contact the agents.

2. Альтернативные модели

– If the JD-8-2A-30A is discontinued or does not have a UL certification, you can consider the CHINT JD-5 series (such as JD-5 20A～80A) or similar products of other brands (such as Delixi, АББ), but pay attention to the matching of the current range and functions.

1. User Feedback and Common Problems
2. Reliability: User evaluations show that the JD-8 series performs stably in conventional industrial environments, but it should be noted that there may be misoperations in high-temperature environments.
3. Debugging Suggestions

– The setting current needs to be set according to the parameters on the motor nameplate to avoid overprotection or insufficient protection.

– If tripping occurs frequently, check whether the motor load is abnormal or whether the wiring is loose.

VII. Резюме и предложения

Основные преимущества: Comprehensive functions and high cost performance, suitable for the basic protection needs of small and medium-sized motors.

Ограничения: Lack of intelligent communication functions (such as RS485), и сертификация UL должна быть подтверждена для рынка США..

Рекомендации по действию

1. Verify the accuracy of the model and confirm whether the current range matches the motor parameters.
2. If it needs to be used in the United States, give priority to models or brands with UL certification (например, квадрат D, Eaton).
3. Refer to the official CHINT manual during installation, or contact technical support to obtain the wiring diagram.

For further verification, you can obtain the detailed specification sheet of JD-8-2A-30A through CHINT’s Whatsapp: 0086-13811255435 or the technical support on the official website.

What are the protection functions of the motor protector JD-8-2A-30A?

According to the existing information and the typical characteristics of the CHINT JD-8 series motor protectors, the protection functions of JD-8-2A-30A mainly include the following core contents:

1. Basic Protection Functions (Mandatory)
2. Защита от перегрузки

Principle: By monitoring the motor current, when the current exceeds the rated setting current (within the range of 2A~30A), the inverse time-delay protection characteristic will be triggered (the larger the current, the shorter the action time, usually 4~60 seconds).

Функция: Prevent the motor winding from being burned out due to long-term overload.

2. Phase Loss (Open Phase) Protection

Principle: Real-time detection of the balance state of the three-phase current. When any phase of the power supply is missing or the voltage is abnormal (the three-phase unbalance degree > 50%), the power supply will be quickly cut off within 2 секунды.

Функция: Avoid the abnormal torque and temperature rise of the motor during the operation with a phase loss.

3. Overcurrent (Short Circuit) Protection

Principle: For sudden short-circuit or instantaneous large-current faults, the quick break protection (response time < 0.2 секунды) will be triggered.

Функция: Quickly cut off the circuit to prevent the motor and the line from being damaged by the short-circuit current.

1. Optional Extended Functions (Supported by Some Models, Specific Specifications Need to be Confirmed)
2. Undervoltage/Overvoltage Protection

Principle: Monitor the power supply voltage. Когда напряжение ниже, чем 70% номинальной стоимости (undervoltage) or higher than 130% (overvoltage), the delayed protection action will be triggered (usually 3~5 seconds).

Remarks: This function may need to be realized through the model suffix or the configuration module. It is recommended to consult the product manual for confirmation.

5. Locked Rotor Protection

Principle: Detect the sudden drop in the motor speed or the abnormal increase in torque (similar to overload but with a faster current surge), and trigger the time-limited protection (such as 1~10 seconds).

Remarks: Some advanced models have this function, and it may not be integrated in the basic models.

III. Summary of Protection Function Characteristics

1. Precautions for Use
2. Setting of the Setting Current: It is necessary to accurately set the current within the range of 2A~30A according to the rated current of the motor to avoid misoperation or failure of the protection.
3. Function Compatibility: If extended functions such as undervoltage/overvoltage are not clearly indicated in the model, it may be necessary to use external modules to achieve them. It is recommended to contact the manufacturer for confirmation.
4. Certification Adaptation: If it needs to be used in a specific region (such as the United States), it is necessary to confirm whether the protection functions comply with the local safety standards (such as the UL certification requirements).

The core protection functions of JD-8-2A-30A are overload, phase loss, and overcurrent protection, which can meet the basic fault protection needs of small and medium-sized three-phase motors. The extended functions (such as undervoltage and locked rotor protection) should be subject to the specific product manual or the information provided by the manufacturer. It is recommended to obtain detailed technical parameters through the official CHINT channels before installation to ensure that the functions match the characteristics of the motor load.