The Chint NM8-1000A circuit breaker

The Chint NM8-1000A circuit breaker is one of the NM8 series plastic case circuit breakers.

- **Product Features**

    - **High Breaking Capacity**: Adopting advanced current limiting principles and manufacturing technologies, it can quickly cut off the current in case of faults such as short circuits. It has a high breaking capacity, effectively protecting the safety of the circuits and equipment.

    - **Zero Arcing Design**: When breaking the circuit, there will be no arcing phenomenon, reducing the safety threats to surrounding equipment and personnel, and improving the safety and reliability of use.

    - **Small and Compact**: With a compact structural design, it has a small volume, takes up less space, is easy to install and use, and is suitable for electrical installation places with limited space.

    - **Modular Design**: It can be conveniently combined with other functional modules, such as the residual current protection module, etc., to meet different application requirements.

    - **Green and Environmentally Friendly**: It complies with relevant environmental protection standards, pays attention to environmental performance in material selection and manufacturing processes, and reduces the impact on the environment.

- **Working Principle**

    - **Overload Protection**: When there is an overload current in the circuit, the increased current causes the thermal element of the thermal release to heat up. The bimetallic strip deforms to a certain extent and pushes the mechanism to act, making the circuit breaker trip and cut off the circuit, thus protecting the circuits and equipment from overload damage.

    - **Short Circuit Protection**: When a short circuit fault occurs, the magnetic field generated by the large current overcomes the counterforce spring, and the release pulls the operating mechanism to act. The switch trips instantaneously, quickly cutting off the short-circuit current and preventing the expansion of the fault.

    - **Undervoltage Protection**: When the circuit voltage is lower than the set value, the armature of the undervoltage release is released, making the free release mechanism act. The circuit breaker trips and disconnects the circuit to protect the equipment from damage under undervoltage conditions.

- **Application Scenarios**

    - **Industrial Field**: Used in the power distribution systems of factories, providing overload, short circuit and undervoltage protection for various industrial equipment such as motors and production lines to ensure the stable operation of industrial production.

    - **Commercial Buildings**: Widely used in the electrical systems of commercial places such as shopping malls, office buildings and hotels to ensure the safe operation of electrical equipment such as lighting, air conditioners and elevators.

    - **Residential Buildings**: It can be used in the distribution boxes of residential buildings to protect household electrical appliances, prevent safety accidents such as electrical fires caused by overloads, short circuits and other faults, and ensure the safety of residents' electricity use.

    - **Other Fields**: It is also suitable for places that require reliable power supply and electrical protection, such as transportation, medical and health care, data centers, etc.

- **Technical Parameters**

    - **Rated Current**: The rated current of the NM8-1000A is 1000A, which can meet the circuit protection requirements of large current loads.

    - **Rated Voltage**: It is suitable for circuits with an alternating current of 50Hz and a rated voltage of 690V and below, and for direct current systems with a rated voltage of 500V and below.

    - **Ambient Air Temperature**: The upper limit of the ambient air temperature is +40°C, the lower limit is -5°C, and the average temperature within 24 hours does not exceed +35°C.

    - **Altitude**: The altitude of the installation site does not exceed 2000m.

    - **Atmospheric Conditions**: The relative humidity of the atmosphere does not exceed 50% when the ambient air temperature is +40°C. The average relative humidity of the wettest month is 90%, and the pollution degree is level 3.

- **Installation and Maintenance**

    - **Installation Method**: It can be installed vertically (upright installation), horizontally (horizontal installation), and also with the lower incoming line. The installation method is flexible and can be selected according to the actual installation environment and requirements.

    - **Regular Maintenance**: To ensure the normal operation and reliable performance of the circuit breaker, regular inspection and maintenance are required, including checking whether the appearance of the circuit breaker is damaged or deformed, whether the wiring terminals are loose, whether the operating mechanism is flexible, etc., and cleaning the dust and debris on the surface of the circuit breaker.

What is the applicable range of the Chint NM8-1000A circuit breaker?

The applicable range of the Chint NM8-1000A circuit breaker mainly covers aspects such as electrical system parameters, application scenarios and environmental conditions, as follows:

 I. Applicable Range of Electrical Systems

1. **Rated Current**

   It is suitable for current load circuits of **1000A and below**, and can meet the protection requirements of large current scenarios.

2. **Rated Voltage**

   - **AC System**: It is suitable for circuits with a frequency of 50Hz and a rated voltage of **690V and below**.

   - **DC System**: It is suitable for circuits with a rated voltage of **500V and below**.

3. **Protection Function**

   It has overload, short circuit and undervoltage protection functions, which can effectively ensure the safety of the circuits and equipment.

II. Application Scenarios

1. **Industrial Field**

   - Power distribution systems of factories, motor control, protection of production line equipment to ensure the stable operation of industrial equipment and prevent production interruptions caused by faults.

2. **Commercial Buildings**

   - Power distribution systems of places such as shopping malls, office buildings and hotels, protecting electrical facilities such as lighting, air conditioners, elevators and fire protection equipment, and ensuring the safe use of electricity in commercial places.

3. **Residential Buildings**

   - Residential distribution boxes and incoming circuits, providing overload and short circuit protection for household electrical appliances (such as kitchen appliances, air conditioners, water heaters, etc.) to reduce the risk of electrical fires.

4. **Other Fields**

   - **Transportation**: Such as the power distribution systems of railways, airports, etc.;

   - **Data Centers**: Ensuring the power safety of key loads such as servers and refrigeration equipment;

   - **Medical and Health Care**: The power distribution systems of hospitals to ensure the reliable operation of medical equipment;

   - **New Energy**: Circuit protection of systems such as photovoltaics and energy storage (specific voltage/current parameters need to be considered).

 III. Applicable Range of Environmental Conditions

1. **Temperature**

   - Ambient air temperature: The upper limit is **+40°C**, the lower limit is **-5°C**, and the average temperature within 24 hours does not exceed **+35°C**.

2. **Altitude**

   - The altitude of the installation site does not exceed **2000 meters**. In high-altitude areas, attention should be paid to derating the use (specific details need to refer to the product manual).

3. **Humidity and Pollution**

   - Relative humidity: It does not exceed 50% at +40°C, and the average humidity of the wet month is 90% (without condensation);

   - Pollution degree: It is suitable for **level 3 pollution environments** (there is conductive pollution or expected condensation).

 IV. Installation and Adaptability

- **Installation Method**: It supports vertical (upright installation), horizontal (horizontal installation) and lower incoming line installation, and is suitable for distribution boxes or switchgears with different spatial layouts.

- **Modular Expansion**: It can be combined with functional modules such as the residual current protection module, shunt release, undervoltage release, etc., to meet personalized protection requirements.

Summary

The Chint NM8-1000A circuit breaker is suitable for circuits with an **alternating current of 690V/ direct current of 500V and below, and a current of 1000A and below**. It is widely used in industrial, commercial, residential and special fields (such as data centers, transportation, medical care). It has the ability to operate stably under a wide range of temperature, altitude and humidity conditions, and is an ideal protection device for medium and large power distribution systems.