Chint NA1 Series Universal Circuit Breaker

 The Chint NA1 series universal circuit breaker is an efficient and intelligent electrical protection device. The following will provide a detailed introduction from aspects such as its scope of application, structural features, and product functions:

1. **Scope of Application*YouTube：https://youtu.be/cf-N2MxApQw  *

    - **Voltage and Current**: It is suitable for alternating current at 50Hz, with a rated working voltage up to AC690V and a rated working current range of 200A - 6300A.

    - **Application Scenarios**: It is widely applicable to the power distribution systems in power stations, factories, mines (especially at 690V), modern high-rise buildings, and intelligent buildings. It also plays an important role in green energy projects such as wind power generation and solar power generation.

2. **Structural Features**

    - **Installation Types**: There are two types, drawer type and fixed type. The drawer type circuit breaker consists of two parts, the main body and the drawer base. The main body of the circuit breaker is inserted into the drawer base to form the drawer type, which is convenient for installation, maintenance, and inspection; the fixed type is composed by installing side plates on both sides of the main body.

    - **Three-dimensional Arrangement**: It adopts a three-dimensional arrangement form. The contact system, the left and right side plates of the instantaneous overcurrent release are all installed on an insulating plate, and the arc extinguishing system is installed on the upper part. The operating mechanism can be installed on the front or the right side.

    - **Compact Design**: The overall structure is compact and the volume is relatively small. The contact part is completely enclosed in an insulating frame, and each phase of the contact is separated by an insulating plate to form a small chamber to ensure safety. The intelligent release, manual and electric operating mechanisms are arranged in sequence in front of the contact system, forming their respective independent space modules, which is conducive to disassembly during maintenance and inspection.

3. **Product Functions**

    - **Protection Function**: It can effectively prevent common electrical faults such as overload, undervoltage, short circuit, and single-phase grounding, and protect the circuit and power equipment. The coil of the overcurrent release and the thermal element of the thermal release of the circuit breaker are connected in series with the main circuit, and the coil of the undervoltage release is connected in parallel with the power supply. When a short circuit or severe overload occurs in the circuit, the armature of the overcurrent release is attracted, causing the free release mechanism to act and the main contacts to disconnect the main circuit; when the circuit is overloaded, the thermal element of the thermal release heats up, causing the bimetallic strip to bend upwards and pushing the free release mechanism to act.

    - **Intelligent Control**: It has an intelligent protection function with accurate selective protection, which can improve the reliability of power supply and avoid unnecessary power outages. The intelligent controller is the core for realizing intelligent protection, which can monitor electrical parameters in real time and make corresponding protection actions.

    - **Accessory Expansion**: A complete set of accessories can expand functions to meet the needs for extended functions in different application scenarios. For example, the shunt release can be used for remote control. During normal operation, its coil is de-energized. When remote control is required, press the start button to energize the coil, and the armature drives the free release mechanism to act, causing the main contacts to disconnect.

4. **Operating Conditions**

    - **Ambient Temperature**: The ambient air temperature is -5°C ~ +40°C, and the average value within 24 hours does not exceed +35°C (except for special declarations). For special orders from users indicating low-temperature type products, the ambient air temperature is -40°C ~ +40°C; when the ambient temperature exceeds +40°C, it should be used with reduced capacity according to relevant clauses, and the maximum allowable ambient temperature is +65°C.

    - **Altitude**: The altitude of the installation site does not exceed 2000m. If it exceeds 2000m, it must be used with reduced capacity.

    - **Extreme Atmospheric Conditions**: The relative atmospheric humidity does not exceed 50% when the ambient air temperature is +40°C. At lower temperatures, a higher relative humidity is allowed. The average maximum relative humidity of the wettest month is 90%, and at the same time, the average maximum temperature of that month is +25°C, and the condensation on the surface of the product caused by temperature changes should be taken into account.

    - **Pollution Degree**: Level 3.

    - **Selectivity Category**: B.

    - **Installation Category**: The installation category of the circuit breaker is IV. When the rated working voltage of the main circuit is less than or equal to AC400V, the installation category of the auxiliary circuit, except that the coil of the undervoltage release and the primary coil of the power transformer used by the electronic release are the same as that of the circuit breaker, the rest are all III; when the rated working voltage of the main circuit is greater than AC400V and less than or equal to AC690V, the auxiliary circuit needs to be isolated from the main circuit by an isolation transformer with a capacity of ≥ 2kVA, and the highest working voltage of the control circuit is AC400V, and the installation category of the auxiliary circuit is all III.

5. **Compliance Standards**: GB/T 14048.2, IEC/EN 60947-2.