Chint Contactor NXC18-380V

 The Chint Contactor NXC18-380V belongs to the Kunlun Series AC contactors, specifically designed for industrial control applications.

 I. Core Technical Parameters

 1. Main Circuit Parameters

- **Rated Operating Current**: 18A (under AC-3 utilization category, corresponding to 380V/400V main circuit voltage).  

- **Rated Insulation Voltage**: 690V, capable of adapting to voltage fluctuations in complex industrial environments.  

- **Pole Configuration**: 3-pole normally open (NO) main contacts, supporting three-phase motor control.  

- **Breaking Capacity**: Rated making current is 180A (10×Ie), and breaking current is 144A (8×Ie), meeting the requirements of frequent starting and stopping.

2. Control Circuit Parameters

- **Coil Voltage**: 380V AC (50Hz), directly compatible with industrial standard control voltages.  

- **Power Consumption Characteristics**: Pull-in power consumption is approximately 40-60VA, and holding power consumption is only 2-7VA, featuring significant energy-saving effects.  

- **Operating Range**: Pull-in voltage ranges from 70% to 120% of the rated value, and release voltage ranges from 20% to 70% of the rated value, ensuring reliable triggering.

3. Auxiliary Contact Configuration

- **Built-in Contacts**: 1 normally open (NO) + 1 normally closed (NC) auxiliary contact, enabling extended control logic.  

- **Contact Capacity**: The rated current of auxiliary contacts is 5A, supporting signal feedback or interlock control.

 II. Mechanical and Environmental Characteristics

1. Structural Design

- **Mounting Method**: Supports 35mm DIN rail clipping or screw fixing, compatible with standardized control cabinet layouts.  

- **Dimensions and Weight**: Compact design with dimensions of 88mm×45mm×75mm and a weight of 367g, saving space and facilitating maintenance.  

- **Protection Class**: IP20 (protects against intrusion of solid foreign objects larger than 12mm), suitable for conventional industrial environments.

 2. Environmental Adaptability

- **Operating Temperature**: -5℃~+40℃ (long-term), with extreme temperature resistance of -35℃~+70℃, adapting to wide-temperature environments.  

- **Altitude Requirement**: ≤2000 meters, meeting the needs of most industrial sites.  

- **Vibration and Shock Resistance**: The inclination of the mounting surface is ≤±5°, allowing stable operation in scenarios without significant vibration.

 III. Application Scenarios and Supporting Solutions

1. Typical Applications

- **Motor Control**: Directly controls 7.5kW three-phase asynchronous motors (under AC-3 category), compatible with fan and pump loads.  

- **Automation Systems**: Used for production line start-stop control and sequential logic interlocking, supporting PLC integration.  

- **Power Distribution Systems**: Combined with thermal overload relays (e.g., NR2 Series) to form electromagnetic starters, providing overload protection.

2. Selection and Matching

- **Fuse Matching**: NT00-20 type fuses (gG20) are recommended for short-circuit protection.  

- **Thermal Overload Relay Model**: NR2-25/Z, with a rated current adjustment range of 12-18A, accurately matching load characteristics.

 IV. Certifications and Reliability

- **International Certifications**: Certified by CCC and CE, compliant with GB/T 14048.4/IEC 60947-4-1 standards, applicable for export projects.  

- **Service Life Indicators**: Mechanical life of 12 million operations, electrical life of 1.2 million operations (under AC-3), meeting the requirements of long-term high-load operation.  

- **Material and Technology**: Silver alloy contacts have strong arc resistance, and the enhanced spring mechanism ensures rapid contact breaking, reducing the risk of welding.

 V. Installation and Maintenance Key Points

 1. Wiring Specifications

- **Main Circuit**: Supports 1.5-6mm² solid wires or 1-4mm² flexible wires, fastened with M3.5 screws (tightening torque: 0.8N·m).  

- **Control Circuit**: 1-2.5mm² wires are connected to A1/A2 terminals; shielded wires are recommended for anti-interference.

. Commissioning Recommendations

- **Pull-in Test**: Measure the coil resistance before power-on (approximately 1.2kΩ for the 380V specification) to verify coil integrity.  

- **Contact Inspection**: Regularly clean the oxide layer on the contact surface to ensure the contact resistance is ≤50mΩ.

 VI. Alternative Solutions and Upgrade Paths

For function expansion, the following upgrade solutions can be considered:

- **NXC-22 (22A)**: Enhanced current capacity, suitable for 11kW motor control.  

- **NXC-25 (25A)**: Supports DC coil versions, compatible with DC control power supply systems.  

- **Intelligent Contactors**: For example, NXC-18 paired with the iMCC control module, enabling remote monitoring and energy management.

 VII. Typical Application Case

In a certain food processing production line, the NXC18-380V is used to control the conveyor belt motor:

- **Control Logic**: PLC sends signals to drive the contactor to realize motor forward and reverse switching.  

- **Protection Mechanism**: Combined with the NR2 thermal overload relay, when the motor current exceeds 18A due to stalling, the power supply is cut off within 0.5 seconds.  

- **Reliability Performance**: It has operated continuously for 18 months without faults, with contact wear less than 0.1mm and the maintenance cycle extended by 30%.

 VIII. Procurement and Compatibility Recommendations

- **Channel Selection**: Purchase through Chint-authorized distributors (WhatsApp: 0086-13811255435) to ensure the products are accompanied by CCC certification and original factory quality assurance.  

- **Compatibility Verification**: Before installation, check that the coil voltage (380V AC) matches the control cabinet power supply to avoid misoperation caused by voltage deviation.

With its high cost-effectiveness and stable performance, the NXC18-380V has become the preferred solution for small and medium-sized motor control, especially suitable for industrial scenarios requiring frequent starting/stopping and high reliability. When selecting the product, it is necessary to consider load characteristics and environmental conditions; if necessary, consult Chint technical support to obtain customized solutions.