Chint Contactor NXC18-380V

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

1. Core Technical Parameters
2. 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.

1. Mechanical and Environmental Characteristics
2. 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.

1. 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.

1. Installation and Maintenance Key Points
2. 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.

1. 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.