Chint Contactor NXC18-380V

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

1. Parametri tecnici fondamentali
2. Main Circuit Parameters

Rated Operating Current: 18UN (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) contatti principali, supporting three-phase motor control.

Capacità di interruzione: 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

Tensione della bobina: 380V e (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% A 120% of the rated value, and release voltage ranges from 20% A 70% of the rated value, ensuring reliable triggering.

3. Auxiliary Contact Configuration

Built-in Contacts: 1 normalmente aperto (NO) + 1 normalmente chiuso (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. Adattabilità ambientale

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. Applicazioni tipiche

Controllo motorio: 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 (per esempio., 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 standard, applicable for export projects.

Service Life Indicators: Mechanical life of 12 milioni di operazioni, electrical life of 1.2 milioni di operazioni (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. Punti chiave di installazione e manutenzione
2. Specifiche di cablaggio

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

Circuito di controllo: 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 (22UN): Enhanced current capacity, suitable for 11kW motor control.

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

Intelligent Contactors: Per esempio, 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 e) 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.