Chint CJX2-9511 AC Contactor

Core Positioning: The Chint CJX2-9511 is a 3-pole Contacteur CA with a rated current of 95A, equipped with 1 normalement ouvert (NON) + 1 normalement fermé (Caroline du Nord) contact auxiliaire. It is suitable for AC 50/60Hz circuits, mainly used for remote switching on/off of circuits, frequent starting and control of three-phase AC motors. It can be combined with a thermal overload relay to form an electromagnetic starter for overload protection.

Interprétation du modèle

Model Segment	Signification
CJX2	Chint AC contactor series code (equivalent and compatible with Schneider LC1D series)
95	Rated operating current of 95A (under AC-3 utilization category at 400V)
11	Configuration des contacts auxiliaires: 1 Normalement ouvert (NON) + 1 Normalement fermé (Caroline du Nord)

Paramètres techniques de base

Élément de paramètre	Specification Details
Contactor Type	AC coil contactor, 3-pole main contacts + 1NON + 1NC auxiliary contacts
Tension de fonctionnement nominale	Circuit principal: AC 50/60Hz, up to 690V
Courant de fonctionnement nominal	95A at AC-3, 400V; 132A at AC-1, 400V
Coil Voltage Options	AC 24V/36V/110V/220V/380V, compatible with 50/60Hz
Coil Power Consumption	Pull-in power approx. 1800Virginie, holding power approx. 180Virginie
Tension d'isolation nominale	800V (complies with IEC 60947-4-1 standard)
Tension de tenue aux impulsions nominale	8kV
Durée de vie mécanique	Environ 10 millions d'opérations
Durée de vie électrique	Environ 1 million operations at AC-3, 400V, 95UN
Rated Operating Frequency	Jusqu'à 1200 operations per hour (AC-3 utilization category)
Control Circuit Voltage	Coil voltage range: 85%~110% of rated voltage
Méthode de montage	DIN rail mounting (35mm standard rail) or screw fixing
Méthode de câblage	Double-hole terminal blocks, main circuit applicable wire cross-section: 16~35mm²
Température de fonctionnement	-5°C ~ +40°C (can reach +40°C when relative humidity ≤50%, derating required at higher humidity)
Classe de protection	IP20 (protects against finger contact and solid foreign objects with diameter ≥12mm)
Poids	Approximately 1.2kg

III. Caractéristiques fonctionnelles

High Compatibility Design: Same dimensions as Schneider LC1D series, directly interchangeable, compatible with various functional accessories
High-efficiency Energy-saving Coil: Adopts high-quality electromagnetic materials, pull-in/holding power ratio up to 10:1, with significant energy-saving effect
Plusieurs mécanismes de protection:

Built-in overvoltage suppressor in the coil to extend coil service life

Main contacts made of silver alloy material, résistant à l'arc et anti-soudure, improving reliability

Dust cover design, adapté aux environnements industriels difficiles

Flexible Wiring System: Double-hole terminal block design, more secure wiring, reducing loosening risk
Large adaptabilité de tension: Wide coil voltage range (85%~110%), adapting to power grid fluctuations
Easy Installation: Standard DIN rail mounting, space-saving and convenient for quick replacement
Champ d'application

The CJX2-9511 contactor is suitable for the following industrial scenarios:

Contrôle du moteur:

Direct start/stop control of three-phase asynchronous motors (approx. 45kW at 380V)

Control of continuous operation equipment such as fans, water pumps and compressors

Control of frequent starting equipment such as conveyors and mixers

Electrical Control Systems:

Remote switching on/off of circuits in power distribution systems

Control of electric heating equipment and lighting systems

Combined with thermal overload relays (par ex., NR2 series) to form electromagnetic starters for overload protection

Automatisation industrielle:

Executive component of PLC control systems

Bypass contactor for soft starters and frequency converters

Electrical control of machine tools, printing machinery and packaging equipment

Recommandations de sélection

5.1 Key Selection Points

Selection Factor	Recommended Considerations
Type de charge	Select AC-3 rated current for motor loads; select AC-1 rated current for resistive loads
Correspondance de puissance	Can control ≤45kW three-phase asynchronous motors at 380V (AC-3)
Tension de bobine	Select according to control circuit power supply (220V/380V commonly used, 24V/36V/110V optional for special occasions)
Contacts auxiliaires	1NO+1NC meets basic control needs; auxiliary contact modules can be added for more contacts
Fréquence de fonctionnement	For frequent operation (>600 times/hour), derating is recommended or special high-frequency contactors should be selected
Conditions environnementales	For high-temperature, humid and dusty environments, derating or protection class upgrade should be considered

5.2 Modèles alternatifs et compatibilité

Alternative Model	Marque	Difference Description	Compatibilité
NXC-9511	Chint (Kunlun Series)	Upgraded version of CJX2 series with improved performance and compatible dimensions	Entièrement compatible, can be directly replaced
LC1D9511	Schneider	Original design with consistent performance	Installation and electrically compatible, interchangeable
TGC1-9511	Tengen	Same specification product with more competitive price	Installation compatible, consistent functions
CJX2-9501/9510	Chint	Different auxiliary contact configurations (01: 1Caroline du Nord; 10: 1NON)	Consistent main circuit parameters, different auxiliary contacts

5.3 Recommended Supporting Products

Relais de surcharge thermique: NR2-93 (setting current 63~93A), directly pluggable with CJX2-9511 to form an electromagnetic starter
Protection contre les surcharges: Motor protectors (par ex., JD-5) can be optionally configured for more comprehensive protection
Auxiliary Contact Expansion: Auxiliary contact modules such as F4-11 and F4-22 to increase the number of contacts
Surge Suppression: RC snubber or varistor to protect coils and contacts
Troubleshooting Guide

6.1 Défauts courants et solutions

Phénomène de défaut	Causes possibles	Étapes de dépannage
Contactor fails to pull in	1. Coil not powered; 2. Low coil voltage; 3. Burned coil; 4. Mechanical jamming	1. Check control circuit power supply and wiring; 2. Measure coil voltage (should be ≥85% of rated value); 3. Measure coil resistance with multimeter (normal value approx. several hundred ohms); 4. Check if iron core is jammed and remove foreign objects
Loud noise after pull-in	1. Oil/dust on iron core end face; 2. Broken shading coil; 3. Low coil voltage	1. Clean iron core end face; 2. Check shading coil (replace iron core if broken); 3. Adjust coil voltage to rated range
Contact overheating/ablation	1. Overload operation; 2. Poor contact connection; 3. Arc suppression failure	1. Check load current and replace with contactor of larger capacity; 2. Clean contacts and replace if severely ablated; 3. Check arc chute and ensure it is intact
Poor auxiliary contact connection	1. Contact oxidation; 2. Spring fatigue; 3. Câblage lâche	1. Clean contacts; 2. Replace auxiliary contact module; 3. Tighten wiring terminals
Coil burnout	1. Excessively high voltage; 2. Frequent starting; 3. High ambient temperature	1. Check power supply voltage and install overvoltage protection; 2. Reduce starting frequency or select high-frequency contactor; 3. Improve ventilation and lower ambient temperature

6.2 Contactor Status Judgment

Article d'inspection	Normal Status	Abnormality Judgment
Coil Resistance	Approx. 300~800Ω (depending on coil voltage)	Resistance of 0 (court-circuit) or infinity (open circuit) is abnormal
Main Contact Voltage Drop	≤50mV when closed	Excessively high voltage drop indicates poor contact connection
Iron Core Pull-in	No obvious noise and slight vibration	Loud noise and obvious vibration are abnormal
Arc Chute	Intact without carbonization marks	Severe damage or carbonization requires replacement

VII. Installation and Maintenance Precautions

Pre-installation Preparation:

Confirm that the model matches the load (actuel, tension, contacts auxiliaires)

Check for no external damage and complete accessories (arc chute, mounting bracket)

Select appropriate installation location (bien ventilé, loin des sources de chaleur et des sources de vibrations)

Spécifications d'installation:

Install after power cut, live operation is strictly prohibited

Standard DIN rail mounting (35mm), fix firmly

Main circuit wiring: wire cross-section 16~35mm², double-hole wiring to ensure firm connection

Control circuit wiring: wire cross-section 0.75~1.5mm², avoid laying in the same slot as main circuit

Installation direction: vertical installation (iron core upward), tilt ≤5°

Points clés de l'entretien:

Regular inspection (recommended once a month):

Contact status (presence of ablation and oxidation)

Coil temperature (should not exceed ambient temperature +40°C)

Wiring terminals (presence of loosening and overheating)

Arc chute (presence of damage and carbonization)

Cleaning: Remove dust with dry brush, solvent use is prohibited

Lubrication: Oil application is prohibited on iron core end face, keep clean and dry

Replacement Cycle:

Durée de vie mécanique: approx. 10 millions d'opérations, replacement is recommended after reaching the limit

Durée de vie électrique: approx. 1 millions d'opérations (AC-3), replacement cycle should be shortened for frequent starting

VIII. Résumé

The Chint CJX2-9511 contactor is an industrial-grade contactor with high cost performance and high compatibility. With its 95A rated current and 1NO+1NC auxiliary contact configuration, it is widely used in the control of three-phase motors below 45kW and electrical systems. During selection, comprehensive consideration should be given to factors such as load type, power and coil voltage. Installation and maintenance must strictly follow specifications to ensure safe and reliable operation. Compared with the Kunlun series NXC-9511, the CJX2-9511 has a more competitive price; compared with the Schneider LC1D9511, it has higher cost performance, making it an ideal choice in the field of industrial automation.