Delixi CJX2s-1210 AC Contactor

Product Overview

The Delixi CJX2s-1210 is a 3-pole AC contactor belonging to the Navigator Series, specially designed for motor control and protection. Adopting a new-generation technology platform, it is suitable for frequent operation scenarios under AC-3 duty (rated operating current of 12A at voltage below 400V), featuring high reliability, long service life and easy installation.

Model Explanation: CJX2s (series code) 12 (rated operating current 12A) 10 (1 normally open auxiliary contact, 0 normally closed auxiliary contacts)

Core Application: It is used for starting, stopping and reversing control of three-phase asynchronous motors in industrial automation control systems. It can be combined with JRS1Dsp series thermal overload relays to realize motor overload and phase failure protection.

Parámetros técnicos básicos (Especificaciones técnicas)

Categoría de parámetro	Detailed Specifications	Observaciones
Parámetros básicos
Número de polo	3 polos	Rated voltage of main circuit up to 690V
Corriente de funcionamiento nominal (Es decir)	12A (AC-3, 400V)	Conventional Heating Current (It): 25A
Tensión de funcionamiento nominal (Ue)	400V/690V	Complies with GB 14048.4 estándar
Configuración de contacto auxiliar	1NO (1 Normalmente abierto)	No built-in normally closed contacts, external expansion available
Parámetros de la bobina
Rated Control Voltage (Uc)	AC 220V/380V/24V/36V/110V/240V	Universal for 50/60Hz, DC coil customizable
Pick-up Voltage Range	70%-120% Uc	Adapts to grid voltage fluctuations for more stable operation
Drop-out Voltage Range	20%-75% Uc	Ensures reliable breaking
Consumo de energía de la bobina	Pick-up: aprox. 70Virginia; Holding: aprox. 7Virginia	Energy-saving design to reduce operating temperature rise
Performance Parameters
Tensión nominal de aislamiento (interfaz de usuario)	800V	Clearance and creepage distance meet insulation requirements
Rated Impulse Withstand Voltage (Uimp)	8kV	Strong surge resistance
Vida útil mecánica	≥ 10 millones de operaciones	Upgraded silver contact technology for excellent arc resistance
Electrical Service Life (AC-3, 400V, 12A)	≥ 1 millones de operaciones	60% longer service life than industry average for frequent operations
Rated Operating Frequency	1200 operations/hour	Suitable for frequent start-stop control scenarios
Duty	AC-3 (squirrel-cage motor starting)	Can be used for AC-1 (resistive load) and AC-4 (motor reversing) with derating
Environmental Parameters
Temperatura de funcionamiento	-25℃ ~ +55℃	Altitude ≤ 2000m, humedad ≤ 95% (sin condensación)
Clase de protección	IP20	Prevents finger contact with live parts; must be installed inside electrical cabinets
Installation Parameters
Método de montaje	Standard 35mm DIN rail mounting / screw fixing	Minimum spacing between contactors ≥ 50mm for heat dissipation
Dimensiones generales	Aprox.. 50mm × 80mm × 58mm	Peso: aprox. 320g
Terminal Blocks	Circuito principal: M4 screws; Auxiliary circuit: M3 screws	Main circuit wire cross-section: 1.5-4mm²; Auxiliary circuit wire cross-section: 0.5-1.5mm²

Structural Features and Advantages

3.1 Core Structural Innovations

Silver Alloy Contact System: Main contacts adopt large-size silver alloy materials, which are resistant to arc erosion, reduce contact resistance, decrease temperature rise and extend service life.

Optimized Arc Extinguishing System: Extended main contact barriers increase creepage distance and improve insulation strength. Optional transparent cover is available for dusty environments.

Modular Design: Contactos auxiliares, coils and arc extinguishing covers are independent components, facilitating maintenance and replacement, and the number of auxiliary contacts can be flexibly expanded.

3.2 Performance Advantages

Amplia adaptabilidad de voltaje: The coil pick-up voltage range of 70%-120% Uc makes it suitable for industrial sites with unstable voltage.

Low Power Consumption Design: The holding power consumption is only 1/10 of the pick-up power consumption, achieving significant energy-saving effect and reducing operating costs.

Perfect Compatibility: It seamlessly matches with JRS1Dsp series thermal overload relays with matching installation dimensions, forming a complete motor protection unit.

Application Scenarios and Selection Guide

4.1 Escenarios de aplicación típicos

Direct start and stop control of three-phase asynchronous motors (≤ 5.5kW, 400V)

Electrical control systems of general machinery such as fans, bombas de agua, compressors and conveyors

Power control circuits of industrial automation production lines, machine tools and packaging machinery

Control of non-inductive loads such as lighting and resistance furnaces (rated current can be increased to 25A under AC-1 duty)

4.2 Selection Key Points

Coincidencia de carga: Motor power ≤ 5.5kW (400V), rated current ≤ 12A; avoid overload operation.

Frecuencia de funcionamiento: For frequent start-stop (≥ 600 operations/hour), derating by 10%-20% is recommended.

Control Voltage: Select appropriate coil voltage according to the control system power supply (AC 220V is the most commonly used).

Protection Matching: Must be used with thermal overload relays (p.ej., JRS1Dsp-25) to achieve overload and phase failure protection.

Condiciones ambientales: Additional protective measures shall be taken in high-temperature, high-humidity and dusty environments, or products with higher protection classes shall be selected.

Installation and Maintenance Specifications

5.1 Pasos de instalación (Professional Operation Procedure)

Pre-installation Preparation

Check that the product model and specifications are consistent with the order, the appearance is intact and accessories are complete.

Verify that the coil voltage matches the control circuit power supply, and perform insulation test (500V megger, insulation resistance ≥ 10MΩ).

Ensure that the installation environment meets the requirements (temperature, humedad, no corrosive gas).

Installation Operation

Install on standard 35mm DIN rail or fix on flat metal plate with M4 screws.

Main circuit wiring: Connect three-phase power supplies L1, L2, L3 to the input terminals of the contactor main contacts, and connect the output terminals to the motor stator windings.

Control circuit wiring: Connect coil terminals A1 and A2 to the control power supply; auxiliary contacts are used for self-locking, interlocking or signal indication.

Terminal block tightening torque: Main circuit ≥ 2.5N·m, auxiliary circuit ≥ 1.2N·m to avoid heating caused by loose connections.

Notas de instalación

The spacing between contactors and between contactors and other components shall be ≥ 50mm to ensure good heat dissipation.

Install vertically (coil facing upwards); avoid horizontal or inverted installation which may affect performance.

It is recommended to connect a 2A fuse in series in the control circuit to protect the coil from overload damage.

5.2 Maintenance (Inspección periódica)

Maintenance Item	Inspection Cycle	Inspection Content	Treatment Measures
Visual Inspection	Once a month	Check for no cracks or deformation on the shell, no loose or overheated traces on terminal blocks	Tighten loose terminals and replace damaged parts
Contact Inspection	Once a quarter	Check for no severe ablation or oxidation on the surface of main contacts, and ensure flexible operation of auxiliary contacts	Slight ablation can be polished; replace contact components if severely damaged
Coil Inspection	Once every six months	Check for no overheating, discoloration or peculiar smell of the coil, insulation resistance ≥ 10MΩ	Replace aging or damaged coils
Arc Extinguishing System Inspection	Once a year	Check that the arc extinguishing cover is clean without scaling and damage	Clean the arc extinguishing cover and replace damaged parts

Safety Warning: Installation and maintenance must be performed by professional electricians. Live operation is strictly prohibited. Disconnect the upper-level power supply and verify no voltage before operation.

Common Fault Troubleshooting and Solutions

Fenómeno de falla	Posibles causas	Pasos para solucionar problemas	Soluciones
Contactor fails to pick up	1. No voltage on the coil	1. Measure the voltage at coil terminals A1/A2 to confirm normal control power supply	1. Repair open circuits in the control circuit
	2. Coil damage	2. Check coil resistance (aprox. several hundred ohms normally)	2. Replace the coil
	3. Mechanical jamming	3. Manually operate the mechanism to check flexibility	3. Clean and lubricate the mechanism, replace damaged parts
Loud buzzing/chattering noise after pick-up	1. Low power supply voltage (below 70% of rated coil voltage)	1. Measure the coil voltage to check if it is ≥ 70% Uc	1. Adjust the power supply voltage to the rated range
	2. Oil/dust on the iron core end faces leading to incomplete pick-up	2. Check the cleanliness of the iron core contact surfaces	2. Disconnect the power supply, disassemble the contactor, and clean the moving and static end faces of the iron core with alcohol to remove oil and dust
	3. Broken short-circuit ring of the iron core (unique to AC contactors)	3. Observe if there is obvious wear on the iron core	3. Replace the broken short-circuit ring (core disassembly required; core assembly replacement is recommended)
	4. Iron core jamming resulting in incomplete pick-up		4. Check the mechanical transmission components, remove foreign objects, and apply a small amount of lubricating grease
Severe contact ablation	1. Overload current exceeding the rated current of the contactor (12A)	1. Verify the load current against the rated current of the contactor	1. Replace with a contactor of larger capacity (p.ej., CJX2s-1810) in case of overload
	2. Excessively high operating frequency (over 1200 operations/hour)	2. Check if the actual operating frequency exceeds the specification	2. Reduce the operating frequency or select a special high-frequency contactor
	3. Mismatched load type (p.ej., AC-4 duty without derating)	3. Check if the arc extinguishing cover is damaged	3. Derate by 50% for AC-4 (motor reversing) escenarios; appropriately increase the current for non-inductive loads
	4. Damaged/missing arc extinguishing cover leading to ineffective arc extinguishing		4. Replace the damaged arc extinguishing cover and ensure proper installation
Coil overheating and burning with burnt smell	1. Excessively high coil voltage (over 120% of rated voltage)	1. Measure the coil voltage to check if it is ≤ 120% Uc	1. Replace with a coil of matching voltage and install a voltage stabilizer
	2. Continuous coil energization (defective control circuit design without power-off loop)	2. Check if there is self-locking failure in the control circuit	2. Optimize the control circuit by adding a power-off switch or time relay to avoid continuous coil energization
	3. Excessively high ambient temperature/insufficient installation spacing leading to poor heat dissipation	3. Check the ventilation condition of the installation environment	3. Ensure that the contactor installation spacing is ≥ 50mm and improve the ventilation condition of the electrical cabinet
	4. Iron core jamming causing continuous high-current coil pick-up		4. Troubleshoot the cause of mechanical jamming before putting it into use again

Accessories and Expansion Functions

7.1 Standard Accessories

35mm DIN rail mounting clips (standard configuration)

Transparent dust cover (optional, suitable for dusty environments)

Auxiliary contact expansion module (can add 1NO+1NC, model: F4-11)

7.2 Combined Applications

Combined with JRS1Dsp-25 thermal overload relay to realize motor overload, phase failure and locked-rotor protection

Cooperated with JZC4s contactor relay to expand the contact capacity of the control circuit

Can be equipped with a pneumatic time delay head (p.ej., ST4P) to realize time-delay control functions such as motor star-delta starting

Certifications and Quality Assurance

Certificaciones: CCC, CE, RoHS and other authoritative certifications; complies with GB 14048.4 y CEI 60947-4-1 estándares

Quality Assurance: Delixi Electric provides 18-month product warranty; free repair or replacement for non-human damage within the warranty period

Production Standards: Manufactured on automated production lines with 100% factory inspection to ensure product consistency and reliability

Ordering Information

Modelo	Voltaje de la bobina	Order Number Example	Observaciones
CJX2s-1210	CA 220 V	CJX2S1210M7	Universal for 50/60Hz, RoHS compliant
CJX2s-1210	CA 380V	CJX2S1210Q7	Suitable for industrial 380V control circuits
CJX2s-1210	AC 24V	CJX2S1210E	Safe voltage control, suitable for humid environments

Nota: For DC coil or special configurations, please contact Delixi Electric technical support for customization.

Common Faults and Solutions of Delixi CJX2s-1210 AC Contactor

Faults of the Delixi CJX2s-1210 contactor are mainly concentrated in three categories: electromagnetic system, contact system and mechanical structure. The following lists the causes and corresponding solutions classified by fault phenomena, considering both on-site quick troubleshooting and long-term maintenance requirements:

Fault Category	Fenómeno de falla	Common Causes	Soluciones
Electromagnetic System Faults	1. Contactor fails to pick up, no coil action	1. Control circuit power-off/fuse blown	1. Measure the voltage at coil terminals A1/A2 with a multimeter to confirm normal control power supply; replace the blown fuse
	2. Disconnects immediately after power-off (no self-locking)	2. Mismatched coil voltage and power supply voltage (p.ej., AC220V coil connected to 380V)	2. Verify the rated coil voltage (p.ej., CJX2s-1210M7 is AC220V) and replace with a matching coil
		3. Loose/oxidized coil terminal wiring	3. Apriete los bloques de terminales, polish the oxidized contacts with sandpaper and apply conductive paste
		4. Burnt coil (internal open circuit/short circuit)	4. Measure the coil resistance (normally several hundred ohms; replace the coil if open circuit/short circuit occurs)
		5. Poor contact of auxiliary contacts in the self-locking loop	5. Check the 1NO auxiliary contacts, clean the contact surfaces or replace the auxiliary contact module
	Loud buzzing/chattering noise from the iron core after pick-up	1. Low power supply voltage (below 70% of rated coil voltage)	1. Adjust the power supply voltage to the rated range (70%-120% Uc)
		2. Oil/dust on the iron core end faces leading to incomplete pick-up	2. Disconnect the power supply, disassemble the contactor, and clean the moving and static end faces of the iron core with alcohol to remove oil and dust
		3. Broken short-circuit ring of the iron core	3. Replace the broken short-circuit ring (core disassembly required; core assembly replacement is recommended)
			4. Check the mechanical transmission components, remove foreign objects, and apply a small amount of lubricating grease
	Coil overheating and burning with burnt smell	1. Excessively high coil voltage (over 120% of rated voltage)	1. Replace with a coil of matching voltage and install a voltage stabilizer
		2. Continuous coil energization (defective control circuit design without power-off loop)	2. Optimize the control circuit by adding a power-off switch or time relay to avoid continuous coil energization
		3. Excessively high ambient temperature/insufficient installation spacing leading to poor heat dissipation	3. Ensure that the contactor installation spacing is ≥ 50mm and improve the ventilation condition of the electrical cabinet
		4. Iron core jamming causing continuous high-current coil pick-up	4. Troubleshoot the cause of mechanical jamming before putting it into use again
Contact System Faults	Severe ablation of main contacts with blackening and arcing on the surface	1. Overload current exceeding the rated current of the contactor (12A)	1. Verify the load power (≤ 5.5kW at 400V); replace with a contactor of larger capacity (p.ej., CJX2s-1810) in case of overload
		2. Excessively high operating frequency (over 1200 operations/hour)	2. Reduce the operating frequency or select a special high-frequency contactor
		3. Mismatched load type (p.ej., AC-4 duty without derating)	3. Derate by 50% for AC-4 (motor reversing) escenarios; appropriately increase the current for non-inductive loads
		4. Damaged/missing arc extinguishing cover leading to ineffective arc extinguishing	4. Replace the damaged arc extinguishing cover and ensure proper installation
	Main contact welding (unable to disconnect after pick-up)	1. Load short circuit causing instantaneous high-current impact on contacts	1. Troubleshoot the load-side short-circuit fault (p.ej., motor winding short circuit), repair and replace the contactor
		2. Long-term contact ablation leading to excessive contact resistance and heating welding	2. Regularly inspect the contact status; slight ablation can be polished with fine sandpaper; replace contact components or the whole machine if severely damaged
		3. Excessively high voltage during contactor breaking leading to ineffective arc extinguishing	3. Install RC absorbers or surge suppressors when breaking inductive loads
	Auxiliary contact failure (self-locking/signal circuit disconnection)	1. Oxidized/dusty auxiliary contacts leading to poor contact	1. Clean the surfaces of auxiliary contacts or replace the auxiliary contact module (F4-11 module can be expanded)
		2. Auxiliary contact current overload (exceeding the rated current of 5A)	2. Auxiliary contacts are only used for control circuits; avoid directly carrying high-power loads
		3. Loose contact wiring	3. Tighten the M3 terminal blocks with torque ≥ 1.2N·m
Mechanical Structure Faults	Sticking or unsmooth pick-up/disconnection action of the contactor	1. Dust or foreign objects entering the shell and jamming the transmission mechanism	1. Disconnect the power supply, disassemble the contactor, clean internal foreign objects and keep the mechanism clean
		2. Fatigue or breakage of the moving iron core return spring	2. Replace the fatigued or broken return spring
		3. Inclined installation of the contactor leading to uneven stress on the iron core	3. Ensure vertical installation of the contactor (coil facing upwards) with flat rail or screw mounting
	Slow reset of moving contacts after contactor disconnection	1. Insufficient elasticity of the return spring	1. Replace the return spring
		2. Oil adhesion on the iron core end faces causing magnetic hysteresis	2. Clean the iron core end faces to remove oil
		3. Failure of the contact pressure spring	3. Adjust or replace the contact pressure spring

General On-site Troubleshooting Steps (Safety First)

Power-off and Voltage Verification: Disconnect the upper-level power supply of the contactor before troubleshooting, and verify no voltage with a voltage tester to avoid electric shock.
Visual Inspection: Observe whether the contactor shell is damaged, el cableado está suelto, the contacts are ablated, and the coil is discolored.
Multimeter Testing:

Measure coil resistance: Determine if the coil has an open circuit/short circuit.

Measure contact on-off status: Main contacts should be on when picked up and off when disconnected.

Mechanical Testing: Manually press the moving iron core to test the smoothness of pick-up/reset and determine if there is jamming.

Preventive Maintenance Recommendations

Regular Cleaning: Clean dust and oil inside the contactor once a quarter, focusing on the iron core end faces and contact surfaces.
Inspección de cableado: Tighten the terminal blocks once a month; the torque of main circuit M4 terminals is ≥ 2.5N·m, and that of auxiliary circuit M3 terminals is ≥ 1.2N·m.
Contact Maintenance: When the contact ablation area exceeds 1/3, replace the contact components or the whole machine in time to avoid fault expansion.
Environmental Protection: Install a transparent dust cover in dusty and humid environments, or select products with higher protection classes.