Precision Power Control & Medium-to-Low Voltage Portfolio
Explore our primary power equipment portfolio engineered for robust continuous duty across utility networks, high-density industrial plants, and commercial infrastructures.
CJX1 Series AC Contactors: Electromagnetic Design & Engineering Integrity
Engineered in compliance with IEC 60947-4-1 and GB/T 14048.4, the CJX1 series (equivalent to the international 3TF family) provides unmatched mechanical life and thermal stability in demanding inductive motor load operations.
Double-Break Bridge Contact Mechanism
The CJX1 architecture employs a heavy-duty straight-motion double-break contact configuration. By splitting the contact gap across two symmetric contact points, arc energy during AC-3 and AC-4 inductive breaking is rapidly divided, suppressing erosion on the high-grade AgSnO2 (Silver Tin Oxide) and AgCdO contact matrices.
De-Ionizing Grid Arc-Chute System
Each pole is housed inside an isolated, arc-resistant thermosetting moulding compound chamber equipped with slotted magnetic de-ionizing splitter plates. During high-current contact parting, electromagnetic forces push the plasma arc upward into the copper-plated steel grids, cooling and extinguishing the arc within 8 to 12 milliseconds.
Precision Laminated Magnetic Core
Magnetic armatures are stamped from low-hysteresis-loss cold-rolled silicon steel laminations with riveted copper shading coils. This tight electro-mechanical design delivers an optimal pull-in profile, eliminating chattering, mechanical hum, and coil burn-outs under system voltage fluctuations between 85% and 110% Us.
CJX1 Series Industrial Performance Matrix & Ratings
Engineered to serve as reliable drop-in replacements for classical 3TF installations while conforming to modernized electrical insulation and short-circuit withstand tolerances.
| Model Series | Rated Operational Current (Ie) AC-3 380V | Rated Power (Pe) AC-3 380V | Auxiliary Contacts (Standard) | Pick-up / Drop-out Voltage | Making / Breaking Capacity | Cross-Reference Standard |
|---|---|---|---|---|---|---|
| CJX1-9 / CJX1-12 | 9A / 12A | 4.0 kW / 5.5 kW | 1NO or 1NC | 85% - 110% Us / 20% - 75% Us | 10× Ie AC-3 / 8× Ie AC-3 | 3TF30 / 3TF31 |
| CJX1-16 / CJX1-25 | 16A / 25A | 7.5 kW / 11.0 kW | 1NO + 1NC | 85% - 110% Us / 20% - 75% Us | 10× Ie AC-3 / 8× Ie AC-3 | 3TF32 / 3TF33 |
| CJX1-32 / CJX1-45 | 32A / 45A | 15.0 kW / 22.0 kW | 2NO + 2NC | 85% - 110% Us / 20% - 75% Us | 10× Ie AC-3 / 8× Ie AC-3 | 3TF34 / 3TF35 |
| CJX1-63 / CJX1-95 | 63A / 95A | 30.0 kW / 45.0 kW | 2NO + 2NC | 85% - 110% Us / 20% - 75% Us | 10× Ie AC-3 / 8× Ie AC-3 | 3TF46 / 3TF47 |
| CJX1-140 / CJX1-205 | 140A / 205A | 75.0 kW / 110.0 kW | 2NO + 2NC (Expandable) | 85% - 110% Us / 20% - 75% Us | 10× Ie AC-3 / 8× Ie AC-3 | 3TF50 / 3TF51 |
| CJX1-300 / CJX1-475 | 300A / 475A | 160.0 kW / 250.0 kW | 4NO + 4NC Modular | 85% - 110% Us / 20% - 75% Us | 10× Ie AC-3 / 8× Ie AC-3 | 3TF53 / 3TF56 |
Localized Application Scenarios in Global Industry
From heavy aggregate crushing plants to centralized solar-inverter step-up substations, CJX1 contactors deliver uninterrupted switching endurance under harsh electrical and environmental profiles.
Metallurgical & Continuous Mining Machinery
In harsh mine dewatering pumps, ball mills, and blast furnace conveyors, high ambient dust and severe vibration induce premature contactor chatter. CJX1 series units are deployed inside GCS withdrawable switchgear panels and customized enclosures, utilizing reinforced spring dampeners and dust-sealed auxiliary contact blocks to prevent micro-disconnections.
Renewable Energy & Solar Step-Up Stations
Within utility-scale photovoltaic tracker drives, central inverter low-voltage inputs, and compact prefabricated substations (such as YB and landscape YBD types), CJX1 contactors perform frequent grid-synchronous disconnections. Their thermal capacity manages harmonic distortion and continuous high operating temperatures without contact welding.
Municipal Infrastructure & Water Treatment
CJX1 contactors operate inside automatic transfer switch (ATS) configurations, high-power water booster pump arrays, and wastewater blower aerators. Operating under AC-4 inching and plug-reversing duties, our optimized contact material reduces arc-erosion rates, guaranteeing smooth municipal facility uptime.
Supply Chain Mastery from the World's Electrical Capital
Operating from Yueqing, Zhejiang—the global epicenter of low- and medium-voltage electrical manufacturing—Mingri Electric leverages end-to-end industrial clustering to guarantee delivery speed and technical cost superiority.
Full Vertical Integration
From high-speed silver-contact cold heading, sheet metal stamping, and automated copper coil winding to injection moulding of thermosetting BMC bases, 92% of the component value chain is executed within a 15-kilometer radius.
Agile Lead-Time Compression
By keeping raw materials and standardized armature sub-assemblies continuously buffered, we reduce standard batch delivery timelines down to 10–14 days, compared to the industry average of 6–10 weeks among Western multinational OEMs.
Automated Quality Assurance
Every CJX1 unit undergoes automated computerized testing on end-of-line benches: pick-up/drop-out voltage thresholds, contact bounce duration, coil impedance, and multi-pole dielectric withstand voltage (2500V 50Hz/1min).
Cost-to-Value Leadership
By pairing automated multi-cavity tooling with local raw material sourcing (electrolytic copper, high-purity silver, electrical grade silicone steel), Mingri Electric delivers 30% to 45% lower total acquisition costs for panel builders and system integrators.
Technological Evolution: Smart, Solid-State Hybrid & Eco-Conscious Control
As modern power distribution converges toward automated smart grids and stringent environmental mandates, the CJX1 platform is systematically evolving beyond traditional electromechanical limitations.
Wide-Band Electronic Coils (AC/DC Universal)
Traditional copper-wound electromagnetic coils are prone to overheating during prolonged voltage sags. Our next-generation CJX1 roadmap integrates microcontroller-driven PWM (Pulse Width Modulation) electronic coil modules. This allows an ultra-wide control voltage spectrum (e.g., 48V–250V AC/DC), slashing coil holding power consumption by up to 75% and eliminating magnetic humming completely.
IoT Predictive Maintenance & Wear Sensing
Transitioning into Industry 4.0, contactors are outfitted with non-intrusive thermal micro-sensors and mechanical stroke monitors. These modules calculate real-time contact mass loss based on breaking current integrals (∫i²dt), sending predictive alerts via Modbus-RTU / IO-Link to switchgear monitoring units before catastrophic phase failure occurs.
Cadmium-Free & Halogen-Free Materials
In accordance with global RoHS and REACH directives, our metallurgists have phased out Silver Cadmium Oxide (AgCdO) in favor of advanced Silver Tin Oxide Indium Oxide (AgSnO2-In2O3) compounds. These provide superior anti-welding characteristics without releasing toxic heavy metal vapor during high-current short-circuit interruptions.
International Compliance, Testing & Engineering Support
Seamless integration for EPC contractors and panel builders worldwide. Our equipment guarantees full interoperability, accredited third-party certification, and lifetime documentation traceability.
Certified Testing & Accreditations
Mingri Electric’s manufacturing systems are ISO 9001, ISO 14001, and ISO 45001 certified. The CJX1 contactor line holds comprehensive CCC, CE, and CB certifications, fully conforming to IEC/EN 60947-4-1 standards. Type-test reports cover short-time withstand current (Icw), temperature rise limits, and conditional short-circuit coordination.
Comprehensive FAT / SAT Support
We welcome international third-party inspection agencies (SGS, TÜV, Bureau Veritas) for Factory Acceptance Testing (FAT). Remote high-definition video inspection protocols, coordinate measuring machine (CMM) dimensional reports, and batch material certification sheets are furnished prior to container dispatch.
Worldwide Technical Engineering Assistance
Our dedicated bilingual electrical engineering desk assists EPCs and panel manufacturers with Type-2 coordination calculations, circuit breaker cascaded protection schemes, mechanical interlock CAD models (STEP/DWG), and custom coil voltage adaptations for international projects.
Frequently Asked Questions: CJX1 & Switching Engineering
Technical insights, selection guidelines, and operational recommendations answered by our senior low-voltage switchgear specialists.
How does the CJX1 Series directly compare to the LC1D contactor line?
While the LC1D series is celebrated for compact dimensions and DIN-rail mounting in automated machinery, the CJX1 series (derived from the heavy-duty 3TF platform) utilizes a more massive magnetic core and larger internal arc-extinction chambers. This makes CJX1 far more resilient under AC-4 inching, frequent plugging, and harsh industrial environments where high transient switching surges occur.
Can CJX1 contactors achieve Type 2 Short-Circuit Coordination with MCCBs?
Yes. Under IEC 60947-4-1 guidelines, Type 2 coordination requires that after a short-circuit fault, the contactor and overload relay cause no danger to personnel or installations and remain fully functional without contact replacement. Our engineering team provides verified coordination tables matching CJX1 contactors with our SJKM3 MCCB series and dedicated fast-acting semiconductor fuses.
What is the difference between AgCdO and AgSnO2 contact materials in CJX1?
Silver Cadmium Oxide (AgCdO) has long been the traditional choice for contact durability due to its low contact resistance and steady arc-dispersal characteristics. However, Silver Tin Oxide (AgSnO2) provides higher resistance to arc-erosion and contact welding during high inrush currents (AC-3/AC-4), while completely meeting eco-friendly RoHS directives without hazardous heavy metals.
What coil operating voltages and frequencies are available for overseas grids?
We manufacture coils for global system voltages including 24V, 48V, 110V, 220V/230V, 380V/400V, and 415V/440V at both 50Hz and 60Hz. Additionally, universal AC/DC coils (e.g., 100–250V AC/DC) are available upon request for installations subject to volatile auxiliary control lines or DC-battery-backed control power supplies.
How are reversing contactor interlocks arranged for motor forward/reverse duty?
For motor reversing applications, two CJX1 contactors can be fitted with a mechanical interlock assembly mounted between their bodies. This physical mechanism physically prevents simultaneous armature pull-in even during severe mechanical shock, paired with electrical interlocks using cross-wired NC auxiliary contacts for complete system redundancy.
Can CJX1 contactors be integrated directly into withdrawable switchgear units?
Yes. The compact footprint and front-accessible auxiliary contacts of the CJX1 series make it ideal for withdrawable motor control center (MCC) buckets in GCS, MNS, and GCK switchgear panels. They allow rapid inspection and replacement without disassembling adjacent busbar feeds or control conduits.
Protection, Conversion & Complete Distribution Systems
Select from our field-tested medium and low voltage balance-of-plant solutions engineered to complement high-performance contactor installations.
