CKJ20-160/250/400 Low Voltage Vacuum Contactor | Reliable 400V-1.6kV Power Switching | Chennuo Electric-Chennuo Electric Technology Group Co., Ltd

CKJ20-160/250/400 low voltage vacuum contactor switch

CKJ20-160/250/400 low voltage vacuum contactor

CKJ20-160/250/400 Low Voltage Vacuum Contactor Switch

This CKJ20 series of vacuum contactor switch is suitable for alternating current (AC) at 50-60 Hz, with a main circuit rated voltage below 1.6 kV, and rated currents ranging from 160 A, 250 A, 400 A, 630 A, 800 A, 1000 A, to 1250 A. They are designed for long-distance switching and breaking, as well as for frequent starting and controlling of AC motors, transformers, and capacitor banks. The series includes permanent magnet holding and electrically holding two types, with a fully enclosed design that is aesthetically pleasing and cost-effective. CKJ20 and CJ20 can be replaced with each other with a good installation dimensions, offering easy control, more stable and reliable performance, and a long maintenance-free service life. This makes it an ideal replacement for old AC contactors. Additionally, the series includes permanent magnet vacuum contactors, which feature mechanical holding with zero secondary control power consumption, making them an excellent energy-saving control switch. They are suitable for applications with infrequent operations and where mechanical holding in the closed state is required.

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Parameter

Tech. parameters	Model	160、250、400/1.14~1.6KV	630、800/1.14~1.6KV	1000、1250/1.14~1.6KV
Rated voltage of the main circuit	(V)	1140~1600	1140~160C	1140~1600
Rated current of the main circuit	(A)	160、250、400	630、800	1000、1250
Main circuit making capacity	(A/100 times)	1600、2500、4000	6300	8000、10000
Main circuit switching capability	(A/10 times)	4000	5000	6000、8000
Ultimate breaking capacity	(A/3 times)	5000	6300	8000、10000
Electrical endurance AC3	(10,000 times)	30	30	30
Mechanical life	(10,000 times)	100	100	100
Rated operating frequency AC3	( times/h)	300	300	300
Clearance between open contacts	(mm	2±0.2	2±0.2	2±0.2
Overtravel	(mm)	1.0±0.2	1.0±0.2	1.0±0.2
Secondary control voltage	(V)	ACorDC:36/110/220/380or customized

Normal operating and installation conditions for the CKJ20 AC low-voltage vacuum contactor:

Altitude not exceeding 2000 meters
Ambient temperature between -5°C and +40°C
24-hour average temperature not exceeding +35°C

Typical Applications of Low-Voltage AC Vacuum Contactors

Heavy-Duty AC Motor Control: Engineered for the frequent starting, stopping, reversing, and jogging (inching) of three-phase AC induction motors. They provide highly reliable control for high-inertia industrial machinery, including heavy-duty pumps, ventilation fans, compressors, and conveyors under severe AC-3 and AC-4 duty cycles.
Transformer Dynamic Switching: Essential for the safe, dependable, and frequent connection and disconnection of distribution transformers. Our vacuum contactors ensure transient-free, smooth switching and reliable isolation within low-voltage switchgear and power distribution units.
Capacitor Bank Switching (PFC): Crucial for automatic Power Factor Correction (PFC) and reactive power compensation systems. Specially designed to suppress high inrush currents during multi-stage capacitor switching, thereby protecting the network and improving overall grid efficiency.
Industrial Automation & Remote Operation: Functions as a core power switching component within Motor Control Centers (MCCs) and decentralized automation networks. They offer precision switching, extended electrical endurance, and seamless interface with PLCs and remote control systems.
Hazardous & Explosion-Proof Environments: Highly optimized for integration into flameproof and explosion-proof magnetic starters. The fully enclosed, zero-open-arcing vacuum interruption technology ensures ultimate operational safety in severe, volatile, or hazardous environments such as underground mining, petrochemical plants, and grain handling facilities.

Core Advantages of Chennuo Low-Voltage Vacuum Contactors

Extended Service Life & High Switching Frequency: Leveraging advanced vacuum interruption technology, contact wear is drastically minimized, ensuring millions of trouble-free operations. This exceptional mechanical and electrical endurance significantly reduces maintenance intervals and costly downtime in high-frequency, heavy-duty cycling applications.
Superior Safety & Advanced Arc Extinguishing: Electrical arcs are rapidly extinguished within the hermetically sealed vacuum interrupter, completely preventing external arc flashing. This guarantees ultimate protection for both personnel and downstream equipment, eliminating the hazards associated with open-air arcing.
Rugged Reliability & Harsh Environment Adaptability: Engineered with a robust structural design, our contactors deliver stable, high-performance reliability. The vacuum-sealed construction provides an inherent barrier against ambient dust, high humidity, and corrosive chemical agents, ensuring seamless operation in severe industrial environments.
Optimized Total Cost of Ownership (TCO): The synergy of a prolonged operational lifespan and virtually maintenance-free performance delivers a highly cost-effective switching solution. Our contactors optimize system efficiency, translating into substantial, long-term operational savings and maximum return on investment (ROI).

Why Choose Chennuo Low-Voltage Vacuum Contactors?

As a premier, engineering-driven vacuum contactor manufacturer, Chennuo Electric brings unmatched technical expertise to the low-voltage power distribution sector. Our unique manufacturing capabilities and customer-first approach set us apart in the global market:
Advanced & Certified Manufacturing: As a verified, direct-to-factory supplier, our professional engineering ensures that every low-voltage unit complies with rigorous international quality standards. We deliver heavy-duty reliability with specialized ratings of up to 2000V / 1250A for high-demand applications.
Uncompromising Quality & Rugged Durability: Tailored for the most demanding low-voltage industrial environments, our contactors exhibit outstanding physical and electrical durability. Our rigorous quality control framework guarantees stable, high-performance execution even during continuous, high-frequency switching operations.
Highly Flexible & Customized Engineering Solutions: We offer an extensive portfolio of low-voltage vacuum contactor configurations, spanning diverse rated voltages, current capacities, coil specifications, and pole configurations (e.g., 3-pole, 4-pole). Furthermore, our in-house R&D team provides tailormade OEM/ODM solutions to match your precise blueprints.
Long-Term Partnership & Comprehensive Technical Support: We offer end-to-end client support that goes far beyond the transaction. From initial technical consultation and drawing verification to responsive after-sales service, Chennuo ensures seamless project execution and absolute peace of mind.