Voltage Contactor CKG4 High Voltage Vacuum Contactor

CKG3-7.2kV 160A 250A 400A 630A AC High Voltage 3 Phase Vacuum Contactor PriceThe CKG3/4-7.2 series AC three-pole high voltage vacuum contactors are designed for 50Hz–60Hz power networks, with a rated voltage of 6.6kV or 7.2kV and a rated current up to 630A in the main circuit. These contactors are widely used for remote switching, frequent starting, and reliable control of AC motors in medium voltage systems.For enhanced protection and safe operation, the CKG3/4 vacuum contactors are often used in combination with fuses and protective relays, serving as a cost-effectiv...

Inquiry

E-mail：sales@vcbbreaker.com

WhatsApp：8613736779975

Detailed Description
Product Encyclopedia

CKG3-7.2kV 160A 250A 400A 630A AC High Voltage 3 Phase Vacuum Contactor Price

The CKG3/4-7.2 series AC three-pole High Voltage Vacuum Contactors are designed for 50Hz–60Hz power networks, with a rated voltage of 6.6kV or 7.2kV and a rated current up to 630A in the main circuit. These contactors are widely used for remote switching, frequent starting, and reliable control of AC motors in medium voltage systems.

For enhanced protection and Safe Operation, the CKG3/4 vacuum contactors are often used in combination with fuses and protective relays, serving as a cost-effective alternative to vacuum circuit breakers. Their compact design, stable performance, and long service life make them an ideal solution for motor control, transformer switching, and capacitor bank applications in modern power distribution networks.

Model	CKG-7.2/160	CKG-7.2/250	CKG-7.2/400	CKG-7.2/630
Rated Voltage (Main Electric Circuit)	7200 V	7200 V	7200 V	7200 V
Control Electric Circuit Voltage	220/110 V	220/110 V	220/110 V	220/110 V
Rated Current (A)	160	250	400	630
Main Contact Parameters
Contact Distance (mm)	3.5 ± 0.3	3.5 ± 0.3	3.5 ± 0.3	3.5 ± 0.3
Overtravel (mm)	2 ± 0.2	2 ± 0.2	2 ± 0.2	2 ± 0.2
Contact Pressure	>85 N	>85 N	>85 N	>85 N
Power Frequency Withstand Voltage (RMS)
Main Electric Circuit	32000 V	32000 V	32000 V	32000 V
Auxiliary Circuit	2500 V	2500 V	2500 V	2500 V
Control Electric Circuit	2000 V	2000 V	2000 V	2000 V

Model	Making Capacity	Breaking Capacity	Breaking Current (kA)	Electric Lifetime (Operations)	Mechanical Lifetime (Operations)	Weight (kg)
	10 Ie, 100 times	8 Ie, 25 times		AC-3: 60×10⁴ AC-4: 6×10⁴	100×10⁴
CKG-7.2/160	10 Ie, 100 times	8 Ie, 25 times	4.5	AC-3: 60×10⁴ AC-4: 6×10⁴	100×10⁴	25.5
CKG-7.2/250	10 Ie, 100 times	8 Ie, 25 times	4.5	AC-3: 60×10⁴ AC-4: 6×10⁴	100×10⁴	25.5
CKG-7.2/400	10 Ie, 100 times	8 Ie, 25 times	6	AC-3: 60×10⁴ AC-4: 6×10⁴	100×10⁴	25.5
CKG-7.2/630	10 Ie, 100 times	8 Ie, 25 times	6	AC-3: 60×10⁴ AC-4: 6×10⁴	100×10⁴	36

Voltage Contactor CKG4 – High Voltage Vacuum Contactor for Reliable Medium-Voltage Control

Designed for demanding industrial and utility applications, the Voltage Contactor CKG4 High Voltage Vacuum Contactor operates seamlessly in 50/60Hz AC systems with a rated voltage of **7.2kV** and current ratings from **160A to 630A**. This three-pole vacuum contactor delivers exceptional performance in frequent switching scenarios—ideal for motor starting, transformer energizing, and capacitor bank control in modern medium-voltage distribution networks.

Equipped with high-integrity vacuum interrupters, the CKG4 series ensures arc-free interruption, minimal contact erosion, and long-term reliability—even under heavy-duty cycles. With a mechanical life of **1 million operations** and an electrical life exceeding **600,000 cycles (AC-3)**, it offers a durable, low-maintenance solution that reduces downtime and operational costs.

7.2kV industrial motor starter – engineered for rapid, synchronized switching of high-inertia AC motors in mining, oil & gas, and water treatment plants
Medium-voltage vacuum load switch – combines compact design with robust dielectric strength (32kV RMS) for safe integration into metal-clad switchgear
Frequent-operation HV contactor – supports up to 10× rated making current and maintains stable contact pressure (>85 N) across its service life

Precision-tuned contact parameters—including a **3.5 ± 0.3 mm contact gap** and **2 ± 0.2 mm overtravel**—ensure consistent arc control and optimal closing force. The unit also features standardized control circuit voltages (110V/220V AC) and withstands power frequency voltages up to **32kV**, meeting international safety and insulation standards.

When integrated with fuses or protective relays, the CKG4 functions as a cost-efficient alternative to full vacuum circuit breakers—delivering targeted protection without compromising performance. Its rugged construction, proven reliability, and modular compatibility make it a preferred choice for engineers seeking scalable, future-ready medium-voltage control solutions.