Product Details

Compact medium voltage vacuum contactor

The EVC6-12kV and 7.2KV 400A series AC medium voltage vacuum contactor is a brand-new generation of products developed by our company in response to market demands, capable of fully meeting the latest requirements of the 10kV network. By summarizing years of user experience and combining the latest design concepts of our company, the product is aesthetically pleasing, reliable in performance, easy to use and maintain, and can completely replace imported products. It can be reliably used for switching capacitive loads, such as for making and breaking transformers (AC-6a) and capacitor banks (AC-6b).

Specification

Model	Unit	EVC6-12KV/400A	EVC6-7.2KV/400A
Rated Operating Voltage (Ur)	kV	12	7.2
Rated Insulation Level
1-min Power Frequency Withstand Voltage (Ud)	kV	42	32
Lightning Impulse Withstand Voltage (Peak) (Up)	kV	75	60
Rated Frequency (fr)	Hz	50	50
Rated Operating Current (Ie)	A	400	400
Rated Single Capacitor Bank Breaking Current (C2)	A	400	400
Rated Back-to-Back Capacitor Bank Breaking Current (C2)	A	—
Short-time Withstand Current
Rated Short-time Withstand Current (Ik)	A	6300	6300
Rated Peak Withstand Current (Ip)	kA	16	16
Rated Short-circuit Duration (tk)	s	4	4
Rated Operating Frequency
Electrical Endurance	operations/hour	600	600
Mechanical Endurance	operations/hour	300	300
Rated Load and Overload Characteristics
100 Times Closing Operations (Category AC4)	A	6300	6300
25 Times Opening Operations (Category AC4)	A	5040	5040
Rated Withstand Overload Current for 1s	A	9450	9450
Rated Withstand Overload Current for 30s	A	3780	3780
Main Circuit Contact Resistance	μΩ	<200	<200
Electrical Endurance
AC3	10*10⁴ times	25	25
AC4	10*10⁴ times	6	6

Characteristics

Control and Auxiliary Circuits

Control power supply voltage Us: ac./dc. 110V, 220V, 380V, or customized according to user requirements.
Control power consumption: Electrical self-holding: starting <2000W, holding <100W. Mechanical self-holding: closing <2000W, opening <1000W.
Auxiliary contacts: Up to nine sets of normally open and normally closed contact combinations, five sets for mechanical holding.
Auxiliary contact capacity: AC380V 6A; AC220V 10A.
Power frequency withstand voltage: 2kV (excluding components).

Operating Characteristics

Closing and opening time ≤120ms.
Three-phase synchronism ≤2ms.
Minimum pick-up voltage ≤85%Us, maximum release voltage = 10%~75%Us.

Feature

Main Circuit

The vacuum switch tube uses products from well-known domestic manufacturers. The technology is mature, quality reliable, and has a good market reputation.
The main circuit base adopts an integrated molded frame structure, which has good rigidity, minimal deformation, high insulation strength, and good resistance to pollution.
The 630A current rating uses a double dynamic end connection with end surfaces and conductive clips, resulting in low resistance, low temperature rise, and greater reliability.
The conductive busbar is aesthetically pleasing, durable, and provides a reliable connection, making it convenient for users.

Electromagnetic System

Optional permanent magnet mechanism or traditional electromagnetic mechanism.
Uses a quick-action, high-capacity sealed auxiliary switch, greatly enhancing the reliability of the auxiliary switch and ensuring safe operation.
The optimized action structure reduces coil start-up power and holding power, resulting in low temperature rise, extended lifespan, and increased reliability.

Operating Structure

The main shaft uses self-aligning bearings for flexible support without jamming or axial play, improving operational performance and consistency.
The moving end uses a secondary guiding mechanism to ensure the axial movement coaxiality of the vacuum tube's moving conductive rod. A reasonable operating mechanism enhances the contactor's performance and reliability. This ensures three-phase synchronism and bounce characteristics superior to similar products.
Enhanced main contact pressure improves electrical performance and operational characteristics, outperforming similar products.
The mechanical holding device is integrated, with a reasonable structure for more reliable use.

Ease of Use and Maintenance

The product body can be installed horizontally or suspended, with mounting holes designed for easy suspension.
The control circuit connection terminals use universal rail-mounted terminal blocks (plug-in terminal blocks can also be installed according to customer needs), with functional markings to prevent incorrect wiring and facilitate connection. The number of auxiliary contacts can be combined according to user requirements.

Secondary wiring schematic