Withdrawable Vacuum Contactor 3p MCGR-12

Solutions

 

Solutions and Applications of High-Voltage Vacuum Contactors:

1. Motor Control Centers (MCCs): Vacuum contactors are commonly used in motor control centers to control electric motors’ operations, ensuring they start/stop safely and efficiently.
2. Transformer Switching: Vacuum contactors can be used for switching operations in transformers, ensuring they can be safely isolated or connected to a circuit.
3. Power Distribution Systems: In distribution systems, they play a role in load-breaking operations, especially during fault conditions or routine switching operations.
4. Capacitor Switching: Used in the reactive power compensation systems, they help switch capacitors in or out to ensure power quality in the system.
5. Pumps and Compressors: For large industrial pumps and compressors, vacuum contactors offer a reliable solution for motor control, ensuring that these devices operate safely.
6. Mining Operations: Given their robust and reliable nature, vacuum contactors find applications in the demanding environment of mining operations for controlling and protecting heavy machinery.
7. Renewable Energy Systems: As renewable energy systems like solar and wind become more prevalent, vacuum contactors help in integrating these energy sources into the grid, ensuring they can be connected or disconnected safely.
8. Electric Furnaces: In metallurgical processes, electric furnaces require precise control. Vacuum contactors offer a solution for managing these high-power devices.

With the increasing demand for reliable electrical systems, especially in industries undergoing rapid electrification, the role of high-voltage vacuum contactors is set to grow. Innovations are continually being made to enhance their efficiency, reduce their size, and ensure they can handle even higher capacities.

High-voltage vacuum contactors are unsung heroes in modern electrical systems. Their ability to handle significant power in a compact, safe, and reliable manner makes them indispensable in various industrial and commercial applications. As electrical systems evolve and demand grows, the importance of these robust devices will only become more pronounced.

Dimensions of MCGR-12

MCGR-12 can be mounted in the switchgear to form F-C circuit, matched with integrate protection device. It is used for making and breaking the load of AC H.V. motors, transformers, and capacitors in the power-plants, industrial and mining establishments. It also has functions of over-load protection and short-circuit protection. This combined appliance can be used in tri-pahse power system of AC 50Hz.

Product structure

In the contactor-fuse combined appliance, fuse is upper and contactor is lower, both are installed on the trolley. Fuse is installed at the power-supply side of contactor. Fuse striker operating will drive the contactor electric open, and the closing circuit be cut off.

The trolley in-and-out adopts lead-screw feeding mechanism, which can realize closing-door operation. Interlocking function is complete, and the design is reasonable.

Operating principles

The load-bearing, making, and breaking of current are all realized by the vacuum interrupter. The operation mechanism is electromagnetism operation mechanism. For D type electromagnetic contactor, when the closing electromagnet being electrified, the electromagnet attracts armature to drive the driving board

rotated and on. At this moment, the keeping coil in the closing electromagnet is series-in closing circuit, the contactor kept at the on-position. The initial closing force is the sum of electromagnetic force and the self close force of the three vacuum interrupter. When opening, only need to cut off the closing circuit, the opening spring overcomes the vacuum interrupter self-close force to do work, to seperate the fixed and moving contacts of the interrupter, keep the distance as contact gaps.

For J type mechanical contactor, after closing, the locking depends on the mechanical lock; keep it at the on-position. When opening, electrify the opening electromagnet, release the lock, then the opening depends on the bounce of opening spring.

Contactor-fuse protection coordination principle

With capability of making, breaking and load-bearing rated current, the contactor is an perfect switch components for controlling load of high voltage motor, transformer, and other equipment. However, it does not have short-circuit protection ability. The H.V. Limiting-current fuse has function of fast limit

fusing when the big current short-circuit. It’s expected current-forearc time characteristic shows inverse time characteristic curve. When the contactor matching with fuse and the over-load, short-circuit protection action time controlled by the integrated protection relay, the expected current-forearc time characteristic curve is crossed with the over-load and short-circuit protection action time. The cross point of current is named connecting current. The fault current lower than the connecting current is broken by contactor, while higher than the connecting current broken by fuse.

The combined appliance trolley is matched with the KYN28 switchgear. The structure of switchgear should be designed according to the connecting dimension provided by the combined appliance manufacture. Pay attentions to the match of trolley primary moving contact and fixed contact in the switchgear, the allowable

deviation is not more than 2mm.

Please state the following when placing the order:

1. Title, model/specification of the product;
2. Rated voltage, rated current and rated control voltage;
3. Quantity of product and spare parts;
4. Other special requirements.

You can asking Data Sheet List before order by e-mail: power@mettz.com or mettzpower@gmail.com

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