EUNSUNG Engineering

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Motor Control Center

Using the latest technology, the motor control center (MCC) with the rotary pressure contact structure provides upgraded and highly reliable products.

High reliability motor control center

The rotary pressure contact and the vertical bus in the MCC unit are created in an all-in-one arc free zone to improve the reliability of the composition system

  • Rotary pressure contact module
  • Rotary pressure contact module unit Combination of arc-free rotary pressure contact and vertical motion
  • The contact, vertical bus and power plug in the unit are sealed and encapsulated and create an arc-free zone
  • The vertical bus is completely insulated between phases and the phase to earth to reduce the internal arc risk
  • Changing the unit from the operation position to the test position does not affect the protection class of the switchgear
  • When changing from the operation or test position, there is no unit movement, and thus the power cable remains fixed (preventing any damage to the wires)
  • The contact area maintains good contact pressure as the electromagnetic force increases in the event high current is generated

All-in-one arc-free rotary pressure contact contains cutting-edge technology with zero defects

Arc-free vertical bus section
  • Vertical bus is completely insulated
  • All changes to the unit module are available even when the voltage is increased
  • "Automatic shutter" is mechanically interlocked, and additional pad-lock is available
Rotary pressure contact with no arc fault
  • Rotary pressure contact module forms an arc free zone with vertical bus and output plug insulators
Innovative pressure contact
  • Pressure contact within the module increases by the magnetic field for short circuits

Composition of pressure contact and motor control center

All-in-one arc-free rotary pressure contact module for pulling units

Rotary pressure contact (patent: 10-1825062) is connected to the arc-free power source

    • Separate operation and test positions
    • Main breaker only operates when the door is closed
    • Unit is pulled only in a separated position
    • Input and output are separated from power sources
    • Pulling unit and assembled item can be interchanged during operation
    • Matching unit interlock available (optional)
    • Color position indicator for pulling units

Vertical bus composition

  • Assembly of vertical bus insulation module
  • Combination of horizontal and vertical buses

Small capacity arc-free rotary pressure contact module for pulling units

    • Small capacity arc-free rotary pressure contact module for pulling units
    • Breaker only operates when the door is closed
    • Unit is pulled only in a separated position
    • Input and output are separated from power sources
    • Pulling unit and assembled item can be interchanged during operation
    • Color position indicator for pulling units
    • Matching unit interlock available (optional)

Rating and specifications

Field Details
Type Indoor use
Rated voltage A.C 460V
Insulation voltage A.C 1000V
Impulse withstand voltage 12kV
Main Busbar Number of Pole 3, 4
Rated current ~ 1250A
Rated short time current ~ 65kA
Peak current ~ 143kA
Main Busbar Number of Pole 3, 4
Rated current 630A
Rated short time current ~ 65kA
Peak current ~ 143kA
Protection degree External IP 4X
Internal IP 2X
외함Panel Frame 2.3mmt
Door/Cover 1.6mmt (Option 2.3mmt)
Top & Side plate 1.6mmt
Painting & Coating Painting Munsell No. 5Y 7/1
Coating Unit and internal components
Coating Main circuit KIV 4.0mm² or over (Other Option)
Control circuit KIV 1.5mm² (Other Option)
Form of degree Form 4b
External dimension Width 1000mm
Height 2350mm
Depth 600(flat), 1075(double-sided)
Applied standard IEC61439-2
Seismic test National Radio Research Agency Announcement No. 2015-14