MCC Panels

MCC Panel

MCC stands for motor control center. It consists of feeders for motors and blowers. Feeders are designed according to the motor rating. In most of the MCCs, auto/manual provision will be there. With manual provision motors can be operated manually. In auto provision external signal is required to start the motor. The signal is given by the control panel. Indicators for the motor operation also will be present in control panel. A motor control center (MCC) is an assembly of one or more enclosed sections having a common power bus and principally containing motor control units. Motor control centers are in modern practice a factory assembly of several motor starters. A motor control center can include variable frequency drives, programmable controllers, and metering and may also be the electrical service entrance for the building.


RST-MCC “Motor Control Center” switchboards are designed for use in power distribution and particulary for the control and protection of electrical motors. The different versions and the ideal use of the structure make these switchboards perfectly adaptable to any application and offer the degree of protection that is best suited to the installation’s operational and environmental conditions. The metal casting is made in a standardized modular steel structure, completely segrergated, that can be easly expandend and comprises the following main parts:

  • Incoming line module
  • Auxiliary switchboards and feeder module
  • Motor starter and feeder module
  • Compartment for horizontal main bars
  • Compartment for vertical distribution bars
  • Compartment for interpanel connection auxiliary circuits
  • Compartment for power cables
  • Compartements for withdravable module
  • Protection against fire is insured by the use of self-extinguishing insulating materials and internal metal plates.

Fixed interlocks for each single module are:

  • Mechanical interlock that prevents the opening of a live module
  • Electrical lock that activates contact-breaker at the start of switch operation
  • Padlocks to be inserted into switch handle
  • In addiction for Withdrawable modules

Interlock that prevents withdrawal of live module


Rated Voltage up toV660
Rated FrequencyHz50/60
Rated insulating voltage up toV1000
Rated Current on main bus bars up toA2500
Maximum short-term rated current (1 sec.) up tokA100
Maximum peak current up tokA230
Internal Arc Withstanding current IAC-FLR (0,5 sec)kA70

** Internal arc withstanding in option


  • Ease of use
  • Reliability
  • Robustness
  • Up to IP54
  • Seismic withstand


1. Electrical data
Features Value
Short-circuit current (max) Up to 70 KA – 1s
Main bus bar rating Up to 3200A
Vertical bus bar Up to1000A
IS333 Withdrawable drawer up to 1000A AC1
Rated impulse withstand voltage (Uimp) 8 kV
Rated insulation voltage (Ui) 1000V
Voltage rating (Ue) 690V
Rated frequency (F) 50/60Hz
  2. Mechanical data
Features Value
Service index IS 333
Form 3b, 4a, 4b
Protection index IP31 / IP42 IP54 on demand
Access Front Top and bottom cable entry


  • IEC 61439-2
  • IEC 60529


Switchboards can be supplied in the following versions:

  • Front access to all compartments and modules. Its reduced size makes it suitable for fitting in particularly small areas.
  • Double-fronted switchboards are avaiable on request.
  • Front access for motor starter modules and rear access for cable and unboltable bar compartements. Withdrawable modules version with front access to all compartments and modules. Its takes-up little space and offers easy maintenance, double-fronted switchboards are available in this version
  • For indoor installations, normal degree of protection:
    • IP 30 on outside case
    • IP 20 with open door.
  • Protection up to IP54 is available for particularly polluted environments with presence of dust and liquids.
  • For special environments and temperatures

Standardized fixed and withdrawable modules:

  • Statoric direct starters (normal start)
  • Statoric direct starters (heavy start)
  • Reversible starters
  • Star/delta starters
  • Double-speed starters
  • Static starters
  • Variable frequency Inverter
  • Line protection (feeders)
  • Modules, control compartments and auxiliary circuits are designed in accordance to specific customer/installation requirements. switchboards are designed to be easly combined with “Power
  • Center” for incoming and outgoing


RST-MCC complies with the International standards, and in particular with:
IEC 61439-1
IEC 61439-2
IEC 61641
all switchboards have passed the relevant tests carried out by qualified Laboratories