Motor Control Center

Motor Control Center

Motor Control Center are offered upto 1600 A operational current at 40 degree Celsius ambient Temperature in single and double front design for 50 kA short Circuit Withstand Capacity and IP: 52 degree of Protection. Form IV of separation as per IS: 8623 is maintained. Types of starters include Automatic Star Delta, Direct On-line, Soft Starters, Variable Frequency Drives, Stator Rotor Starters and AutoTransformer Starters.

Technical specification
Constructional Features
Compartmentalised Design
Cable Alley
Busbar System

Rated Service Voltage	: 415 V
Rated Frequency	: 50 Hz
Rated Insulation Voltage	: 660 V
Rated Current (maximum)	: 4000 A
Busbar Fault Level	: 50 kA withstand (for 1 sec) 105 kA (Peak)
Busbar SYSTEM	: TP-E or TPN-E
Degree of Protection	: IP 54 AS PER IS 2147

Fully Compartmentalised :
Separate chambers for :
Busbar Droppers
Auxiliary busbars
Unit compartments
Cables
Versions :
Single front
Double front
Overall Dimensions (mm) :

	S.F	D.F
Width	800	800
Height	2430	2430
Depth	644	944

Fully drawout module with five distinct positions

Service :	Power & Control contacts engaged .
Test :	Control circuits can be tested. Power contacts disconnected.
Isolated :	Both power and control contacts disengaged .
Maintenance :	Can be withdrawn for routine maintenance.
Hinged out :	All-round access to all components without removing the module.

Silver plated drawout Contacts :
All the drawout power, control and earthing contacts are of silver plated copper. They offer high resistance to abrasion, lower mV drop, leading to lower wear and tear and longer life of the contacts.

Programmable Secondary Isolating Contacts
Depending on logic requirements, programmed contacts are used to permit selective signals during service, test position or to operate in both service and test positions.

Cable alley

•	The MCC is provided with large cabling area. The cable chamber width exceeds 250 mm. Aluminium cables can therefore be easily accommodated and terminated.
•	Both top or bottom cable entry possible.
•	The wide cable alley makes bending and termination of aluminium cables easy.

Module Design

•	Module size : Module size ranges from 100mm to 1300mm in steps of 100mm .
•	100 mm Module can accomodate : Switchfuse feeders upto 63A and DOL Starters upto 11 kW
•	Spring Loaded position lock
•	Variety of Feeders DOL starter upto 168 kW Switchfuse upto 800 A ACB upto 1600 A

Auxiliary Busbars
Upto 13 auxiliary busbars can be
accommodated in the auxiliary busbar
chamber.

Telescopic Rails & Racking Screw Offer

•	Positive guidance
•	Smooth movement of the module
•	Perfect alignment of contacts
•	They eliminate the need to remove the module for routine checks / minor modifications.
•	All identical drawout units are fully interchangeable thus minimising downtime.

Facility for Padlocking

•	Module in service and test position
•	Power switches

Control Plate

Indicating lamps, push buttons, meters and selector switches are mounted on a control plate.This plate can be hinged out for inspection / maintenance of the connections. Only the control plate needs to be changed in case of change in specified control equipment.
Separate silver plated contact plates are used on the droppers - the incoming side of the feeders. This avoids need for replacement of entire dropper in case of welding of contacts on fault. But retainer plates at the joints make checking tightness of the busbar joints easy.

Completely Insulated Busbar System

Busbars and droppers are provided with heat shrunk PVC sleeving.The heat curing process ensures no voids or pinholes. Except at the tap-offs and stab-in contact plates, the busbars are completely covered with insulating material. Sleeving also protects busbars against accidental contacts with hardware, tools and vermin.
'Click-fit' joint shrouds are provided to cover tap-offs and fish-plate joints. Thus short circuits between phase and neutral or earth is virtually eliminated in the bus zone. The heat shrunk PVC sleeving is provided in addition to the large clearances in the busbar zone.

Merits

•	Secondary insulation protects against accidental contact with hardware, tools and vermin.
•	Restricts the arc, in case of a fault, to the zone of initiation.

Busbar Supports :
The busbar supports are moulded from fibre glass reinforced thermosetiing plastic. This material has higher mechanical strength compared to conventional support material. Ribbed construction of moulded supports prevents tracking caused by dust accumulation.

Safety Shutters

Spring loaded safety shutters block access to the stab-in power contacts when the module is withdrawn from the service position.

Scraping Earth System :
Operator's safety is ensured by :

•	Distinct vertical earth bar of full length for each panel front.
•	Silver plated scraping earth contact on each drawout module of 'Make-first' and 'Break-last' type.
•	All doors are individually earthed .