1.Low Voltage Motor Control Cente Product Overview
      Low Voltage Motor Control Centers (MCCs) are centralized distribution assemblies for managing the starting, stopping, protection, and monitoring of multiple motors. Designed and manufactured in accordance with IEC 61439-1/-2 (formerly IEC 60439), they integrate components such as circuit-breakers/fuses, contactors, overload relays, motor protection devices, control transformers, PLC/DCS interfaces, indicating instruments, and pushbuttons/indicator lamps into standardized enclosures or withdrawable units. MCCs provide safe, reliable, flexible, and easily maintainable motor control solutions, widely used in industrial sectors including petrochemical, power generation, metallurgy, water treatment, and manufacturing.

2. Low Voltage Motor Control Cente Main Functions
      Starting Control: Provides multiple starting methods: Direct-On-Line (DOL), Star-Delta (Y-Δ), Auto-transformer, Soft Starter, and Variable Frequency Drive (VFD).
      Stopping Control: Provides normal stopping and emergency stopping functions.
      Overload Protection: Detects motor overload current and initiates tripping via thermal-magnetic relays or electronic motor protection devices.
      Short-Circuit Protection: Rapidly interrupts short-circuit fault currents using circuit-breakers or fuse + contactor combinations.
      Undervoltage/No-Voltage Protection: Prevents unintended motor starting or operation during abnormal supply voltage conditions.
      Phase Failure/Unbalance Protection: Detects loss of phase or severe phase imbalance to protect the motor.
      Stall Protection: Detects locked rotor current during motor starting or operation.
      Earth Fault Protection (Optional): Detects earth fault currents in the motor or cable.
      Status Monitoring and Indication: Provides indication for Run, Stop, Fault (overload, short-circuit, etc.), and Ready/Power status.
      Remote/Local Control: Supports local pushbutton operation and communication with higher-level PLC/DCS/SCADA systems (hardwired or bus communication).
      Measurement & Metering (Optional): Measures parameters such as current, voltage, power, and energy.
      Isolation and Maintenance Safety: Provides visible isolation points via disconnectors or withdrawable units to ensure safety during maintenance.

3.Low Voltage Motor Control CenteProduct Features
      1.Standardization & Modularity: Employs standardized modular design (e.g., E=25mm increments) with flexible combination of withdrawable/fixed separated units, facilitating easy expansion and maintenance.

2.High Safety:
      Compliant with IEC 61439, certified via Type Testing.
      Comprehensive internal separation (commonly Form 2b/3b/4b) prevents fault propagation.
      Reliable interlocking mechanisms (unit position, switch status, door locks) prevent live operation.
      Effective isolation between main circuits, control circuits, and functional units.
      Robust earthing system.

3.High Reliability:
      Utilizes high-quality components from reputable brands compliant with IEC standards (circuit-breakers, contactors, protection devices).
      Strict manufacturing processes and quality management.
      Excellent interchangeability of withdrawable units for rapid fault recovery.

4.Flexibility & Extendibility:
      Supports mixed installation of units with different starting methods.
      Easy addition of new circuits or modification of existing circuits.
      Extensive range of accessories and interface options (communication, meters, heaters, lighting).

5.Ease of Operation & Maintenance:
      Clear status indication (position, run, fault).
      Units withdrawable to Test/Isolation/Disconnect positions for safe testing and maintenance.
      Ergonomic layout of door-mounted operator devices (pushbuttons, selector switches, indicators).
      Ample cable connection space and standardized wiring practices.

6.Intelligent Integration:
      Supports integration of intelligent motor protection devices and multifunction meters.
      Offers multiple communication interfaces (hardwired, Modbus RTU, Profibus DP, DeviceNet, Ethernet/IP, etc.) for remote monitoring and diagnostics.

7.Superior Protection:
      Robust enclosure construction, available with varying degrees of protection (IP20 to IP54) for different environments.
      Internal options for anti-condensation heaters, ventilation fans, etc.

8.Cost-Effectiveness:
      Centralized control saves space and installation costs.
      Modular design reduces spare parts inventory and maintenance costs.
      Intelligent features enable optimized operation and predictive maintenance, reducing energy consumption and downtime costs.

Low Voltage Motor Control Center (LV MCC) Product Parameters (Detailed)
Main Circuit:
        Rated Operational Voltage (Ue): AC 400V, 690V (50/60Hz).
        Rated Insulation Voltage (Ui): AC 690V / 1000V.
        Rated Impulse Withstand Voltage (Uimp): 8kV / 12kV (compliant with IEC 60664).
        Rated Current (Ie): Per unit configuration, typical 16A – 1250A.
        Rated Short-Time Withstand Current (Icw): 15kA, 20kA, 25kA, 35kA, 50kA (1s).
        Rated Peak Withstand Current (Ipk): ≥ Icw * n (n as per standard).
        Rated Ultimate Short-Circuit Breaking Capacity (Icu): ≥ Icw (must match main switching device parameters).
        Power-Frequency Withstand Voltage: Main circuit ≥ 2500V AC (1min), Auxiliary circuits ≥ 2000V AC (1min).

Control Circuit:
        Rated Voltage: AC 110V, 230V; DC 24V, 48V, 110V, 220V.
        Rated Current: Typically ≤ 10A.
        Power-Frequency Withstand Voltage: ≥ 2000V AC (1min).

Mechanical Parameters:
        Degree of Protection (IP Code): IP20 (standard), IP31, IP41, IP54 (optional, requires specific enclosure design).
        Material: High-quality cold-rolled steel sheet or aluminum-zinc coated steel.
        Surface Treatment: Degreasing, phosphating, electrostatic powder coating (RAL 7035 or specified).
        Mounting: Floor-mounted, fixed type (against wall/free-standing).

Environmental Parameters:
        Operating Temperature: -5°C to +40°C (standard), option for -25°C to +55°C.
        Storage Temperature: -25°C to +55°C.
        Relative Humidity: ≤ 95% (non-condensing).
        Altitude: ≤ 2000m (standard), derating required above 2000m.
        Pollution Degree: 3 (standard).
        Overvoltage Category: III / IV.
        Installation Category: III.

Construction and Safety:
        Compliant with IEC 61439-1/-2 requirements for Type-Tested Assemblies (TTA).
        Internal Separation of Forms: Form 1 / 2a / 2b / 3a / 3b / 4b (per IEC 61439-1 Annex D).
        Mechanical Operating Durability: Withdrawable unit insertion/withdrawal ≥ 500 cycles, operating mechanism ≥ 10,000 cycles.
        Clearances and Creepage Distances: Strictly compliant with IEC 60664-1.
        Earth Continuity: Main earthing busbar ensures effective earthing.

Switchgear Type Designation and Dimensions
Type Designation: Manufacturer specific (e.g., MMCC, MCCB, PMCC, SynchroStart). Core elements include: voltage level, cubicle type, functional unit type, main switching device type, degree of protection, starting method code.

Dimensions (Typical):
Width: 400mm, 600mm, 800mm, 1000mm.
Depth: 400mm, 500mm, 600mm, 800mm.
Height: 1800mm, 2000mm, 2200mm (standard cubicle); or based on modular unit combination (modular construction cubicle).
Note: Specific dimensions are determined by manufacturer design, number of units, and functionality.