The Promoda 6.6 kV Vacuum Circuit Breaker (VCB) Switchgear Panel is a high-performance medium voltage switchgear system designed for industrial power distribution networks, heavy electrical loads, and process plant substations.
Engineered using a modular metal-clad air-insulated switchgear architecture, the panel integrates a withdrawable vacuum circuit breaker that ensures reliable switching, fault interruption, and system protection within 6.6 kV distribution systems. The design follows a system-house engineering philosophy compatible with Siemens vacuum switching technology, ensuring long-term reliability and standardized maintenance practices.
This switchgear is widely used in large industrial motor feeders, manufacturing plants, and captive power distribution systems where operational continuity and equipment protection are critical. The withdrawable breaker truck allows the circuit breaker to be safely moved between service, test, and isolated positions, enabling inspection and testing without interrupting connected cabling.
Constructed using precision-fabricated sheet steel enclosures and high-conductivity copper busbars, the switchgear provides excellent mechanical strength and electrical insulation performance. Vacuum interrupter technology ensures rapid arc extinction, minimal contact wear, and long operating life compared to conventional switching technologies.
The panel complies with IEC 62271-200 for metal-enclosed switchgear and IEC 62271-100 for vacuum circuit breakers, making it suitable for demanding industrial environments where safety, reliability, and maintainability are essential.
Key Highlights
Optimized for Industrial Distribution
Designed specifically for 6.6 kV medium voltage networks used in industrial power systems and large motor applications.
Withdrawable Breaker Mechanism
Allows the vacuum circuit breaker to move safely between service, test, and isolated positions.
Robust Metal-Clad Construction
Fully compartmentalized panel design improves safety, electrical isolation, and service accessibility.
Vacuum Interruption Technology
Provides reliable arc extinction, minimal maintenance, and extended electrical life.
IEC Standard Compliance
Manufactured according to IEC 62271-200 and IEC 62271-100 standards for medium voltage switchgear.
High Switching Endurance
Capable of handling frequent switching operations typical in industrial feeder and motor circuits.
Panel Architecture
The switchgear panel incorporates a multi-compartment structure designed to improve operational safety and maintenance accessibility.
- Circuit Breaker Compartment
Contains the withdrawable vacuum circuit breaker installed on a racking trolley mechanism. - Busbar Compartment
Houses insulated copper busbars designed to handle high load currents with excellent thermal stability. - Cable Compartment
Provides adequate termination space for incoming and outgoing power cables. - Low Voltage Compartment
Accommodates protection relays, control wiring, metering instruments, and auxiliary control devices.
Major Components
- Vacuum Circuit Breaker
Ensures rapid and reliable interruption of fault currents. - Withdrawable Breaker Truck
Allows movement between service, test, and isolated positions. - Copper Busbar System
Designed for high conductivity and excellent mechanical strength. - Automatic Safety Shutters
Provide isolation from live contacts when the breaker is withdrawn. - Mechanical Interlocking System
Prevents unsafe switching and ensures sequential operation.
Materials and Finish
- Heavy-duty sheet steel enclosure
- Electrostatic powder-coated corrosion-resistant finish
- Silver-plated electrical contacts for improved conductivity
- High-grade insulation materials for reliable operation
| Parameter | Specification |
|---|---|
| Voltage Range | 3.3 kV – 33 kV |
| Rated Current | Up to 3150 A |
| Short Circuit Breaking Capacity | Up to 40 kA |
| Short Time Withstand Current | Up to 40 kA for 3 seconds |
| Circuit Breaker Type | Withdrawable Vacuum Circuit Breaker |
| Internal Arc Classification | AFL / AFLR as per IEC 62271-200 |
| Operating Mechanism | Stored Energy Spring Mechanism |
| Panel Construction | Metal-clad, compartmentalized switchgear |
| Ingress Protection | IP42 / IP54 |
| Panel Height | Approx. 2200 mm |
| Control Wiring | FRLS copper wiring, ferruled and numbered |
| Applicable Standards | IEC 62271-100, IEC 62271-200 |
Enhanced Safety and System Protection
- Metal-clad enclosure separating high-voltage components into dedicated compartments
- Automatic safety shutters isolating energized contacts when the breaker is withdrawn
- Mechanical and electrical interlocks preventing unsafe switching sequences
- Internal arc classification available to protect operators and equipment
- Independent compartments for breaker, busbars, cables, and control devices
High-Performance Vacuum Switching
- Advanced vacuum interrupters with long operational life
- Minimal arc energy resulting in reduced contact wear
- Fast dielectric recovery after current interruption
- Reliable switching for both normal and fault conditions
- Ideal for heavy motor starting and frequent switching operations
Operational and Maintenance Benefits
- Withdrawable breaker truck simplifies maintenance and testing
- Front-operated design improves accessibility for operators
- Modular switchgear structure enables future panel expansion
- Standardized engineering compatible with system-house designs
- Thermally optimized layout for improved heat dissipation
Compared to SF₆ Gas Switchgear
- No greenhouse gas emissions
- Eliminates gas leakage and pressure monitoring
- Simplified maintenance procedures
- Environmentally sustainable switching technology
Compared to Oil Circuit Breakers
- No risk of oil fire or leakage
- Higher switching reliability
- Reduced servicing requirements
- Extended operational lifespan
Compared to Fixed Breaker Panels
- Withdrawable breaker allows offline testing
- Reduced maintenance downtime
- Improved operator safety
- Easier inspection and servicing
Key Industry Sectors
- Steel and metallurgical industries
- Cement manufacturing plants
- Oil and petrochemical processing facilities
- Power generation auxiliary systems
- Heavy industrial manufacturing units
Common Installations
- Industrial medium voltage distribution systems
- Large motor feeder protection panels
- Captive power plant substations
- Transformer feeder protection systems
- Industrial electrical substations
