The Promoda 33 kV Vacuum Circuit Breaker (VCB) Switchgear Panel is a high-capacity medium voltage switchgear solution designed for primary substations, utility distribution systems, and large industrial power networks. Built using a metal-clad air-insulated switchgear architecture, the panel provides dependable switching performance, system protection, and operational safety for high-voltage distribution environments.
The switchgear incorporates a withdrawable vacuum circuit breaker mounted on a racking trolley mechanism, allowing the breaker to move between service, test, and isolated positions. This configuration simplifies maintenance procedures while maintaining high operational safety for personnel working within energized switchgear installations.
Designed for 33 kV medium voltage systems, the panel is widely used in power utilities, heavy industrial plants, and infrastructure electrical networks where high power transfer and fault interruption capabilities are essential. The compartmentalized panel architecture isolates critical components such as circuit breakers, busbars, and cable terminations into independent sections, improving system reliability and reducing the risk of internal faults.
The switchgear is manufactured using precision sheet-steel fabrication, insulated copper busbars, and high-performance vacuum interrupters capable of interrupting high fault currents. Vacuum interruption technology provides fast arc extinction, minimal contact wear, and extended mechanical and electrical endurance compared to conventional switching technologies.
The Promoda 33 kV VCB switchgear panel is designed in compliance with IEC 62271-200 for metal-enclosed switchgear and IEC 62271-100 for vacuum circuit breakers, ensuring safe and reliable performance in modern power distribution networks.
Key Highlights
High Voltage Distribution Capability
Designed specifically for 33 kV medium voltage power distribution and substation networks.
Withdrawable Breaker Mechanism
Breaker truck allows safe movement between service, test, and isolated positions.
Reliable Fault Interruption
Vacuum circuit breaker technology enables rapid interruption of high fault currents.
Metal-Clad Safety Design
Fully compartmentalized panel construction enhances operator safety.
IEC Standard Engineering
Manufactured according to IEC 62271-200 and IEC 62271-100 standards.
Long Operational Life
Vacuum interrupters provide minimal maintenance and long electrical endurance.
Panel Architecture
The switchgear panel incorporates a metal-clad compartmentalized design that enhances safety and maintenance accessibility.
- Circuit Breaker Compartment
Contains the withdrawable vacuum circuit breaker mounted on a racking trolley. - Busbar Compartment
Houses insulated copper busbars designed for high current carrying capacity. - Cable Compartment
Provides space for termination of incoming and outgoing medium voltage cables. - Low Voltage Compartment
Contains protection relays, control wiring, metering instruments, and auxiliary equipment.
Major Components
- Vacuum Circuit Breaker
High-performance interrupter designed for reliable fault current interruption. - Withdrawable Breaker Truck
Allows movement between service, test, and isolated positions. - Copper Busbar System
High conductivity busbars ensuring stable current distribution. - Automatic Safety Shutters
Metal shutters isolate energized contacts when the breaker is withdrawn. - Mechanical Interlocking System
Prevents incorrect switching operations.
Materials and Finish
- Heavy gauge sheet-steel enclosure
- Powder-coated corrosion resistant finish
- Silver-plated electrical contacts
- High-quality insulation materials for long-term electrical reliability
| 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 |
Safety and Operational Reliability
- Metal-clad enclosure providing complete segregation of internal compartments
- Automatic metallic shutters isolating live contacts during breaker withdrawal
- Mechanical and electrical interlocks preventing unsafe switching operations
- Internal arc classification available for enhanced operator protection
- Independent compartments for breaker, busbars, cables, and control circuits
Vacuum Switching Technology
- Maintenance-free vacuum interrupters
- Long electrical and mechanical life
- High switching endurance for heavy load operations
- Stable arc interruption performance
- Suitable for industrial and utility power systems
Design Advantages
- Withdrawable breaker truck enabling safe inspection and servicing
- Front-operated panel design for easy operation
- Expandable switchgear lineup for future network extensions
- Standardized modular construction compatible with system-house switchgear
- Optimized layout for improved insulation and heat dissipation
Compared to SF₆ Gas Switchgear
- No greenhouse gas emissions
- No gas pressure monitoring requirements
- Reduced environmental impact
- Simplified maintenance procedures
Compared to Oil Circuit Breakers
- No oil leakage or fire hazard
- Higher switching reliability
- Lower maintenance requirements
- Extended equipment life
Compared to Fixed Breaker Panels
- Withdrawable breaker simplifies inspection and servicing
- Testing possible without disconnecting power cables
- Reduced downtime during maintenance
- Improved operational safety
Key Industry Sectors
- Power generation and transmission utilities
- Large industrial manufacturing facilities
- Steel and heavy engineering plants
- Oil and petrochemical processing industries
- Infrastructure and utility substations
Common Installations
- Primary electrical substations
- Industrial power distribution networks
- Utility distribution switchgear rooms
- Transformer feeder switching panels
- High-capacity industrial feeder systems
