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VSD-12GD Indoor Three-position Solid-sealed Vacuum Circuit Breaker
1. Product Overview
The VSD-12GD is a newly developed integrated three-position solid insulated vacuum circuit breaker specially designed for KYN28-12 withdrawable switchgear.
This innovative product integrates the functions of:
Disconnector / Isolation Switch
Earthing Switch
into one compact unit, fully replacing the traditional combination solution of:
VS1 Vacuum Circuit Breaker
GN30 Isolation Switch
JN15 Earthing Switch
The breaker adopts APG epoxy resin solid insulated poles combined with a modular spring operating mechanism, featuring compact structure, complete mechanical interlocking system, reliable operation, maintenance-free performance, and strong environmental adaptability.
It is an ideal solution for modern 12kV compact and high-reliability medium-voltage distribution systems.
2. Model Description
| Model Code | Meaning |
|---|---|
| VSD | Integrated Three-Position Vacuum Switch |
| 12 | Rated Voltage: 12kV |
| G | Solid Insulated Pole |
| D | Withdrawable Type with Spring Operating Mechanism |
3. Main Technical Parameters
| Item | Technical Data |
|---|---|
| Rated Voltage | 12kV |
| Rated Current | 630A / 1250A |
| Rated Short-Circuit Breaking Current | 25kA / 31.5kA |
| 4s Rated Short-Time Withstand Current | 25kA / 31.5kA |
| Operating Mechanism | Motor Spring Charging + Manual Emergency Operation |
| Control Voltage | Standard DC220V, Optional DC110V |
| Mechanical Life | ≥30,000 Operations |
| Applicable Switchgear | KYN28-12 MV Switchgear (Compatible with 450mm Narrow Cabinet) |
| Insulation Type | APG Solid Insulated Epoxy Pole |
4. Three-Position Structure & Safety Interlocking
The VSD-12GD is equipped with three independent interlocked operating positions to ensure maximum operational safety:
ON Position
The main circuit is connected for normal power transmission.
ISOLATED Position
Visible isolation gap for maintenance and physical disconnection.
EARTHED Position
The main circuit is reliably grounded to ensure personnel safety during maintenance.
The breaker is equipped with a complete mechanical interlocking system (Five Prevention Interlock) to effectively prevent dangerous misoperations such as:
Closing onto the earthing position
Earthing on a live circuit
Incorrect operational sequence
ensuring maximum operational safety and reliability.
5. Product Advantages
Integrated Compact Design
Three functions integrated into one unit, replacing multiple conventional devices, reducing cabinet space and minimizing failure points.
Excellent Insulation Performance
Solid insulated poles provide superior resistance to dust, humidity, condensation, and pollution, suitable for harsh environments.
Reduced Installation Time & Cost
Easy installation with minimal on-site adjustment, significantly shortening project commissioning time.
High Reliability & Maintenance-Free
Stable mechanical performance, long service life, and low maintenance cost.
Flexible Customization
Supports customized control voltages, including DC110V and DC220V, to meet various power supply standards.
6. Application Areas
Widely used in 12kV indoor medium-voltage distribution systems, including:
Power substations
Industrial plants
Mining enterprises
Commercial buildings
Municipal infrastructure
Factory distribution systems
Renewable energy projects
Suitable for various indoor power transmission and distribution applications requiring compact structure, high safety, and reliable operation.
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