Siemens VSG-12/1250A vacuum circuit breaker
VSG-12/1250A
Indoor Medium Voltage Vacuum Circuit Breaker
Siemens AG
Product Overview
The Siemens VSG-12/1250A is an indoor medium voltage vacuum circuit breaker designed for use in AC systems up to 12kV. It provides reliable protection and control in various industrial and utility applications, offering high performance, safety, and durability.
This circuit breaker features a vacuum interrupter encapsulated in an epoxy resin insulation housing, providing excellent insulation properties and protection against environmental factors. The VSG-12/1250A is suitable for both fixed and withdrawable applications, making it versatile for different switchgear configurations.
Technical Specifications
| Parameter | Value | Unit |
|---|---|---|
| Rated Voltage | 12 | kV |
| Rated Current | 1250 | A |
| Rated Frequency | 50 | Hz |
| Rated Short-Circuit Breaking Current | 25 / 31.5 / 40 | kA |
| Rated Short-Time Withstand Current (4s) | 25 / 31.5 / 40 | kA |
| Rated Peak Withstand Current | 63 / 80 / 100 | kA |
| Mechanical Life | 20,000 | Operations |
| Electrical Life (Rated Current) | 10,000 | Operations |
| Opening Time (Rated Voltage) | ≤ 30 | ms |
| Closing Time (Rated Voltage) | ≤ 60 | ms |
| Contact Resistance | ≤ 40 | μΩ |
| Operating Temperature Range | -25 to +55 | °C |
| Storage Temperature Range | -40 to +70 | °C |
| Humidity | ≤ 95% | RH |
| Altitude | ≤ 2000 | m |
Key Features
- Vacuum interrupter technology for reliable arc extinction
- Epoxy resin encapsulated insulation for enhanced protection
- Spring energy storage mechanism for quick and consistent operation
- Compact design suitable for both fixed and withdrawable applications
- High short-circuit breaking capacity
- Long electrical and mechanical life
- Low maintenance requirements
- Compliance with international standards (IEC 62271-100)
Applications
The VSG-12/1250A circuit breaker is suitable for a wide range of applications, including:
- Industrial power distribution systems
- Utility substations
- Renewable energy installations (solar and wind farms)
- Commercial buildings
- Mining and petrochemical facilities
- Railway power supply systems
Dimensions
Typical Dimensions (mm)
| Dimension | Value (mm) |
|---|---|
| Height | 550 |
| Width | 360 |
| Depth | 650 |
| Weight (approx.) | 65 kg |
Standards Compliance
The VSG-12/1250A complies with the following international standards:
- IEC 62271-100 - High-voltage switchgear and controlgear - Part 100: Circuit-breakers
- IEC 60694 - Common specifications for high-voltage switchgear and controlgear assemblies
- IEC 60068 - Environmental testing for electrical and electronic products
- ISO 9001 - Quality management systems
- ISO 14001 - Environmental management systems
Ordering Information
When ordering the VSG-12/1250A circuit breaker, please specify the following details:
- Product code: VSG-12/1250A
- Required rated short-circuit breaking current (25kA, 31.5kA, or 40kA)
- Mounting type (fixed or withdrawable)
- Optional accessories (e.g., auxiliary contacts, shunt trip, undervoltage release)
- Special requirements (e.g., extended temperature range, specific certifications)
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