SCHNEIDER M9F21105 Vacuum circuit breakers

Description

SCHNEIDER M9F21105 Vacuum circuit breakers

Schneider Electric is a global leader in Medium Voltage (MV) switchgear, primarily represented by the EasyPact EXE, HVX, and Evolis ranges. These Vacuum Circuit Breakers (VCB) use vacuum interrupters to extinguish the electrical arc, making them highly reliable for high-voltage applications.

Product Detailed Description

A Schneider VCB is an electromechanical device designed to connect and disconnect electrical circuits under normal or fault conditions (short circuits). The “Vacuum” technology refers to the interruption chamber where the contacts reside in a high-vacuum environment ($< 10^{-7}$ mbar). This allows for an extremely small contact gap and rapid quenching of the arc, preventing damage to the system.

Core Technical Parameters

Parameters vary across the EasyPact and HVX series:

Product Advantages

• Maintenance-Free Interrupters: The vacuum bottles are hermetically sealed, requiring zero maintenance throughout their lifespan.

• Environmental Friendliness: Unlike $SF_6$ gas breakers, VCBs do not use potent greenhouse gases for interruption, making them a “greener” choice.

• Compact Footprint: High dielectric strength of vacuum allows for a very small distance between contacts, leading to smaller switchgear dimensions.

• High Safety Standards: Designed with comprehensive mechanical interlocking to prevent accidental operation or contact with live parts.

• Fast Interruption: Capable of clearing faults within 3 cycles, minimizing stress on downstream transformers and cables.

Important Considerations (Precautions)

• Vacuum Integrity: While rare, if a vacuum leak occurs, the breaker loses its insulating properties. Periodic “Hi-Pot” (high-potential) testing is recommended to ensure vacuum levels are sufficient.

• Switching Overvoltages: In some applications (like switching dry-type transformers or motors), VCBs can cause “current chopping,” leading to voltage spikes. Surge Arresters or RC Snubbers are often required.

• Phase-to-Phase Clearance: Ensure that the installation cabinet (switchgear) meets the minimum air clearance distances specified in the Schneider technical manual to prevent flashovers.

• Lubrication: While the vacuum bottle is maintenance-free, the external mechanical linkage and spring mechanism require periodic lubrication (typically every 5-10 years).

Product Applications

Schneider VCBs are the backbone of medium-voltage distribution:

• Industrial Plants: Protecting large motors, furnaces, and main incoming power lines in steel, cement, and mining industries.

• Utility Substations: Primary protection for power distribution networks and transformer feeders.

• Data Centers & Hospitals: Ensuring “always-on” power with high-speed fault isolation for critical infrastructure.

• Renewable Energy: Used in wind farm and solar plant substations to manage grid connection and protection.

Shipping Port: Xiamen, China

Payment: Bank of Chicago, Bank of Singapore

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