The VS1 vacuum interrupter is a crucial component widely used in medium-voltage electrical equipment, playing an essential role in supporting safe and efficient power distribution. As industries grow more dependent on continuous and stable electrical supply, the reliability of switching devices becomes increasingly important. This article provides an in-depth review of the VS1 interrupter, how it works, where it is used, and why manufacturers like Degatech Electric continue to adopt it for modern switchgear systems.

1. Introduction to the VS1 Vacuum Interrupter

A vacuum interrupter is designed to break electrical circuits under load and fault conditions. The VS1 model, known for its compact structure and high endurance, is typically used in 12–24kV switchgear systems. It is the core arc-extinguishing component inside VS1 vacuum circuit breakers (commonly labeled ZN63 VCBs).

The interrupter ensures that power systems can manage normal switching operations and respond safely to short-circuit events. Thanks to its exceptional dielectric recovery characteristics, it can interrupt current rapidly without producing harmful gases or requiring ongoing maintenance.

2. Internal Design and Arc-Extinguishing Mechanism

The VS1 vacuum interrupter consists of several precision-engineered elements:

  • Sealed vacuum bottle made from high-strength ceramic

  • Movable and fixed CuCr contacts

  • Flexible metallic bellows for smooth contact movement

  • Steel shielding cylinder to protect the internal walls

  • Support structure and terminals

When the contacts part, a metal vapor arc forms. However, the vacuum environment causes the arc plasma to extinguish rapidly as electron and ion movement dissipates. Compared with air or gas-insulated interrupters, vacuum interrupters provide cleaner, faster, and safer arc interruption.

3. Key Advantages of the VS1 Vacuum Interrupter

The VS1 unit is widely recognized for several high-value attributes:

• Exceptional Electrical Endurance

It can handle thousands of on-off cycles, making it ideal for locations requiring frequent operation such as industrial plants.

• Fast Dielectric Recovery

The VS1 interrupter restores insulation strength almost instantly after current zero-crossing, reducing the risk of restrikes.

• Environmentally Sustainable

No SF₆ or other greenhouse gases are used. This aligns closely with modern energy policies and with manufacturers like Degatech Electric that prioritize eco-friendly switchgear development.

• High Short-Circuit Breaking Ability

VS1 interrupters are tested according to IEC standards and can interrupt high fault currents without significant contact erosion.

• Stable Performance in Harsh Environments

They are resistant to humidity, dust, pollution, and temperature fluctuations.

4. Applications Across Power Distribution Networks

The VS1 interrupter is widely used in:

  • Indoor medium-voltage switchgear

  • Withdrawable and fixed-type vacuum circuit breakers

  • Power grid substations

  • Utility distribution transformers

  • Renewable energy projects

  • Smart grid systems

  • Industrial automation and heavy manufacturing

Its adaptability makes it a key component in modernizing electrical networks and replacing outdated technologies like oil circuit breakers.

5. Why Manufacturers Choose the VS1 Vacuum Interrupter

The VS1 interrupter offers a strong combination of reliability, environmental friendliness, long service life, and cost-effectiveness. For manufacturers such as Degatech Electric, it supports the development of medium-voltage switchgear that is compact, efficient, and capable of meeting global quality standards.

As global demand for safe and green power distribution continues to rise, the VS1 vacuum interrupter will remain central to the development of advanced, eco-friendly power equipment.