ZN63(VS1)-12 Indoor High Voltage Vacuum Circuit Breaker

TOONICE’s the full name of the VS1 vacuum circuit breaker is VS1-type indoor high-voltage vacuum circuit breaker. It serves as the core equipment for “power control and fault protection” in 10kV/35kV medium-voltage power distribution systems. Its core advantage lies in the vacuum arc-extinguishing technology, featuring “oil-free and pollution-free operation, strong arc-extinguishing capability, long service life, and easy maintenance”. It has been widely replacing traditional oil-immersed circuit breakers and has become the “mainstream choice” for medium-voltage power distribution in fields such as industry, power grids, and new energy.

I.Core Features

1. Efficient Arc Extinguishing with No Safety Hazards:

① Arc-extinguishing principle: When opening, the arc generated by contact separation is quickly extinguished in the “high-vacuum interrupter chamber” (vacuum degree ≥ 10⁻⁴Pa) —— The vacuum environment lacks conductive media, so arc energy diffuses rapidly, and the arc-extinguishing time is ≤ 0.01 second (only 1 power grid cycle). Moreover, there is no oil, gas, or open flame during the arc-extinguishing process, completely eliminating the safety hazards of “oil spray and fire” in oil-immersed circuit breakers and “gas leakage” in SF₆ circuit breakers.

② Strong short-circuit breaking capacity: It can reliably interrupt the rated short-circuit breaking current (e.g., 25kA/31.5kA/40kA for the 10kV class) and handle the most severe short-circuit faults in medium-voltage systems (such as three-phase short circuits), ensuring the safety of the power distribution system.

2. Long-life Design with a Long Maintenance-free Period:

① Electrical life: Contact wear in the vacuum interrupter chamber is extremely small (no oxidative corrosion occurs in the vacuum environment). The number of rated short-circuit breaking operations can reach 30–50 times, and the number of rated load current breaking operations exceeds 10,000 times —— 3–5 times that of oil-immersed circuit breakers.

② Mechanical life: Adopting a spring operating mechanism, the opening and closing mechanical actions are reliable. The mechanical life can reach 10,000–30,000 times (far exceeding the 5,000 times of oil-immersed circuit breakers). Under normal operation, the maintenance-free period lasts up to 10–15 years, greatly reducing operation and maintenance costs.

3. Modular Structure with Strong Adaptability:

① Mainstream adoption of the “solid-sealed pole” design: The vacuum interrupter chamber, static contacts, and insulating supports are integrally cast in epoxy resin to form a sealed pole unit, completely isolating moisture, dust, and dirt. The insulation performance is more stable (the creepage distance meets the requirement of ≥125mm for the 10kV class), making it especially suitable for humid and dusty industrial environments (such as power plants and chemical plants).

② Standardized dimensions: The height and width of the main body are compatible with mainstream medium-voltage switchgear (e.g., KYN28, XGN2). It can be directly installed as a “removable handcart” or “fixed unit” without custom modification, reducing equipment matching costs.

4. Intelligent Control, Adaptable to Automation Systems

① Supports “electric operation + remote control”: Equipped with a motor energy storage spring operating mechanism, it can send opening and closing commands via PLC and SCADA systems to achieve unattended operation (such as in substation automation systems).

② Condition monitoring function: Some high-end models have built-in “vacuum degree monitoring sensors” and “contact wear sensors” to collect data (e.g., vacuum degree of the interrupter chamber, contact thickness) in real time. The data is uploaded to the monitoring platform via RS485/Ethernet to warn of faults in advance (such as vacuum degree drop, excessive contact wear), avoiding sudden tripping.

II. Technical characteristics

III. Structural Composition

IV. Typical Application Scenarios:

1. Main Circuits of Medium-Voltage Distribution Networks:

In substations and switching stations of urban 10kV distribution networks, VS1 vacuum circuit breakers serve as “incoming line circuit breakers” and “outgoing line main circuit breakers”, responsible for interrupting short-circuit faults in main circuits and ensuring the stability of the entire power grid (for example, in an urban 110kV/10kV substation, a VS1 circuit breaker with a breaking current of 40kA acts as the main protection for 10kV outgoing lines).

2. Protection of High-Voltage Loads in Industry:

Large factories (such as steel plants and chemical plants) have high-voltage motors (10kV water pumps, fans) and high-voltage transformers (10kV/0.4kV main transformers). VS1 circuit breakers are needed as “power switches” —— they can not only connect and disconnect normal load currents but also quickly interrupt currents when motors short-circuit or transformers fail, avoiding equipment damage (for example, a 10kV rolling mill motor in a certain steel plant is equipped with a VS1 circuit breaker with a breaking current of 31.5kA).

3. New Energy Grid-Connection Systems:

In 10kV/35kV grid-connected cabinets of centralized photovoltaic (PV) power stations and wind farms, VS1 vacuum circuit breakers act as “grid-connected main switches”, responsible for “grid-connected closing” and “fault disconnection” —— when grid faults occur (such as voltage sag), they quickly interrupt grid-connected currents to protect PV inverters and wind turbine converters (for example, a 200MW PV power station uses a VS1 circuit breaker with 1250A/31.5kA as the 10kV grid-connected switch).

4. Power Distribution for Important Public Facilities:

Medium-voltage power distribution systems in hospitals, data centers, and subways (such as subway 10kV traction substations and the high-voltage side of 10kV UPS in data centers) require VS1 circuit breakers to ensure “zero-interruption power supply” —— their high reliability (annual failure rate ≤ 0.05 times) and rapid fault interruption capability can reduce power outage time and prevent medical equipment downtime and server crashes.