Outdoor high-voltage AC vacuum circuit breakers are a type of switchgear used in outdoor high-voltage AC power systems. They are mainly employed to cut off and connect the load current, overload current and short-circuit current in high-voltage circuits, ensuring the safe and stable operation of power systems. So, do you know what the performance advantages of outdoor high-voltage AC vacuum circuit breakers are?

Performance Advantages of Outdoor High-Voltage AC Vacuum Circuit Breakers:
Strong Arc-extinguishing Capacity: In a high-vacuum environment, the arc-extinguishing capability of vacuum circuit breakers is far superior to that of other types of circuit breakers. They can quickly and reliably cut off large currents, especially in cases of high short-circuit currents, and ensure that the arc extinguishes within a short period of time, significantly enhancing the safety and stability of the power system.
Long Service Life: Due to the relatively small wear of contacts during arc-extinguishing, the mechanical and electrical service lives of vacuum circuit breakers are relatively long. Generally, the mechanical service life can reach tens of thousands of times, and the electrical service life can also meet the requirements for long-term operation, reducing the frequency of equipment maintenance and replacement, and lowering operating costs.
Simple Maintenance: Compared with other types of circuit breakers, vacuum circuit breakers have a relatively simple structure, with fewer internal components, and the arc-extinguishing chamber does not require complex maintenance and repair. Daily maintenance mainly focuses on the inspection and cleaning of the operating mechanism, the visual inspection of the insulation part, etc. The maintenance workload is small, and the maintenance cost is low.
Small Size and Light Weight: The arc-extinguishing chamber of vacuum circuit breakers is compact in size, and the overall structure is compact, reducing the equipment’s floor space and weight. This is particularly advantageous for outdoor installation and layout, especially in some complex terrains or limited spaces, where its advantages are more evident.
No Explosion Hazard: Due to the use of vacuum as the arc-extinguishing medium, there is no flammable and explosive medium like in oil circuit breakers, greatly reducing the explosion risk during operation and improving the safety of the power system. It is especially suitable for densely populated areas and places with high safety requirements.

When the outdoor high-voltage AC vacuum circuit breaker system is in a normal operating state, the circuit breaker is in the closed position, allowing current to pass smoothly through the contacts and ensuring the normal power supply of the power system. When a fault occurs in the system (such as overload, short circuit, etc.), the relay protection device will send out a signal. After the operating mechanism receives the signal, it will release the energy storage (for spring operating mechanism) or apply electricity to generate electromagnetic force (for electromagnetic operating mechanism), driving the moving contact and the static contact of the circuit breaker to separate rapidly at the instant of contact separation, generating an arc at that moment.