At what altitude do you need to use the plateau type VS1 vacuum circuit breaker?

To understand the difference between VS1 plateau vacuum circuit breakers and ordinary VS1 circuit breakers, and what kind of VS1 circuit breakers are called plateau circuit breakers, we first need to understand what altitude is and what altitude is considered a plateau.

Definition of altitude

Altitude, also known as absolute altitude, refers to the height difference between a place and sea level. It is usually calculated based on the mean sea level, which indicates the vertical distance of a certain place above sea level. The starting point of the altitude is called the zero point or level zero, which is based on the average water surface position recorded by tide gauges for many years at a coastal location.

What altitude is considered a plateau?

Areas with higher altitudes on the earth's surface or in the atmosphere are called high altitude areas. High altitudes are sometimes defined as areas with an altitude of 2,400 meters (8,000 feet) and above. Although this data is commonly used, it is not an absolute standard.