What is typically not a characteristic of a vacuum interrupter?

A vacuum interrupter is designed to operate in a vacuum environment, which significantly reduces the chances of arcing when contacts are opened and closed. This lack of arcing is a defining feature, as it enhances the device's performance and longevity. Vacuum interrupters are known for their excellent insulation properties, which are due to the absence of gas or air in the contacts. Therefore, the potential for arcing is typically very low, making this choice inconsistent with the recognized characteristics of vacuum interrupters.

In contrast, low maintenance, compact size, and high reliability are all common advantages of vacuum interrupters. They generally require less maintenance due to the absence of physical arcing that can wear out contacts, their compact design allows for easier integration into switchgear systems, and their high reliability stems from their robust construction and proven performance in various applications.