Comparison of vacuum, solid-sealed, and permanent-magnet circuit breakers

The three types of circuit breakers mentioned by the original poster are generally not classified in this way, as vacuum circuit breakers can be of the hermetically sealed type and equipped with permanent-magnet operating mechanisms. For example: The ABB VD4 and VD4M circuit breakers are described as follows: The VD4 vacuum circuit breaker is an indoor switchgear component that can be used for frequent operations or multiple openings and closings of short-circuit currents within its operating current range ； The mechanical life can reach up to 30,000 cycles, and the number of times it can interrupt a short circuit at full capacity can reach up to 100 times. The phase posts of the VD4M type are encapsulated in epoxy resin and equipped with permanent magnet mechanisms. Circuit breakers can be classified into various types based on the arc extinguishing medium, such as vacuum, SF6, oil, and compressed air; they can also be categorized by their operating mechanism, which may be electromagnetic, hydraulic, spring-driven, or permanent magnet-based. Vacuum circuit breakers are being widely adopted in complete power distribution systems for 10kV and 35kV systems. Vacuum circuit breakers hold a dominant position in China’s medium-voltage sector. The annual production volume of 12KV circuit breakers exceeds 200,000 units (accounting for about 50% of the world’s total production), which represents 98.85% of China’s total 12KV circuit breaker output, giving them an absolute advantage ； There are approximately 30,000 units of 40.5KV vacuum circuit breakers, accounting for 61.49% of the 35KV circuit breakers; they complement SF6 circuit breakers and share a similar market share.