What is the difference between VS 1- 12 vacuum circuit breaker and VBM- 12 vacuum circuit breaker?

VSI- 12 is a circuit breaker for interrupting current in 10kV power grid, and its main operating mechanism is spring operating mechanism.

VBM- 12 is a permanent magnet mechanism circuit breaker, which is used to break the current in 10kV power grid. It is actually another form of VS 1.

VS 1 and ZN63 can be considered as products of the same grade;

ZN85 and VS 1 are different products. The circuit breaker of ZN85 is mainly used in 35kV power grid, and its overall size and structure are quite different from those of VS 1.