The AMVAC is truly the next generation in medium voltage vacuum technology. 

With the AMVAC, ABB is the first to combine

the unique requirements of vacuum interrupter technology to a

stored energy mechanism designed to exploit these capabilities.

Using a flux-shifting device with integral permanent magnets,

the AMVAC mechanism has just seven moving parts. Having

only an open/close actuator, an electronic controller, and capacitors for energy storage, the AMVAC circuit breaker mechanism

is capable of 50,000 to 100,000 operations. Vacuum interrupters are embedded in a proprietary epoxy material, achieving

excellent dielectric and thermal capabilities. Eliminating mechanism operated cell switches, the AMVAC breaker packages all

auxiliary control contacts on the circuit breaker. These are just a

few of the features that mark a departure from the conventional

stored energy breaker and introduce new capabilities and benefits for the modern power systems.