The new generation of circuit breakers, such as the ADVAC breaker with a torroidal spring, were

designed specifically for use with vacuum technology.

Each generation reflects the best technology available at the

time of their introduction, building on the strengths of previous designs, yet adding new innovations, marking true turning points.

Although it is well established that vacuum interrupters are

capable of more than 10,000 operations, conventional stored

energy circuit breakers seldom operate beyond 10,000 operations without teardown,

re-lubrication, and/or replacement of parts.

More than 100 parts are required to perform spring charging, closing, anti-pumping and tripping functions.

Conventional stored energy breakers also place limitations on the types of control voltages allowed. 

Vacuum interrupters were mounted in

open moldings, making them susceptible to dust, moisture, and corrosive atmospheres.