Siemens has launched a refined medium-voltage circuit-breaker. The 3AH4 vacuum circuit-breakers have an operating current of 4000 A for the 36-kV voltage level. It is the first vacuum circuit-breaker ...

Today’s announcement represents the first solid-state circuit breaker fully developed by Siemens in the United States. These devices are designed for use in 120-volt, single pole residential ...