Siemens brings world’s first 4000 ampere vacuum circuit breaker for frequent-operation

Siemens brings world’s first 4000 ampere vacuum circuit breaker for frequent-operation applications without forced cooling onto the market Siemens is meeting the steel industry’s growing demand for every higher performance levels in melting down scrap metal by launching a refined medium-voltage circuit-breaker. As of September 2009, the company offers 3AH4 vacuum circuit-breakers with an operating […]