Electrical circuit breaker with two vacuum switch tubes in series

摘要

Inside a sealed enclosure (10) filled with sulphur hexafluoride are housed main contacts (17, 19) and in parallel with the latter, an auxiliary circuit comprising two vacuum switch tubes (20, 21) connected electrically in series. The switch tubes (20, 21) are controlled by the same mechanism so that they open and close simultaneously and the series connection allows an increase in the voltage holding. IMAGE