In the industrial field in particular, there are applications that require high to very high switching sequences. Switching in arc furnaces, for example, demands more than 100 switching sequences per day. This requires sturdy, powerful vacuum circuit breakers that can manage these tough demands – like the vacuum circuit breakers in our 3AH4 series.
The compact vacuum circuit breakers in the 3AH4 series are designed for up to 40.5 kV, and can handle up to 120,000 switching sequences. With minimal maintenance required – greasing the drives after 10,000 switching sequences and changing the vacuum tubes after 30,000 – these circuit breakers stay reliable throughout their entire service life, despite the tough mechanical demands they face. An extensive range of accessory options like remote access means the vacuum circuit breakers are flexible to use and operate.