The VB12 indoor vacuum circuit breaker is suitable for 35KV three-phase AC 50HZ power systems. The arc extinguishing chamber of this circuit breaker is made of ceramic structure and adopts longitudinal magnetic field contacts. It has a small volume, and the diffusion arc current generated during disconnection is uniformly distributed on the contacts, without local melting phenomenon. It also has low arc energy voltage (20-200V) and low current cutoff value (4-5A), and is equipped with a highly reliable operating mechanism.

This circuit breaker adopts a spring energy storage mechanism, which can be operated by AC energy storage or DC, or manually. This circuit breaker uses special contact materials, which make the arc extinguishing chamber have high breaking capacity and long service life. This circuit breaker has a simple structure, strong breaking capacity, long service life, complete operating functions without explosion hazards, and simple maintenance. It is suitable for controlling or protecting switches in power plants, substations and other distribution systems, especially for breaking heavy loads and frequent operations.  

Main technical parameters of VB12-40.5 indoor high-voltage vacuum circuit breaker

Appearance and installation dimensions