The ZN12-40.5 series high-voltage vacuum circuit breaker is suitable for 35kV three-phase AC 50Hz power systems. The arc-extinguishing chamber of this circuit breaker features a porcelain structure and employs longitudinal magnetic field contacts, offering a compact size. During interruption, the diffused arc current is evenly distributed across the contacts, preventing localized melting. It also exhibits low arc energy voltage (20-200V) and low chopping current (4-5A), and is equipped with a highly reliable operating mechanism.
This circuit breaker uses a DYT-1 spring energy storage mechanism, which can be operated with AC energy storage, DC operation, or manual operation. It employs special contact materials, resulting in a high interrupting capacity for the arc-extinguishing chamber and a long electrical lifespan.
With its simple structure, strong interrupting capability, long service life, comprehensive operating functions, no risk of explosion, and easy maintenance, this circuit breaker is suitable for control or protection switches in power distribution systems such as power plants and substations. It is particularly ideal for applications involving heavy load interruption and frequent operations.