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The VD4 series represents a high-performance line of medium voltage vacuum circuit breakers designed for indoor applications in power distribution systems. These breakers utilize advanced vacuum interrupter technology to ensure reliable operation under both normal and fault conditions.
With a rated voltage range spanning from 12kV to 40.5kV and current ratings from 630A up to 4000A (with forced cooling), the VD4 breakers are suitable for diverse industrial applications. The symmetrical short-circuit breaking capacity reaches up to 63kA, making them ideal for demanding electrical environments.
Key features include a separate pole construction technique, long service life expectancy, and the ability to handle frequent switching operations without vacuum degradation. The compact design combines small dimensions with high capacity, while the operating mechanism requires minimal maintenance.
Applications include:
- Cable and overhead line protection
- Transformer and distribution substations
- Motor and generator control
- Capacitor bank protection
- Industrial power distribution systems
The VD4 vacuum circuit breakers are available in both fixed and withdrawable versions, with options for embedded or assembled pole configurations. The operating mechanism includes features such as open/closed auxiliary contacts, spring charging motor, mechanical operation counter, and various signalling devices.
