Manual for VD4

Basic Operation of the VD4 Vacuum Circuit-Breaker

The VD4 vacuum circuit-breaker is designed for indoor use in air-insulated switchgear systems. It is capable of handling various switching conditions, including normal operation, fault conditions, and short-circuits.

Key Operational Aspects:

• Switching Frequency: Particularly advantageous in networks with high switching frequencies or a significant number of short-circuit breaking operations.
• Auto-reclosing: Suitable for auto-reclosing sequences, offering high operating reliability and a long service life.
• Structure: Available in fixed installation units or mounted on chassis, typically in a column form.
• Operating Mechanism: Utilizes a stored-energy spring mechanism, which can be charged manually or automatically via a charging motor.
• Control: Operation can be initiated via mechanical ON/OFF push-buttons or through electrical control units.
• Safety Features: Includes various releases (shunt, undervoltage, indirect overcurrent) and blocking magnets for protection and safe operation.
• Maintenance: Designed for low maintenance, with the vacuum interrupters being maintenance-free during their working life. Regular inspection and servicing are recommended based on operating cycles and environmental factors.