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The VD4 series medium voltage vacuum circuit breakers feature advanced separate pole construction technology, designed specifically for indoor use in air insulated switchboards. These robust breakers provide reliable switching capacity for both normal operating conditions and fault situations, including short-circuit protection.
Available in both fixed and withdrawable versions, the VD4 breakers offer exceptional performance characteristics. The vacuum interrupters ensure maintenance-free operation throughout the product lifecycle, even with frequent switching operations. The compact design combines small dimensions with high capacity, making them ideal for space-constrained installations.
Key applications include cable and overhead line protection, transformer and distribution substations, motor control, generator protection, and capacitor bank switching. The breakers are particularly suitable for networks requiring high switching frequency in the working current range.
The operating mechanism features multiple safety and monitoring components including open/closed auxiliary contacts, mechanical operation counter, spring charging indicators, and service releases. The design ensures high operational reliability and long service life.
With their simple yet robust construction, VD4 vacuum circuit breakers provide reliable protection for various electrical systems. The vacuum technology eliminates the need for arc-extinguishing medium replacement and maintains consistent performance over time.
