Product Description

VD4 Indoor Drawable Vacuum Circuit Breaker

Description

VD4 series medium voltage vacuum circuit-breakers with lateral operating mechanism feature the separate pole construction technique.

The operating mechanism is the EL trip-free stored energy type with independent opening and closing regardless of the operator's action. The EL operating mechanism is widely used in all VD4 series circuit-breakers with frontal control.

The circuit-breaker can be remote controlled when fitted with dedicated electrical accessories (gearmotor, opening and closing release).

The operating mechanism, the three poles and the current sensors (if installed) are assembled on a metal frame without wheels. The construction is extremely compact, strongly built and low in weight. 

VD4 series circuit-breakers with lateral operating mechanisms are life-long sealed pressure devices (Standards IEC 62271-100 and CEI EN 62271-100). 

Additionally, VD4 series circuit-breakers have been type tested for low temperature and marine applications (Germanischer Lloyd).

VD4 vacuum circuit breakers have been designed for indoor use and air insulated switchboards.
 
Advantages

Vacuum circuit-breakers have particular advantages for use in networks where there is a high switching frequency in the working current range and/ or where a certain number of short- circuit breaking operations are expected. VD4 vacuum circuit- breakers are suitable for auto reclosing and have exceptionally high operating reliability and long life. The circuit- breakers are notable for their compact design, small dimensions together with high capacity. The operating mechanisms have a low maintenance requirement and the interrupters are maintenance- free throughout their service lives. They are well suited to all load breaking operations which occur in practice, and in particular:

• Short-circuit currents;
• Overhead lines under load and, no-load conditions;
• Cables under load and no-load conditions;
• Transformers under load and no-load conditions;
• Generators under load and no-load conditions;
• Ripple control system;
• Capacitor banks(also parallel switching) and Motors with starting currents above 600A;

 
Fields of application

Below is the list of SM6 range units used in MV/LV transformer substations and industrial distribution substations:

• Cable control and protection
• Overhead control and protection
• Transformers and distribution substations
• Motor and transformer control and protection
• Generator control and protection
• Capacitor bank control and protection

 
Diagrammatic sketch



Circuit-breaker operating mechanismMain characteristics