ABB has released its latest series of VD4 vacuum circuit-breakers for medium voltage primary distribution with a range of new and enhanced features.
The breakers use vacuum interrupters embedded in resin poles, which makes the circuit-breaker poles sturdy and protects the interrupter against shocks and dielectric strength limitation from accumulated dust and humidity. The poles are now sealed, which makes them resilient in all climatic conditions.
The vacuum interrupter housing for the contacts is simple, having few parts and low maintenance. This makes the circuit breakers reliable and gives them long life.
Also new is the VD4's mechanical operating mechanism, with stored energy, free release and anti-pumping device as standard. These features allow the circuit breakers to open and close independently of the operator.
The mechanical operating mechanism is simple to use and is offered with a wide range of accessories that can be quickly and easily installed.
The VD4 comes in two versions. The fixed version has the operating mechanism and poles fixed to a compact metal frame. It is sturdy and mechanically reliable. The withdrawable version features a truck for racking into and out of the switchboard or enclosure with the door closed.
The VD4 also features a built-in spring charging lever, key lock and padlocks and protective covering for the pushbuttons.
All units comply with the IEC 62271-100, CEI 17-1 file 1375 standards and with those of all major industrialised countries.