VMH Vacuum Medium Voltage Switchgear0 pages
Our VMH switchgear is of the fl ush fronted, metalclad
type with air insulated busbars and a horizontally
isolated, withdrawable vacuum circuit breaker.
Developed after the introduction of the type VMV Vacuum
Switchgear, this unit offers the alternative horizontally
isolated vacuum circuit breakers but in addition, provides
options for an enhanced fault rating (31.5kA) and internal
arc protection.
The fi xed housing is segregated into three
compartments - the busbar chamber, circuit breaker
chamber and a chamber enclosing the cable terminations,
various current and voltage transformers when
required, and a circuit earth switch.
VMH
Vacuum Medium Voltage Switchgear
Key Features
» Integral Fault making Cable Earth
» High Reliability
» Minimal maintenance
» Proven Service experience
» Fully Interlocked
» Front & Rear Cabling Access
» Metalclad Construction
» Absence of fi re risk
» Pressure relief fl aps
Rated Voltage kV 12
Rated Impulse Withstand kV 75/95
Rated Frequency Hz 50
Symmetrical Breaking Current kA Up to 31.5
Rated Short-Time Current kA 3secs Up to 31.5
Rated Peak Making Current kApk Up to 80
Current Ratings A 630/1250/2000
Busbar Ratings A Up to 2000
Degree of Protection in Service IP4X
RATINGS
your power in safe hands
HAWKER SIDDELEY SWITCHGEAR