DISCONNECTING SWITCH
Operation & Maintenance Manual
04
3.1.2 - Position of the Switch Blades
The moving contact consists of two coupled blades which can
swing over to either sides to mate with the LOSE/EARTH
contacts. The CLOSE contacts are mounted on independent
resin cast insulators. The contacts are made of drawn copper
conductors. Earth contacts are connected to the cubicle
framework.
In the CLOSE operation, the blades connect the breaker to the
busbar.
Whilst in OPEN operation, the blades are isolated from the
breaker and earth.
For EARTH operation, the moving contacts connect breaker to
the earth contacts mounted on the disconnect switch frame.
Figure 3.1.2 b - DS in CLOSE Position
Figure 3.1.2 c - DS in EARTH Position
Figure 3.1.2 a - DS Assembly in OPEN Position
