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3 Sensors 3.1 Arc sensor VA 1 DA
V121/EN M/A017
9
3.
Sensors
3.1.
Arc sensor VA 1 DA
The arc sensor is a light sensitive element, which is activated by
strong light. Arc sensors should be mounted in the switch-gear
cubicles, in such a way that the light sensitive part (see Figure
3.1-2) covers the protected area as completely as possible.
Figure 3.1-1. Arc sensor VA 1 DA
Figure 3.1-2. The sensitivity of the VA1DA arc sensor to light from different
directions.
In open spaces, such as the bus bar section, arc sensors should
be mounted max. four meters apart.
The light sensitivity of the arc sensor is 8000 LUX
The arc sensor can be mounted from the outside on partition wall
of the switchgear. The active part of the sensor is mounted in a 10
mm hole, to the area in the switchgear that should be protected,
and fastened with a 4 mm self-tapping screw (see Figure 3.1-3).