Siemens 3AH3 Operating Instructions Manual page 31

Fig. 42 Heater (71.)
Siemens Parts
9229 9860 176 0E
2013-08-22
Heater (condensation water protection)
Electrical manual closing/electr. locking device
In the basic version, the vacuum circuit-breaker with on-site connection is closed by
direct mechanical unlatching of the closing spring. Instead of this mechanical man-
ual closing, "electrical manual closing" is also available.
In this version, the closing circuit of the vacuum circuit-breaker module is electrically
actuated by a sensing device and must also be enabled via a command element
from the control room.
With on-site closing, this permits taking into account system-related interlocking and
allows you to prevent unintentional closing by the control room, for example. This
allows for interlocking the vacuum circuit-breaker module, for example, via the aux-
iliary contact of a disconnector.
Vacuum circuit-breakers with electrical manual closing cannot
mechanically.
The heater limits condensation and corrosion of the vac-
uum circuit-breaker.
To this end, the heater has to be connected to the sup-
ply voltage (see circuit diagram included with the deliv-
ery).
The heater's surface temperature is at the most 180 °C.
Power consumption 50 W
Description
be switched
31