Siemens 3AH4, Operating Instructions Manual

Page: 29 / 66

Description
9229 9862 176 0D 29
2013-08-28
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
manual 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
auxiliary contact of a disconnector.
Vacuum circuit-breakers with electrical manual closing cannot be switched
mechanically.
The heater limits condensation and corrosion of the
vacuum circuit-breaker.
To this end, the heater has to be connected to the supply
voltage (see circuit diagram included with the delivery).
The heater's surface temperature is at the most 180 °C.
Power consumption 50 W
Fig. 38 Heater (71.)