3KC ATC6300 transfer control device
Manual, 03/2018, L1V30535632002A-01
13
Applications
3
The following chapter contains information on:
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Transfer control
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Controlling the switching devices
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Voltage control
3.1
Transfer control
Fundamental information on the topic of transfer control is provided below.
In accordance with IEC 60947-6-1 we differentiate between two classes of transfer switching
equipment:
Class PC:
Motorized switching devices are required for this application. These can make short-circuit
currents and conduct them to a limited extent (1 sec. current), but cannot break them. In
connection with the remotely operated Siemens 3KC3 or 3KC4 transfer switching equipment,
a user-defined transfer can be realized according to class PC.
Class CB:
The transfer in this case is performed by means of circuit breakers with motor operators.
These can make and conduct short-circuit currents, and also break them in the event of an
overload. The ATC6300 functions as class CB transfer switching equipment in connection
with two Siemens 3VA or 3VL molded case circuit breakers with motor operators, and in
connection with two 3WL or 3WT air circuit breakers.
3.1.1
Network/network application
In the network/network application the load is normally connected to the main supply source
and is switched to the secondary supply source if an anomaly occurs in the main supply or if
an external signal is issued. By means of various setting options (interlock time, etc.) the
transfer behavior can be defined on a customer-specific basis.
You can find more information on this in the chapter Parameterization (Page 115).