The complete arrangement comprises a SICROWBAR DC overvoltage protection and de-excitation/discharge resistor.

The following device parameters that are used to select the device must be determined:

1.  The firing voltage – if this is reached, then the thyristors of the SICROWBAR DC are turned on.

2.  The maximum current that flows or the maximum I²t value that occurs.

Detailed information about configuration, applicable standards and connection of the overvoltage protection are provided in the operating instructions or on the Internet at:

• For units 7VV3003-5...:
  http://support.automation.siemens.com/WW/view/en/21696826
• For units 7VV3003-6...:
  http://support.automation.siemens.com/WW/view/en/86152590

Typical load current characteristic
7VV3003-5...:	7VV3003-6...:
Cooling time
7VV3003-5...:	7VV3003-6...: