BECKHOFF CX50x0 - Manual (Page 8)

Validation
4 CX50x0 units in potentially explosive areas
1.3 Validation
This documentation is valid for all CX50x0 units, which bear one of the following markings
II 3 G Ex nA IIC T4 Gc DEKRA 12ATEX0025 X Ta: 0 - 55°C
and which product code is built as follows:
CX50x0-01yz
The letter x can be a number from 1 to 2. The letter y is a number 0 to 2 and z is a number from 0 to 2.
Updated lists of the certified components may be found at the Beckhoff homepage under
http://www.beckhoff.de/english/certifications/epc.htm